diff --git a/src/api/call-forwarding.js b/src/api/call-forwarding.js
index d0836dfb..6abe9550 100644
--- a/src/api/call-forwarding.js
+++ b/src/api/call-forwarding.js
@@ -162,41 +162,23 @@ export async function cfDeleteTimeSet (timesetId) {
 	})
 }
 
-export async function cfCreateTimeSetDateRange (subscriberId, date) {
+export async function cfCreateTimeSetDateRange (subscriberId, times) {
 	return post({
 		resource: 'cftimesets',
 		body: {
 			subscriber_id: subscriberId,
 			name: 'csc-date-range-' + v4(),
-			times: [
-				{
-					minute: null,
-					month: date.from.month + '-' + date.to.month,
-					hour: null,
-					mday: date.from.date + '-' + date.to.date,
-					year: date.from.year + '-' + date.to.year,
-					wday: null
-				}
-			]
+			times: times
 		}
 	})
 }
 
-export async function cfUpdateTimeSetDateRange (timeSetId, date) {
+export async function cfUpdateTimeSetDateRange (timeSetId, times) {
 	return patchReplace({
 		resource: 'cftimesets',
 		resourceId: timeSetId,
 		fieldPath: 'times',
-		value: [
-			{
-				minute: null,
-				month: date.from.month + '-' + date.to.month,
-				hour: null,
-				mday: date.from.date + '-' + date.to.date,
-				year: date.from.year + '-' + date.to.year,
-				wday: null
-			}
-		]
+		value: times
 	})
 }
 
diff --git a/src/components/call-forwarding/CscCfGroupConditionDateRange.vue b/src/components/call-forwarding/CscCfGroupConditionDateRange.vue
index 910115db..d33fa9db 100644
--- a/src/components/call-forwarding/CscCfGroupConditionDateRange.vue
+++ b/src/components/call-forwarding/CscCfGroupConditionDateRange.vue
@@ -6,14 +6,32 @@
 		v-bind="$attrs"
 		v-on="$listeners"
 	>
-		<q-date
-			v-model="selectedDate"
-			class="no-margin no-padding"
-			flat
-			square
-			minimal
-			range
-		/>
+		<template
+			v-if="invalidDateset"
+		>
+			<q-banner
+				rounded
+				dense
+				class="bg-red-8 text-white q-pt-md q-ma-md half-screen-width"
+			>
+				<template v-slot:avatar>
+					<q-icon name="date_range" />
+				</template>
+				{{ $t('The "{timeset}" timeset contains incompatible values. You can resolve this by deleting it and recreating from the scratch.', { timeset: timeSet.name }) }}
+			</q-banner>
+		</template>
+		<template
+			v-else
+		>
+			<q-date
+				v-model="selectedDate"
+				class="no-margin no-padding"
+				flat
+				square
+				minimal
+				range
+			/>
+		</template>
 		<template
 			v-slot:actions
 		>
@@ -26,6 +44,7 @@
 				@click="deleteSourceSetEvent"
 			/>
 			<q-btn
+				v-if="!invalidDateset"
 				:label="$t('Save')"
 				flat
 				color="primary"
@@ -39,7 +58,7 @@
 <script>
 import CscCfGroupCondition from 'components/call-forwarding/CscCfGroupCondition'
 import { mapActions } from 'vuex'
-import { timeSetDateRange } from 'src/filters/time-set'
+import { humanDatesetToKamailio, kamailioDatesetToHuman } from 'src/helpers/kamailio-timesets-converter'
 export default {
 	name: 'CscCfGroupConditionDateRange',
 	components: {
@@ -69,30 +88,12 @@ export default {
 	},
 	data () {
 		return {
-			selectedDate: this.transformedDate
-		}
-	},
-	computed: {
-		formattedDate () {
-			if (this.timeSet) {
-				return timeSetDateRange(this.timeSet.times)
-			}
-			return null
-		},
-		transformedDate () {
-			if (this.timeSet) {
-				const dateRangeParts = timeSetDateRange(this.timeSet.times).split('-')
-				return {
-					from: dateRangeParts[0],
-					to: dateRangeParts[1]
-				}
-			} else {
-				return null
-			}
+			invalidDateset: false,
+			selectedDate: null
 		}
 	},
 	mounted () {
-		this.selectedDate = this.transformedDate
+		this.transformDateset()
 	},
 	methods: {
 		...mapActions('callForwarding', [
@@ -100,23 +101,32 @@ export default {
 			'updateTimeSetDateRange',
 			'deleteTimeSet'
 		]),
+		transformDateset () {
+			if (this.timeSet) {
+				let hDateset
+				try {
+					hDateset = kamailioDatesetToHuman(this.timeSet.times)
+				} catch (e) {
+					this.invalidDateset = true
+					console.info(e)
+					return
+				}
+				if (hDateset.length === 0) {
+					this.selectedDate = null
+				} else {
+					this.selectedDate = (hDateset[0].from === hDateset[0].to) ? hDateset[0].from : hDateset[0]
+				}
+			} else {
+				this.selectedDate = null
+			}
+		},
 		async createTimeSetEvent () {
-			const datePartsFrom = this.selectedDate.from.split('/')
-			const datePartsTo = this.selectedDate.to.split('/')
+			const dateFrom = this.selectedDate.from ? this.selectedDate.from : this.selectedDate
+			const dateTo = this.selectedDate.to ? this.selectedDate.to : this.selectedDate
+			const kamilioTimesets = humanDatesetToKamailio([{ from: dateFrom, to: dateTo }])
 			const payload = {
 				mapping: this.mapping,
-				date: {
-					from: {
-						date: datePartsFrom[2],
-						month: datePartsFrom[1],
-						year: datePartsFrom[0]
-					},
-					to: {
-						date: datePartsTo[2],
-						month: datePartsTo[1],
-						year: datePartsTo[0]
-					}
-				}
+				date: kamilioTimesets
 			}
 			if (this.timeSet) {
 				payload.id = this.timeSet.id
diff --git a/src/components/call-forwarding/CscCfGroupConditionOfficeHours.vue b/src/components/call-forwarding/CscCfGroupConditionOfficeHours.vue
index 6479b49b..34a683ea 100644
--- a/src/components/call-forwarding/CscCfGroupConditionOfficeHours.vue
+++ b/src/components/call-forwarding/CscCfGroupConditionOfficeHours.vue
@@ -467,8 +467,6 @@ export default {
 </script>
 
 <style lang="stylus" rel="stylesheet/stylus" scoped>
-	.half-screen-width
-		width 50vw
 
 	.time-range-list-height
 		// NOTE: 65vh is a default max-height for q-dialog. Other magic numbers are sum of another elements heights, like headers, buttons etc
diff --git a/src/css/app.styl b/src/css/app.styl
index f216e03d..19672113 100644
--- a/src/css/app.styl
+++ b/src/css/app.styl
@@ -33,3 +33,6 @@ body.body--dark
 		background-color $item-stripe-color
 	> :nth-of-type(2n)
 		background-color alpha($main-menu-background, 0.2)
+
+.half-screen-width
+	width 50vw
diff --git a/src/filters/time-set.js b/src/filters/time-set.js
index 42bc7063..99658c94 100644
--- a/src/filters/time-set.js
+++ b/src/filters/time-set.js
@@ -1,6 +1,6 @@
 
 import { i18n } from 'boot/i18n'
-import { getKamailioRangeElements } from 'src/helpers/kamailio-timesets-converter'
+import { getKamailioRangeElements, kamailioDatesetToHuman } from 'src/helpers/kamailio-timesets-converter'
 
 export const DAY_MAP = [2, 3, 4, 5, 6, 7, 1]
 export const DEFAULT_WEEKDAYS = [
@@ -39,11 +39,14 @@ export function timeSetDateExact (times) {
 }
 
 export function timeSetDateRange (times) {
-	const years = times[0].year.split('-')
-	const months = times[0].month.split('-')
-	const dates = times[0].mday.split('-')
-	return years[0] + '/' + months[0] + '/' + dates[0] + '-' +
-		years[1] + '/' + months[1] + '/' + dates[1]
+	try {
+		const hDateset = kamailioDatesetToHuman(times)
+		return (hDateset.length === 0)
+			? i18n.t('empty')
+			: hDateset.map(d => (d.from === d.to) ? d.from : d.from + '-' + d.to).join(', ')
+	} catch (e) {
+		return i18n.t('data error')
+	}
 }
 
 export function timeSetWeekdays (times) {
diff --git a/src/helpers/kamailio-timesets-converter.js b/src/helpers/kamailio-timesets-converter.js
index 29a9b9e6..b48513ae 100644
--- a/src/helpers/kamailio-timesets-converter.js
+++ b/src/helpers/kamailio-timesets-converter.js
@@ -31,6 +31,10 @@ kamailioTimeset = [{
 ]
 */
 
+function getAsTrimmedString (data) {
+	return (data === null || data === undefined) ? '' : String(data).trim()
+}
+
 export function getTimeStrElements (timeStr) {
 	const [hours, minutes] = timeStr.split(':').map(t => Number(t))
 	return { hours, minutes }
@@ -168,7 +172,7 @@ export function humanTimesetToKamailio (hTimeset = []) {
 		return result
 	})
 
-	const kamailioTimeset = kamailioTimesetRaw.reduce((acc, item) => {
+	let kamailioTimeset = kamailioTimesetRaw.reduce((acc, item) => {
 		const optimizedItemRanges = item.map(item => {
 			// if minute or hour contains range like "a-a" convert to just "a"
 			if (item.hour) {
@@ -186,25 +190,44 @@ export function humanTimesetToKamailio (hTimeset = []) {
 		// similar to flatMap
 		return [...acc, ...optimizedItemRanges]
 	}, [])
-		.reduce((acc, item) => {
-			// combine the same time ranges by "wday"
-			if (acc.length === 0) {
+	kamailioTimeset = kamailioTimeset.reduce((acc, item) => {
+		// combine the same time ranges by "wday"
+		if (acc.length === 0) {
+			acc.push(item)
+		} else {
+			const mergeCandidate = acc.find(accItem =>
+				accItem.minute === item.minute &&
+				accItem.hour === item.hour &&
+				getKamailioRangeElements(accItem.wday)[0].to + 1 === getKamailioRangeElements(item.wday)[0].from
+			)
+			if (mergeCandidate) {
+				const mergeCandidateWday = getKamailioRangeElements(mergeCandidate.wday)[0]
+				mergeCandidate.wday = `${mergeCandidateWday.from}-${mergeCandidateWday.to + 1}`
+			} else {
 				acc.push(item)
+			}
+		}
+		return acc
+	}, [])
+	kamailioTimeset = kamailioTimeset.reduce((acc, item) => {
+		// combine the same time ranges by "hour"
+		if (acc.length === 0) {
+			acc.push(item)
+		} else {
+			const mergeCandidate = acc.find(accItem =>
+				accItem.minute === item.minute &&
+				getKamailioRangeElements(accItem.hour)[0].to + 1 === getKamailioRangeElements(item.hour)[0].from &&
+				accItem.wday === item.wday
+			)
+			if (mergeCandidate) {
+				const mergeCandidateHour = getKamailioRangeElements(mergeCandidate.hour)[0]
+				mergeCandidate.hour = `${mergeCandidateHour.from}-${mergeCandidateHour.to + 1}`
 			} else {
-				const mergeCandidate = acc.find(accItem =>
-					accItem.hour === item.hour &&
-					accItem.minute === item.minute &&
-					getKamailioRangeElements(accItem.wday)[0].to + 1 === getKamailioRangeElements(item.wday)[0].from
-				)
-				if (mergeCandidate) {
-					const mergeCandidateWday = getKamailioRangeElements(mergeCandidate.wday)[0]
-					mergeCandidate.wday = `${mergeCandidateWday.from}-${mergeCandidateWday.to + 1}`
-				} else {
-					acc.push(item)
-				}
+				acc.push(item)
 			}
-			return acc
-		}, [])
+		}
+		return acc
+	}, [])
 
 	return kamailioTimeset
 }
@@ -270,9 +293,9 @@ export function validateKamailioRange (kamailioRangeStr = '', minValue, maxValue
 export function validateKamailioTimesets (kTimeset) {
 	kTimeset.forEach(timesetItem => {
 		let { wday, hour, minute } = timesetItem
-		wday = (wday === null || wday === undefined) ? '' : String(wday).trim()
-		hour = (hour === null || hour === undefined) ? '' : String(hour).trim()
-		minute = (minute === null || minute === undefined) ? '' : String(minute).trim()
+		wday = getAsTrimmedString(wday)
+		hour = getAsTrimmedString(hour)
+		minute = getAsTrimmedString(minute)
 		if (wday !== '') {
 			validateKamailioRange(wday, 1, 7)
 		} else {
@@ -288,7 +311,7 @@ export function validateKamailioTimesets (kTimeset) {
 		Object.entries(timesetItem)
 			.filter(([key]) => !['wday', 'hour', 'minute'].includes(key))
 			.forEach(([key, value]) => {
-				if (!(value === null || value === undefined || String(value).trim().length === 0)) {
+				if (getAsTrimmedString(value).length !== 0) {
 					throw Error(`The "${key}" scale of Kamailio timesets is not supported: ${JSON.stringify(timesetItem)}`)
 				}
 			})
@@ -301,8 +324,8 @@ export function kamailioTimesetToHuman (kTimeset = []) {
 	// convert Kamailio timeset into Human readable format
 	const hTimesetRaw = kTimeset.map(timesetItem => {
 		let { wday, hour, minute } = timesetItem
-		hour = (hour === null || hour === undefined) ? '' : String(hour).trim()
-		minute = (minute === null || minute === undefined) ? '' : String(minute).trim()
+		hour = getAsTrimmedString(hour)
+		minute = getAsTrimmedString(minute)
 
 		wday = getKamailioRangeElements(wday)[0]
 		if (hour !== '') {
@@ -316,8 +339,8 @@ export function kamailioTimesetToHuman (kTimeset = []) {
 			minute = { from: 0, to: 59 }
 		}
 
-		const nestedRules = [wday, hour, minute].reverse()
-		const rulesOutput = nestedRules.reduce((acc, range) => {
+		const nestedRules = [wday, hour, minute]
+		const rulesOutput = nestedRules.reduceRight((acc, range) => {
 			const newAcc = []
 			if (acc.length === 0) {
 				newAcc.push({ from: String(range.from), to: String(range.to + 1) })
@@ -351,5 +374,398 @@ export function kamailioTimesetToHuman (kTimeset = []) {
 	})
 		.reduce((acc, item) => [...acc, ...item], [])
 
-	return getHumanTimesetsNormalized(hTimesetRaw)
+	const res = getHumanTimesetsNormalized(hTimesetRaw)
+	return res
+}
+
+// ----  implementation for date ranges  ----
+// ------------------------------------------
+
+/*
+humanReadableDateset = [{
+  from: '2020/01/01'
+  to: '2020/12/30'
+
+  //Date format is 'YYYY/MM/DD'
+}, ...
+]
+
+kamailioDateset = [{
+    //SUPPORTED
+    year - Either given as a full 4-digit number >= 1970, or as a 2-digit number, in which case it will be understood to be within the current century.
+    month - Month of the year, either a number between 1 and 12, or at least the first 3 letters of a spelled out month name, e.g. “jan”, “janua” or “january” will all work.
+    mday - Day of the month, a number between 1 and 31.
+
+        //NOT SUPPORTED !!!
+        reversed ranges, like: "mday {15-3}"
+        complex ranges, like: "mday {1 2 5-8}"
+        Aliases: yr, mo, md, wd, hr, min,  etc
+
+        wday - Day of the week, either a number between 1 and 7, or at least the first 2 letters of a spelled out weekday name (analogous to the “month” scale). Sunday is the first day of the week.
+        hour - A number between 0 and 23. Unlike the Perl Time::Period module, “am” or “pm” specifications are not supported.
+        minute  - A number between 0 and 59.
+
+        week or wk - Week of the month, a number between 1 and 6. The first day of the week is Sunday.
+        yday or yd - Day of the year, a number between 1 and 366.
+        second or sec - A number between 0 and 60 (to allow for leap seconds).
+}, ...
+]
+*/
+
+export function getDateStrElements (dateStr) {
+	const [year, month, date] = dateStr.split('/').map(t => Number(t))
+	return { year, month, date }
+}
+
+export function isDateExist (year, month, date) {
+	const dateObj = new Date(year, month - 1, date)
+	return dateObj.getFullYear() === year && dateObj.getMonth() === (month - 1) && dateObj.getDate() === date
+}
+
+export function isDateStrValid (dateStr) {
+	if (typeof dateStr === 'string') {
+		const { year, month, date } = getDateStrElements(dateStr)
+		let isValid = year >= 1900 && year <= 2100 && month >= 1 && month <= 12 && date >= 1 && date <= 31
+		// recheck that passed date is really exist in that year
+		isValid = isValid && isDateExist(year, month, date)
+		return isValid
+	}
+	return false
+}
+
+export function dateStrToDays (dateStr) {
+	const { year, month, date } = getDateStrElements(dateStr)
+	const dateObj = new Date(year, month - 1, date)
+	const dateAsMilliseconds = dateObj.valueOf()
+	const millisecondsInOneDay = 24 * 60 * 60 * 1000
+	return Math.round(dateAsMilliseconds / millisecondsInOneDay)
+}
+
+export function validateHumanDatesets (hDateset) {
+	hDateset.forEach(datesetItem => {
+		const { from, to } = datesetItem
+		if (
+			!isDateStrValid(from) || !isDateStrValid(to)
+		) {
+			throw Error('A human dateset item has invalid format: ' + JSON.stringify(datesetItem))
+		} else if (dateStrToDays(from) > dateStrToDays(to)) {
+			throw Error('A human dateset item should have "from" date < or = "to" date: ' + JSON.stringify(datesetItem))
+		}
+	})
+}
+
+export function getHumanDatesetsNormalized (hDateset = []) {
+	// sort dateset by "from" columns
+	// clone input data to prevent original data object mutation
+	const hDatesetCloned = hDateset.map(i => ({ ...i }))
+	const hdSorted = hDatesetCloned.sort((a, b) => {
+		return dateStrToDays(a.from) - dateStrToDays(b.from)
+	})
+
+	// combine, merge periods. For example 2020/01/01-2020/10/10 and 2020/05/05-2020/11/11 should be merged into 2020/01/01-2020/11/11
+	// Important: the dateset should be sorted by "from"!
+	const hdNormalized = hdSorted.reduce((acc, currentItem) => {
+		const prevItem = acc.pop()
+		if (!prevItem) {
+			acc.push(currentItem)
+		} else {
+			const prevItemDays = { fromD: dateStrToDays(prevItem.from), toD: dateStrToDays(prevItem.to) }
+			const currentItemDays = { fromD: dateStrToDays(currentItem.from), toD: dateStrToDays(currentItem.to) }
+
+			if (prevItemDays.fromD <= currentItemDays.fromD && currentItemDays.toD <= prevItemDays.toD) {
+				// current date range is completely inside previous date range --> just skipping current dateSet item
+				acc.push(prevItem)
+			} else if ((prevItemDays.toD + 1) < currentItemDays.fromD) {
+				// current date range is not part of previous date range --> adding both as separate date ranges
+				acc.push(prevItem)
+				acc.push(currentItem)
+			} else if ((prevItemDays.toD + 1) >= currentItemDays.fromD) {
+				// current time range is the next chunk\part of the previous date range
+				// OR they are intercepting --> extending\combining previous date range with current date range
+				prevItem.to = currentItem.to
+				acc.push(prevItem)
+			} else {
+				console.info('Acc:', acc, 'prevItem:', prevItem, 'currentItem:', currentItem)
+				console.info('prevItemDays:', prevItemDays, 'currentItemDays:', currentItemDays)
+				throw Error('Internal error in "getHumanDatesetsNormalized"')
+			}
+		}
+		return acc
+	}, [])
+
+	return hdNormalized
+}
+
+export function getLastDayOfMonth (year, month) {
+	return (new Date(year, (month - 1) + 1, 0)).getDate()
+}
+
+export function humanDatesetToKamailio (hDateset = []) {
+	validateHumanDatesets(hDateset)
+
+	const hdNormalized = getHumanDatesetsNormalized(hDateset)
+	const kamailioDatesetRaw = hdNormalized.map(datesetItem => {
+		const { from, to } = datesetItem
+
+		const fromYMD = getDateStrElements(from)
+		const toYMD = getDateStrElements(to)
+
+		const result = []
+		if (fromYMD.year === toYMD.year) {
+			if (fromYMD.month === toYMD.month) {
+				if (fromYMD.date === toYMD.date) {
+					result.push({ year: fromYMD.year, month: fromYMD.month, mday: fromYMD.date })
+				} else {
+					result.push({ year: fromYMD.year, month: fromYMD.month, mday: `${fromYMD.date}-${toYMD.date}` })
+				}
+			} else {
+				if ((fromYMD.month + 1) === toYMD.month) {
+					result.push({ year: fromYMD.year, month: fromYMD.month, mday: `${fromYMD.date}-31` })
+					result.push({ year: fromYMD.year, month: toYMD.month, mday: `1-${toYMD.date}` })
+				} else {
+					result.push({ year: fromYMD.year, month: fromYMD.month, mday: `${fromYMD.date}-31` })
+					result.push({ year: fromYMD.year, month: `${fromYMD.month + 1}-${toYMD.month - 1}` })
+					result.push({ year: fromYMD.year, month: toYMD.month, mday: `1-${toYMD.date}` })
+				}
+			}
+		} else {
+			// NOTE: any other human readable date range can be represented as next set of Kamailio ranges
+			// for example "2020/02/02 - 2022/03/03" can be represented as "2020/02/02 - 2020/02/29(31)",
+			// "2020/03/01 - 2020/12/31", "2021/01/01 - 2021/12/31", "2022/01/01 - 2022/02/28(31)", "2022/03/01 - 2022/03/03"
+			// and than coded in Kamailio format
+			//    [
+			//      { year: fromYMD.year, month: fromYMD.month, mday: `${fromYMD.date}-31` },
+			//      { year: fromYMD.year, month: `${fromYMD.month + 1}-12` },
+			//      { year: `${fromYMD.year+1}-${toYMD.year-1}` },
+			//      { year: toYMD.year, month: `1-${toYMD.month - 1}` },
+			//      { year: toYMD.year, month: `${toYMD.month}`, mday: `1-${toYMD.date}` }
+			//    ]
+			// but code below will output a little more optimized version
+
+			// "Starting (month day)" range
+			if (fromYMD.date > 1) {
+				result.push({ year: fromYMD.year, month: fromYMD.month, mday: `${fromYMD.date}-31` })
+			} else fromYMD.month -= 1
+
+			// "Starting (months)" range
+			if (fromYMD.month > 0) {
+				result.push({ year: fromYMD.year, month: `${fromYMD.month + 1}-12` })
+			} else fromYMD.year -= 1
+
+			// "Middle" range
+			if (fromYMD.year + 1 <= toYMD.year - 1) {
+				result.push({ year: `${fromYMD.year + 1}-${toYMD.year - 1}` })
+			}
+
+			// "Ending (months)" range
+			if (toYMD.month > 1) {
+				result.push({ year: toYMD.year, month: `1-${toYMD.month - 1}` })
+			}
+
+			// "Ending (month day)" range
+			result.push({ year: toYMD.year, month: toYMD.month, mday: `1-${toYMD.date}` })
+		}
+		return result
+	})
+
+	let kamailioDateset = kamailioDatesetRaw.reduce((acc, item) => {
+		const optimizedItemRanges = item.map(item => {
+			// if year or month or date contains range like "a-a" convert to just "a"
+			if (typeof item.year === 'string') {
+				const [yearF, yearT] = item.year.split('-')
+				if (yearF === yearT) item.year = Number(yearF)
+			}
+
+			if (typeof item.month === 'string') {
+				const [monthF, monthT] = item.month.split('-')
+				if (monthF === monthT) item.month = Number(monthF)
+			}
+
+			if (typeof item.mday === 'string') {
+				const [mdayF, mdayT] = item.mday.split('-')
+				if (mdayF === mdayT) item.mday = Number(mdayF)
+			}
+
+			return item
+		})
+		// similar to flatMap
+		return [...acc, ...optimizedItemRanges]
+	}, [])
+	kamailioDateset = kamailioDateset.reduce((acc, item) => {
+		// Kamailio considers the date range condition "Feb 1..29" almost equal to "Feb 1..31" so we can transform days of
+		// the month like 28,29,30 into 31 if it is the last day of the month. It will help to optimize ranges better
+		// in other optimization functions
+		if (item.year && item.month && item.mday) {
+			const yearRange = getKamailioRangeElements(item.year)[0]
+			const monthRange = getKamailioRangeElements(item.month)[0]
+			const mdayRange = getKamailioRangeElements(item.mday)[0]
+			if (yearRange.from === yearRange.to && monthRange.from === monthRange.to &&
+				mdayRange.from !== mdayRange.to && [28, 29, 30].includes(mdayRange.to)) {
+				const lastDayOfMonth = getLastDayOfMonth(yearRange.from, monthRange.from)
+				if (lastDayOfMonth === mdayRange.to) {
+					// replacing "mdayRange.to" with 31.
+					item.mday = `${mdayRange.from}-31`
+				}
+			}
+		}
+		acc.push(item)
+		return acc
+	}, [])
+	kamailioDateset = kamailioDateset.reduce((acc, item) => {
+		// a rule defined as "full range" can be omitted: a {x} b {min-max} c {y} --> a {x} c {y}
+		// For example: year {2020} month {1-12} mday {1-31} --->  year {2020}
+		if (item.month) {
+			const monthRange = getKamailioRangeElements(item.month)[0]
+			if (monthRange.from === 1 && monthRange.to === 12) {
+				delete item.month
+			}
+		}
+
+		if (item.mday) {
+			const mdayRange = getKamailioRangeElements(item.mday)[0]
+			if (mdayRange.from === 1 && mdayRange.to === 31) {
+				delete item.mday
+			}
+		}
+
+		acc.push(item)
+		return acc
+	}, [])
+	kamailioDateset = kamailioDateset.reduce((acc, item) => {
+		// combine the same date ranges by "year"
+		if (acc.length === 0) {
+			acc.push(item)
+		} else {
+			const mergeCandidate = acc.find(accItem =>
+				getKamailioRangeElements(accItem.year)[0].to + 1 === getKamailioRangeElements(item.year)[0].from &&
+				accItem.month === item.month &&
+				accItem.mday === item.mday
+			)
+			if (mergeCandidate) {
+				const mergeCandidateYear = getKamailioRangeElements(mergeCandidate.year)[0]
+				mergeCandidate.year = `${mergeCandidateYear.from}-${mergeCandidateYear.to + 1}`
+			} else {
+				acc.push(item)
+			}
+		}
+		return acc
+	}, [])
+	kamailioDateset = kamailioDateset.reduce((acc, item) => {
+		// combine the same date ranges by "month"
+		if (acc.length === 0) {
+			acc.push(item)
+		} else {
+			const mergeCandidate = acc.find(accItem =>
+				accItem.year === item.year &&
+				getKamailioRangeElements(accItem.month)[0].to + 1 === getKamailioRangeElements(item.month)[0].from &&
+				accItem.mday === item.mday
+			)
+			if (mergeCandidate) {
+				const mergeCandidateMonth = getKamailioRangeElements(mergeCandidate.month)[0]
+				mergeCandidate.month = `${mergeCandidateMonth.from}-${mergeCandidateMonth.to + 1}`
+			} else {
+				acc.push(item)
+			}
+		}
+		return acc
+	}, [])
+
+	return kamailioDateset
+}
+
+export function validateKamailioDatesets (kDateset) {
+	kDateset.forEach(datesetItem => {
+		let { year, month, mday } = datesetItem
+		year = getAsTrimmedString(year)
+		month = getAsTrimmedString(month)
+		mday = getAsTrimmedString(mday)
+		if (year !== '') {
+			validateKamailioRange(year, 1900, 2100)
+		} else {
+			throw Error('A Kamailio dateset should have "year" range: ' + JSON.stringify(datesetItem))
+		}
+		if (month !== '') {
+			validateKamailioRange(month, 1, 12)
+		}
+		if (mday !== '') {
+			validateKamailioRange(mday, 1, 31)
+		}
+
+		Object.entries(datesetItem)
+			.filter(([key]) => !['year', 'month', 'mday'].includes(key))
+			.forEach(([key, value]) => {
+				if (getAsTrimmedString(value).length !== 0) {
+					throw Error(`The "${key}" scale of Kamailio datesets is not supported: ${JSON.stringify(datesetItem)}`)
+				}
+			})
+	})
+}
+
+export function kamailioDatesetToHuman (kDateset = []) {
+	validateKamailioDatesets(kDateset)
+
+	// convert Kamailio dateset into Human readable format
+	const hDatesetRaw = kDateset.map(datesetItem => {
+		let { year, month, mday } = datesetItem
+		year = getAsTrimmedString(year)
+		month = getAsTrimmedString(month)
+		mday = getAsTrimmedString(mday)
+
+		year = getKamailioRangeElements(year)[0]
+		if (month !== '') {
+			month = getKamailioRangeElements(month)[0]
+		} else {
+			month = { from: 1, to: 12 }
+		}
+		if (mday !== '') {
+			mday = getKamailioRangeElements(mday)[0]
+		} else {
+			mday = { from: 1, to: 31 }
+		}
+
+		const nestedRules = [year, month, mday]
+		const rulesOutput = nestedRules.reduceRight((acc, range) => {
+			const newAcc = []
+			if (acc.length === 0) {
+				newAcc.push({ from: String(range.from), to: String(range.to) })
+			} else {
+				for (let i = range.from; i <= range.to; i++) {
+					acc.forEach(accItem =>
+						newAcc.push({ from: [i, accItem.from].join('_'), to: [i, accItem.to].join('_') })
+					)
+				}
+			}
+			return newAcc
+		}, [])
+		const hDateset = rulesOutput.reduce((acc, ruleOutput) => {
+			const [fromYear, fromMonth, fromDate] = ruleOutput.from.split('_').map(i => Number(i))
+			const [toYear, toMonth, toDate] = ruleOutput.to.split('_').map(i => Number(i))
+
+			// if "from" date of the range is not exist (like "Feb 31")
+			// we are considering that entire range is not valid and just SKIPPING it
+			if (isDateExist(fromYear, fromMonth, fromDate)) {
+				const from = [fromYear, fromMonth, fromDate]
+					.map(i => String(i).padStart(2, '0')).join('/')
+
+				// if "to" date of the range is not exist (like "Feb 31")
+				// we are considering that the range is valid but it was optimized for creating smaller Kamailio rule
+				// so we need NORMALIZE it by using last day of the month
+				const lastDayOfMonth = getLastDayOfMonth(toYear, toMonth)
+				const to = [
+					toYear,
+					toMonth,
+					(toDate > lastDayOfMonth) ? lastDayOfMonth : toDate
+				].map(i => String(i).padStart(2, '0')).join('/')
+
+				acc.push({ from, to })
+			}
+			return acc
+		}, [])
+
+		return hDateset
+	})
+		.reduce((acc, item) => [...acc, ...item], [])
+
+	const res = getHumanDatesetsNormalized(hDatesetRaw)
+	return res
 }
diff --git a/src/i18n/de.json b/src/i18n/de.json
index b11db62a..0a337ffc 100644
--- a/src/i18n/de.json
+++ b/src/i18n/de.json
@@ -635,6 +635,7 @@
 	"call not from ...": "",
 	"callers": "Anrufer",
 	"condition": "",
+	"data error": "",
 	"date is": "",
 	"date is ...": "",
 	"date range is": "",
@@ -643,6 +644,7 @@
 	"description": "Beschreibung",
 	"disabled": "Deaktiviert",
 	"do not ring own phone": "Eigene Rufnummer klingelt nicht",
+	"empty": "",
 	"enabled": "Aktiviert",
 	"first ring": "zuerst klingeln",
 	"for": "für",
@@ -681,4 +683,4 @@
 	"{field} must have at most {maxLength} letters": "{field} darf höchstens {maxLength} Buchstaben beinhalten",
 	"{mode} of sources": "{mode} of sources",
 	"{mode} own phone": "Eigene Rufnummer {mode}"
-}
+}
\ No newline at end of file
diff --git a/src/i18n/en.json b/src/i18n/en.json
index 4bd559a5..c96dd7a2 100644
--- a/src/i18n/en.json
+++ b/src/i18n/en.json
@@ -635,6 +635,7 @@
 	"call not from ...": "call not from ...",
 	"callers": "callers",
 	"condition": "condition",
+	"data error": "data error",
 	"date is": "date is",
 	"date is ...": "date is ...",
 	"date range is": "date range is",
@@ -643,6 +644,7 @@
 	"description": "description",
 	"disabled": "disabled",
 	"do not ring own phone": "do not ring own phone",
+	"empty": "empty",
 	"enabled": "enabled",
 	"first ring": "first ring",
 	"for": "for",
@@ -681,4 +683,4 @@
 	"{field} must have at most {maxLength} letters": "{field} must have at most {maxLength} letters",
 	"{mode} of sources": "{mode} of sources",
 	"{mode} own phone": "{mode} own phone"
-}
+}
\ No newline at end of file
diff --git a/src/i18n/es.json b/src/i18n/es.json
index f420dd40..cc2be4c7 100644
--- a/src/i18n/es.json
+++ b/src/i18n/es.json
@@ -635,6 +635,7 @@
 	"call not from ...": "",
 	"callers": "llamantes",
 	"condition": "",
+	"data error": "",
 	"date is": "",
 	"date is ...": "",
 	"date range is": "",
@@ -643,6 +644,7 @@
 	"description": "descripción",
 	"disabled": "desactivado",
 	"do not ring own phone": "no hacer sonar el teléfono propio",
+	"empty": "",
 	"enabled": "activado",
 	"first ring": "primero llama",
 	"for": "por",
@@ -681,4 +683,4 @@
 	"{field} must have at most {maxLength} letters": "{field} debe tener como máximo {maxLength} letras",
 	"{mode} of sources": "{mode} de fuentes",
 	"{mode} own phone": "{mode} teléfono propio"
-}
+}
\ No newline at end of file
diff --git a/src/i18n/fr.json b/src/i18n/fr.json
index 25d1b303..c50f9e2b 100644
--- a/src/i18n/fr.json
+++ b/src/i18n/fr.json
@@ -635,6 +635,7 @@
 	"call not from ...": "",
 	"callers": "appelants",
 	"condition": "",
+	"data error": "",
 	"date is": "",
 	"date is ...": "",
 	"date range is": "",
@@ -643,6 +644,7 @@
 	"description": "",
 	"disabled": "désactivé",
 	"do not ring own phone": "ne pas faire sonner le téléphone personnel",
+	"empty": "",
 	"enabled": "activé",
 	"first ring": "appeler d’abord",
 	"for": "pendant",
@@ -681,4 +683,4 @@
 	"{field} must have at most {maxLength} letters": "{field} doit avoir au maximum {maxLength} caractères",
 	"{mode} of sources": "Sources {mode}",
 	"{mode} own phone": "{mode} téléphone personnel"
-}
+}
\ No newline at end of file
diff --git a/src/i18n/it.json b/src/i18n/it.json
index e43d7782..c1b765f6 100644
--- a/src/i18n/it.json
+++ b/src/i18n/it.json
@@ -635,6 +635,7 @@
 	"call not from ...": "",
 	"callers": "chiamanti",
 	"condition": "",
+	"data error": "",
 	"date is": "",
 	"date is ...": "",
 	"date range is": "",
@@ -643,6 +644,7 @@
 	"description": "descrizione",
 	"disabled": "disabilitato",
 	"do not ring own phone": "non far squillare il proprio telefono",
+	"empty": "",
 	"enabled": "abilitato",
 	"first ring": "chiama prima",
 	"for": "per",
@@ -681,4 +683,4 @@
 	"{field} must have at most {maxLength} letters": "Il campo {field} può contenere al massimo {maxLength} lettere",
 	"{mode} of sources": "{mode} dei pattern sorgente",
 	"{mode} own phone": "{mode} proprio telefono"
-}
+}
\ No newline at end of file
diff --git a/t/unit/kamailio-timesets-converter.js b/t/unit/kamailio-timesets-converter.js
deleted file mode 100644
index 7d1627ee..00000000
--- a/t/unit/kamailio-timesets-converter.js
+++ /dev/null
@@ -1,373 +0,0 @@
-'use strict';
-
-import { assert } from 'chai';
-import _ from 'lodash';
-import {
-    getHumanTimesetsNormalized,
-    humanTimesetToKamailio,
-    kamailioTimesetToHuman,
-} from '../../src/helpers/kamailio-timesets-converter'
-
-function deepEqualCheckAndInputDataMutationCheck(data, expectedResult, actionFn) {
-    const clonnedData = _.cloneDeep(data)
-    assert.deepEqual(actionFn(clonnedData), expectedResult)
-    assert.deepEqual(clonnedData, data, 'Original data were mutated')
-}
-
-describe('function getHumanTimesetsNormalized', function() {
-
-    it('case: resort', function(){
-
-        const options = [
-            { weekday: 3, from: '9:00', to: '10:00' },
-            { weekday: 2, from: '11:25', to: '15:00' },
-            { weekday: 2, from: '9:12', to: '9:22' },
-            { weekday: 2, from: '9:00', to: '9:10' }
-        ];
-        const convertedData = [
-            { weekday: 2, from: '9:00', to: '9:10' },
-            { weekday: 2, from: '9:12', to: '9:22' },
-            { weekday: 2, from: '11:25', to: '15:00' },
-            { weekday: 3, from: '9:00', to: '10:00' }
-        ]
-        deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => getHumanTimesetsNormalized(data))
-    });
-
-    it('case: combine chunks and remove duplicates', function(){
-
-        const options = [
-            { weekday: 2, from: '9:00', to: '10:00' },
-            { weekday: 2, from: '10:00', to: '12:00' },
-            { weekday: 3, from: '11:25', to: '15:00' },
-            { weekday: 3, from: '11:25', to: '15:00' },
-            { weekday: 3, from: '9:00', to: '9:30' },
-            { weekday: 3, from: '9:10', to: '11:30' },
-            { weekday: 3, from: '10:00', to: '11:30' },
-            { weekday: 3, from: '8:00', to: '8:59' }
-        ];
-        const convertedData = [
-            { weekday: 2, from: '9:00', to: '12:00' },
-            { weekday: 3, from: '8:00', to: '8:59' },
-            { weekday: 3, from: '9:00', to: '15:00' }
-        ]
-        deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => getHumanTimesetsNormalized(data))
-    });
-})
-
-describe('Human readable timesets to Kamailio format converter helpers', function() {
-
-    it('case: an empty set', function(){
-
-        const options = [];
-        const convertedData = []
-        deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => humanTimesetToKamailio(data))
-
-        const options2 = undefined;
-        const convertedData2 = []
-        deepEqualCheckAndInputDataMutationCheck(options2, convertedData2, data => humanTimesetToKamailio(data))
-    });
-
-    it('case: required field', function(){
-
-        let options = [{}];
-        assert.throws(() => humanTimesetToKamailio(options))
-
-        options = [{ weekday: 1 }];
-        assert.throws(() => humanTimesetToKamailio(options))
-
-        options = [{ weekday: 1, from: '1:00' }];
-        assert.throws(() => humanTimesetToKamailio(options))
-
-        options = [{ weekday: 1, to: '1:00' }];
-        assert.throws(() => humanTimesetToKamailio(options))
-
-        options = [{ weekday: 1, from: '1:00', to: '2:00' }];
-        assert.doesNotThrow(() => humanTimesetToKamailio(options))
-    });
-
-    it('case: Mon 6:00-6:05', function(){
-
-        let options = [
-            { weekday: 2, from: '6:00', to: '6:05' }
-        ];
-        let convertedData = [
-            { wday: 2, hour: '6', minute: '0-4' }
-        ];
-
-        deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => humanTimesetToKamailio(data))
-    });
-
-    it('case: Mon 14:05-15:00', function(){
-
-        let options = [
-            { weekday: 2, from: '14:05', to: '15:00' }
-        ];
-        let convertedData = [
-            { wday: 2, hour: '14', minute: '5-59' }
-        ];
-
-        deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => humanTimesetToKamailio(data))
-    });
-
-    it('case: Mon 6:00-15:00', function(){
-
-        let options = [
-            { weekday: 2, from: '6:00', to: '15:00' }
-        ];
-        let convertedData = [
-            { wday: 2, hour: '6-14' }
-        ];
-
-        deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => humanTimesetToKamailio(data))
-    });
-
-    it('case: Fri 3:02-21:41', function(){
-
-        let options = [
-            { weekday: 6, from: '3:02', to: '21:41' }
-        ];
-        let convertedData = [
-            { wday: 6, hour: '3', minute: '2-59' },
-            { wday: 6, hour: '4-20' },
-            { wday: 6, hour: '21', minute: '0-40' }
-        ];
-
-        deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => humanTimesetToKamailio(data))
-    });
-
-    it('case: Mon 9:01-10:00, Mon 14:05-15:00, Mon 11:00-11:29', function(){
-
-        let options = [
-            { weekday: 2, from: '9:01', to: '10:00' },
-            { weekday: 2, from: '14:05', to: '15:00' },
-            { weekday: 2, from: '11:00', to: '11:29' }
-        ];
-        let convertedData = [
-            { wday: 2, hour: '9', minute: '1-59' },
-            { wday: 2, hour: '11', minute: '0-28' },
-            { wday: 2, hour: '14', minute: '5-59' }
-        ];
-
-        deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => humanTimesetToKamailio(data))
-    });
-
-    it('case: Mon 0:00-23:59, Tue 0:00-23:58', function(){
-
-        //NOTE: 23:59 should be treated as 24:00 for TO field in interval
-        let options = [
-            { weekday: 2, from: '0:00', to: '23:59' },
-            { weekday: 3, from: '0:00', to: '23:58' }
-        ];
-        let convertedData = [
-            { wday: 2, hour: '0-23' },
-            { wday: 3, hour: '0-22' },
-            { wday: 3, hour: '23', minute: '0-57' }
-        ];
-
-        deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => humanTimesetToKamailio(data))
-    });
-
-    it('case: automatic combining time intervals', function(){
-
-        let options = [
-            { weekday: 3, from: '6:22', to: '7:44' },
-            { weekday: 3, from: '5:10', to: '8:00' },
-            { weekday: 3, from: '4:00', to: '7:00' },
-            { weekday: 3, from: '8:30', to: '11:00' },
-            { weekday: 3, from: '8:00', to: '9:30' },
-
-            { weekday: 2, from: '2:00', to: '20:00' },
-        ];
-        let convertedData = [
-            { wday: 2, hour: '2-19' },
-            { wday: 3, hour: '4-10' },
-        ];
-
-        deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => humanTimesetToKamailio(data))
-    });
-
-    it('case: wday range', function(){
-
-        let options = [
-            { weekday: 6, from: '8:00', to: '17:00' },
-            { weekday: 7, from: '8:00', to: '17:00' },
-
-            { weekday: 1, from: '8:00', to: '17:00' },
-
-            { weekday: 2, from: '8:00', to: '17:30' },
-            { weekday: 3, from: '8:00', to: '17:30' },
-            { weekday: 4, from: '8:00', to: '17:30' }
-        ];
-        let convertedData = [
-            { wday: '1-4', hour: '8-16' },
-            { wday: '2-4', hour: '17', minute: '0-29' },
-            { wday: '6-7', hour: '8-16' }
-        ];
-
-        deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => humanTimesetToKamailio(data))
-    });
-
-});
-
-describe('Kamailio format to Human readable timesets converter helpers', function() {
-
-    it('case: an empty set', function(){
-
-        const options = [];
-        const convertedData = []
-        deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => kamailioTimesetToHuman(data))
-
-        const options2 = undefined;
-        const convertedData2 = []
-        deepEqualCheckAndInputDataMutationCheck(options2, convertedData2, data => kamailioTimesetToHuman(data))
-    });
-
-    it('case: required field', function(){
-
-        const options = [{}];
-        assert.throws(() => kamailioTimesetToHuman(options))
-
-        const options2 = [{ wday: 1 }];
-        assert.doesNotThrow(() => kamailioTimesetToHuman(options2))
-    });
-
-    it('case: not supported fields', function(){
-
-        //There is not exception if we have empty not supported fields
-        let options = [
-            { wday: 1, hour: '1', minute: '1',
-              second: '', month: '', year: null, week: '', yday: '', mday: '' }
-        ];
-
-        assert.doesNotThrow(() => kamailioTimesetToHuman(options))
-
-        //There should be an exception if we have a not empty not supported field
-        let options2 = [
-            { weekday: 1, from: '1:00', to: '2:00',
-                second: '1', month: '1'}
-        ];
-
-        assert.throws(() => kamailioTimesetToHuman(options2))
-    });
-
-    it('case: Mon 6:00-6:05', function(){
-
-        let options = [
-            { wday: 2, hour: '6', minute: '0-4' }
-        ];
-        let convertedData = [
-            { weekday: 2, from: '6:00', to: '6:05' }
-        ];
-
-        deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => kamailioTimesetToHuman(data))
-    });
-
-    it('case: Mon 14:05-15:00', function(){
-
-        let options = [
-            { wday: 2, hour: '14', minute: '5-59' }
-        ];
-        let convertedData = [
-            { weekday: 2, from: '14:05', to: '15:00' }
-        ];
-
-        deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => kamailioTimesetToHuman(data))
-    });
-
-    it('case: Mon 6:00-15:00', function(){
-        let options = [
-            { wday: 2, hour: '6-14' }
-        ];
-        let convertedData = [
-            { weekday: 2, from: '6:00', to: '15:00' }
-        ];
-
-        deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => kamailioTimesetToHuman(data))
-    });
-
-    it('case: Fri 3:02-21:41', function(){
-
-        let options = [
-            { wday: 6, hour: '3', minute: '2-59' },
-            { wday: 6, hour: '4-20' },
-            { wday: 6, hour: '21', minute: '0-40' }
-        ];
-        let convertedData = [
-            { weekday: 6, from: '3:02', to: '21:41' }
-        ];
-
-        deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => kamailioTimesetToHuman(data))
-    });
-
-    it('case: Mon Mon 11:00-11:29, 9:01-10:00, Mon 14:05-15:00', function(){
-
-        let options = [
-            { wday: 2, hour: '11', minute: '0-28' },
-            { wday: 2, hour: '9', minute: '1-59' },
-            { wday: 2, hour: '14', minute: '5-59' }
-        ];
-        let convertedData = [
-            { weekday: 2, from: '9:01', to: '10:00' },
-            { weekday: 2, from: '11:00', to: '11:29' },
-            { weekday: 2, from: '14:05', to: '15:00' }
-        ];
-
-        deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => kamailioTimesetToHuman(data))
-    });
-
-    it('case: Mon 0:00-23:59, Tue 0:00-23:58', function(){
-
-        //NOTE: 23:59 should be treated as 24:00 for TO field in interval
-        let options = [
-            { wday: 2, hour: '0-23' },
-
-            { wday: 3, hour: '0-22' },
-            { wday: 3, hour: '23', minute: '0-57' }
-        ];
-        let convertedData = [
-            { weekday: 2, from: '0:00', to: '23:59' },
-            { weekday: 3, from: '0:00', to: '23:58' }
-        ];
-
-        deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => kamailioTimesetToHuman(data))
-    });
-
-    it('case: automatic combining time intervals', function(){
-
-        let options = [
-            { wday: 7, hour: '9-13' },
-
-            { wday: 2, hour: '10-13' },
-            { wday: 2, hour: '9', minute: '0-29' },
-            { wday: 2, hour: '9', minute: '30-59' },
-            { wday: 2, hour: '11-12', minute: '5-20' }
-        ];
-        let convertedData = [
-            { weekday: 2, from: '9:00', to: '14:00' },
-            { weekday: 7, from: '9:00', to: '14:00' }
-        ];
-
-        deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => kamailioTimesetToHuman(data))
-    });
-
-    it('case: wday range', function(){
-
-        let options = [
-            { wday: '1-4', hour: '8-16' },
-            { wday: '2-4', hour: '17', minute: '0-29' },
-            { wday: '6-7', hour: '8-16' }
-        ];
-        let convertedData = [
-            { weekday: 1, from: '8:00', to: '17:00' },
-
-            { weekday: 2, from: '8:00', to: '17:30' },
-            { weekday: 3, from: '8:00', to: '17:30' },
-            { weekday: 4, from: '8:00', to: '17:30' },
-
-            { weekday: 6, from: '8:00', to: '17:00' },
-            { weekday: 7, from: '8:00', to: '17:00' }
-        ];
-
-        deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => kamailioTimesetToHuman(data))
-    });
-})
diff --git a/test/jest/__tests__/helpers/kamailio-timesets-converter.spec.js b/test/jest/__tests__/helpers/kamailio-timesets-converter.spec.js
index f515ddb5..eb59310b 100644
--- a/test/jest/__tests__/helpers/kamailio-timesets-converter.spec.js
+++ b/test/jest/__tests__/helpers/kamailio-timesets-converter.spec.js
@@ -4,11 +4,13 @@ import { assert } from 'chai'
 import _ from 'lodash'
 import {
 	getHumanTimesetsNormalized,
+	humanDatesetToKamailio,
 	humanTimesetToKamailio,
+	kamailioDatesetToHuman,
 	kamailioTimesetToHuman
 } from 'src/helpers/kamailio-timesets-converter'
 
-function deepEqualCheckAndInputDataMutationCheck(data, expectedResult, actionFn) {
+function deepEqualCheckAndInputDataMutationCheck (data, expectedResult, actionFn) {
 	const clonnedData = _.cloneDeep(data)
 	assert.deepEqual(actionFn(clonnedData), expectedResult)
 	assert.deepEqual(clonnedData, data, 'Original data were mutated')
@@ -30,8 +32,8 @@ describe('function getHumanTimesetsNormalized', function () {
 			{ weekday: 2, from: '11:25', to: '15:00' },
 			{ weekday: 3, from: '9:00', to: '10:00' }
 		]
-        deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => getHumanTimesetsNormalized(data))
-    })
+		deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => getHumanTimesetsNormalized(data))
+	})
 
 	it('case: combine chunks and remove duplicates', function () {
 
@@ -50,8 +52,8 @@ describe('function getHumanTimesetsNormalized', function () {
 			{ weekday: 3, from: '8:00', to: '8:59' },
 			{ weekday: 3, from: '9:00', to: '15:00' }
 		]
-        deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => getHumanTimesetsNormalized(data))
-    });
+		deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => getHumanTimesetsNormalized(data))
+	})
 })
 
 describe('Human readable timesets to Kamailio format converter helpers', function () {
@@ -60,12 +62,12 @@ describe('Human readable timesets to Kamailio format converter helpers', functio
 
 		const options = []
 		const convertedData = []
-        deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => humanTimesetToKamailio(data))
+		deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => humanTimesetToKamailio(data))
 
 		const options2 = undefined
 		const convertedData2 = []
-        deepEqualCheckAndInputDataMutationCheck(options2, convertedData2, data => humanTimesetToKamailio(data))
-    });
+		deepEqualCheckAndInputDataMutationCheck(options2, convertedData2, data => humanTimesetToKamailio(data))
+	})
 
 	it('case: required field', function () {
 
@@ -83,31 +85,31 @@ describe('Human readable timesets to Kamailio format converter helpers', functio
 
 		options = [{ weekday: 1, from: '1:00', to: '2:00' }]
 		assert.doesNotThrow(() => humanTimesetToKamailio(options))
-    });
+	})
 
-    it('case: Mon 6:00-6:05', function(){
+	it('case: Mon 6:00-6:05', function () {
 
-        let options = [
-            { weekday: 2, from: '6:00', to: '6:05' }
-        ]
-        let convertedData = [
-            { wday: 2, hour: '6', minute: '0-4' }
-        ]
+		const options = [
+			{ weekday: 2, from: '6:00', to: '6:05' }
+		]
+		const convertedData = [
+			{ wday: 2, hour: '6', minute: '0-4' }
+		]
 
-        deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => humanTimesetToKamailio(data))
-    })
+		deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => humanTimesetToKamailio(data))
+	})
 
-    it('case: Mon 14:05-15:00', function(){
+	it('case: Mon 14:05-15:00', function () {
 
-        let options = [
-            { weekday: 2, from: '14:05', to: '15:00' }
-        ]
-        let convertedData = [
-            { wday: 2, hour: '14', minute: '5-59' }
-        ]
+		const options = [
+			{ weekday: 2, from: '14:05', to: '15:00' }
+		]
+		const convertedData = [
+			{ wday: 2, hour: '14', minute: '5-59' }
+		]
 
-        deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => humanTimesetToKamailio(data))
-    })
+		deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => humanTimesetToKamailio(data))
+	})
 
 	it('case: Mon 6:00-15:00', function () {
 
@@ -116,24 +118,24 @@ describe('Human readable timesets to Kamailio format converter helpers', functio
 		]
 		const convertedData = [
 			{ wday: 2, hour: '6-14' }
-        ];
+		]
 
-        deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => humanTimesetToKamailio(data))
-    });
+		deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => humanTimesetToKamailio(data))
+	})
 
-    it('case: Fri 3:02-21:41', function(){
+	it('case: Fri 3:02-21:41', function () {
 
-        let options = [
-            { weekday: 6, from: '3:02', to: '21:41' }
-        ];
-        let convertedData = [
-            { wday: 6, hour: '3', minute: '2-59' },
-            { wday: 6, hour: '4-20' },
-            { wday: 6, hour: '21', minute: '0-40' }
-        ];
+		const options = [
+			{ weekday: 6, from: '3:02', to: '21:41' }
+		]
+		const convertedData = [
+			{ wday: 6, hour: '3', minute: '2-59' },
+			{ wday: 6, hour: '4-20' },
+			{ wday: 6, hour: '21', minute: '0-40' }
+		]
 
-        deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => humanTimesetToKamailio(data))
-    })
+		deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => humanTimesetToKamailio(data))
+	})
 
 	it('case: Mon 9:01-10:00, Mon 14:05-15:00, Mon 11:00-11:29', function () {
 
@@ -148,8 +150,8 @@ describe('Human readable timesets to Kamailio format converter helpers', functio
 			{ wday: 2, hour: '14', minute: '5-59' }
 		]
 
-        deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => humanTimesetToKamailio(data))
-    })
+		deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => humanTimesetToKamailio(data))
+	})
 
 	it('case: Mon 0:00-23:59, Tue 0:00-23:58', function () {
 
@@ -164,8 +166,8 @@ describe('Human readable timesets to Kamailio format converter helpers', functio
 			{ wday: 3, hour: '23', minute: '0-57' }
 		]
 
-        deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => humanTimesetToKamailio(data))
-    })
+		deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => humanTimesetToKamailio(data))
+	})
 
 	it('case: automatic combining time intervals', function () {
 
@@ -183,8 +185,8 @@ describe('Human readable timesets to Kamailio format converter helpers', functio
 			{ wday: 3, hour: '4-10' }
 		]
 
-        deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => humanTimesetToKamailio(data))
-    })
+		deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => humanTimesetToKamailio(data))
+	})
 
 	it('case: wday range', function () {
 
@@ -204,9 +206,30 @@ describe('Human readable timesets to Kamailio format converter helpers', functio
 			{ wday: '6-7', hour: '8-16' }
 		]
 
-        deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => humanTimesetToKamailio(data))
-    })
+		deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => humanTimesetToKamailio(data))
+	})
+
+	it('case: hour range', function () {
+
+		const options = [
+			{ weekday: 2, from: '9:05', to: '9:30' },
+			{ weekday: 2, from: '10:05', to: '10:30' },
+			{ weekday: 2, from: '11:05', to: '11:30' },
+
+			{ weekday: 3, from: '9:05', to: '9:30' },
+			{ weekday: 3, from: '10:05', to: '10:30' },
+			{ weekday: 3, from: '11:05', to: '11:30' },
+
+			{ weekday: 4, from: '9:05', to: '9:30' },
+			{ weekday: 4, from: '10:05', to: '10:30' },
+			{ weekday: 4, from: '11:05', to: '11:30' }
+		]
+		const convertedData = [
+			{ wday: '2-4', hour: '9-11', minute: '5-29' }
+		]
 
+		deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => humanTimesetToKamailio(data))
+	})
 })
 
 describe('Kamailio format to Human readable timesets converter helpers', function () {
@@ -215,12 +238,12 @@ describe('Kamailio format to Human readable timesets converter helpers', functio
 
 		const options = []
 		const convertedData = []
-        deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => kamailioTimesetToHuman(data))
+		deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => kamailioTimesetToHuman(data))
 
-		const options2 = undefined;
+		const options2 = undefined
 		const convertedData2 = []
-        deepEqualCheckAndInputDataMutationCheck(options2, convertedData2, data => kamailioTimesetToHuman(data))
-    })
+		deepEqualCheckAndInputDataMutationCheck(options2, convertedData2, data => kamailioTimesetToHuman(data))
+	})
 
 	it('case: required field', function () {
 
@@ -252,31 +275,31 @@ describe('Kamailio format to Human readable timesets converter helpers', functio
 		]
 
 		assert.throws(() => kamailioTimesetToHuman(options2))
-    });
+	})
 
-    it('case: Mon 6:00-6:05', function(){
+	it('case: Mon 6:00-6:05', function () {
 
-        let options = [
-            { wday: 2, hour: '6', minute: '0-4' }
-        ]
-        let convertedData = [
-            { weekday: 2, from: '6:00', to: '6:05' }
-        ]
+		const options = [
+			{ wday: 2, hour: '6', minute: '0-4' }
+		]
+		const convertedData = [
+			{ weekday: 2, from: '6:00', to: '6:05' }
+		]
 
-        deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => kamailioTimesetToHuman(data))
-    })
+		deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => kamailioTimesetToHuman(data))
+	})
 
-    it('case: Mon 14:05-15:00', function(){
+	it('case: Mon 14:05-15:00', function () {
 
-        let options = [
-            { wday: 2, hour: '14', minute: '5-59' }
-        ]
-        let convertedData = [
-            { weekday: 2, from: '14:05', to: '15:00' }
-        ]
+		const options = [
+			{ wday: 2, hour: '14', minute: '5-59' }
+		]
+		const convertedData = [
+			{ weekday: 2, from: '14:05', to: '15:00' }
+		]
 
-        deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => kamailioTimesetToHuman(data))
-    })
+		deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => kamailioTimesetToHuman(data))
+	})
 
 	it('case: Mon 6:00-15:00', function () {
 		const options = [
@@ -284,24 +307,24 @@ describe('Kamailio format to Human readable timesets converter helpers', functio
 		]
 		const convertedData = [
 			{ weekday: 2, from: '6:00', to: '15:00' }
-        ];
+		]
 
-        deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => kamailioTimesetToHuman(data))
-    })
+		deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => kamailioTimesetToHuman(data))
+	})
 
-    it('case: Fri 3:02-21:41', function(){
+	it('case: Fri 3:02-21:41', function () {
 
-        let options = [
-            { wday: 6, hour: '3', minute: '2-59' },
-            { wday: 6, hour: '4-20' },
-            { wday: 6, hour: '21', minute: '0-40' }
-        ]
-        let convertedData = [
-            { weekday: 6, from: '3:02', to: '21:41' }
-        ]
+		const options = [
+			{ wday: 6, hour: '3', minute: '2-59' },
+			{ wday: 6, hour: '4-20' },
+			{ wday: 6, hour: '21', minute: '0-40' }
+		]
+		const convertedData = [
+			{ weekday: 6, from: '3:02', to: '21:41' }
+		]
 
-        deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => kamailioTimesetToHuman(data))
-    })
+		deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => kamailioTimesetToHuman(data))
+	})
 
 	it('case: Mon Mon 11:00-11:29, 9:01-10:00, Mon 14:05-15:00', function () {
 
@@ -314,10 +337,10 @@ describe('Kamailio format to Human readable timesets converter helpers', functio
 			{ weekday: 2, from: '9:01', to: '10:00' },
 			{ weekday: 2, from: '11:00', to: '11:29' },
 			{ weekday: 2, from: '14:05', to: '15:00' }
-        ]
+		]
 
-        deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => kamailioTimesetToHuman(data))
-    })
+		deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => kamailioTimesetToHuman(data))
+	})
 
 	it('case: Mon 0:00-23:59, Tue 0:00-23:58', function () {
 
@@ -333,8 +356,8 @@ describe('Kamailio format to Human readable timesets converter helpers', functio
 			{ weekday: 3, from: '0:00', to: '23:58' }
 		]
 
-        deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => kamailioTimesetToHuman(data))
-    })
+		deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => kamailioTimesetToHuman(data))
+	})
 
 	it('case: automatic combining time intervals', function () {
 
@@ -351,8 +374,8 @@ describe('Kamailio format to Human readable timesets converter helpers', functio
 			{ weekday: 7, from: '9:00', to: '14:00' }
 		]
 
-        deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => kamailioTimesetToHuman(data))
-    })
+		deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => kamailioTimesetToHuman(data))
+	})
 
 	it('case: wday range', function () {
 
@@ -372,6 +395,573 @@ describe('Kamailio format to Human readable timesets converter helpers', functio
 			{ weekday: 7, from: '8:00', to: '17:00' }
 		]
 
-        deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => kamailioTimesetToHuman(data))
+		deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => kamailioTimesetToHuman(data))
+	})
+
+	it('case: hour range', function () {
+
+		const options = [
+			{ wday: '2-4', hour: '9-11', minute: '5-29' }
+		]
+		const convertedData = [
+			{ weekday: 2, from: '9:05', to: '9:30' },
+			{ weekday: 2, from: '10:05', to: '10:30' },
+			{ weekday: 2, from: '11:05', to: '11:30' },
+
+			{ weekday: 3, from: '9:05', to: '9:30' },
+			{ weekday: 3, from: '10:05', to: '10:30' },
+			{ weekday: 3, from: '11:05', to: '11:30' },
+
+			{ weekday: 4, from: '9:05', to: '9:30' },
+			{ weekday: 4, from: '10:05', to: '10:30' },
+			{ weekday: 4, from: '11:05', to: '11:30' }
+		]
+
+		deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => kamailioTimesetToHuman(data))
+	})
+})
+
+// ----  implementation for date ranges  ----
+// ------------------------------------------
+
+describe('Human readable datesets to Kamailio format converter helpers', function () {
+
+	it('case: an empty set', function () {
+
+		const options = []
+		const convertedData = []
+		deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => humanDatesetToKamailio(data))
+
+		const options2 = undefined
+		const convertedData2 = []
+		deepEqualCheckAndInputDataMutationCheck(options2, convertedData2, data => humanDatesetToKamailio(data))
+	})
+
+	it('case: required field have correct format', function () {
+
+		let options = [{}]
+		assert.throws(() => humanDatesetToKamailio(options))
+
+		options = [{ from: '', to: '' }]
+		assert.throws(() => humanDatesetToKamailio(options))
+
+		options = [{ from: '2020/01/01' }]
+		assert.throws(() => humanDatesetToKamailio(options))
+
+		options = [{ to: '2020/01/01' }]
+		assert.throws(() => humanDatesetToKamailio(options))
+
+		options = [{ from: '1:00', to: '2:00' }]
+		assert.throws(() => humanDatesetToKamailio(options))
+
+		options = [{ from: '2020/01/00', to: '2020/01/33' }]
+		assert.throws(() => humanDatesetToKamailio(options))
+
+		options = [{ from: '2020/01/01', to: '2020/01/02' }]
+		assert.doesNotThrow(() => humanDatesetToKamailio(options))
+	})
+
+	it('case: "from" date should be equal or less than "to" date', function () {
+
+		let options = [{ from: '2020/01/02', to: '2020/01/01' }]
+		assert.throws(() => humanDatesetToKamailio(options))
+
+		options = [{ from: '2020/01/01', to: '2020/01/01' }]
+		assert.doesNotThrow(() => humanDatesetToKamailio(options))
+
+		options = [{ from: '2020/01/01', to: '2020/01/23' }]
+		assert.doesNotThrow(() => humanDatesetToKamailio(options))
+	})
+
+	it('case: 2020/05/28', function () {
+
+		const options = [
+			{ from: '2020/05/28', to: '2020/05/28' }
+		]
+		const convertedData = [
+			{ year: 2020, month: 5, mday: 28 }
+		]
+
+		deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => humanDatesetToKamailio(data))
+	})
+
+	it('case: 2020/04/05 and 2021/02/28', function () {
+
+		const options = [
+			{ from: '2021/02/28', to: '2021/02/28' },
+			{ from: '2020/04/05', to: '2020/04/05' }
+		]
+		const convertedData = [
+			{ year: 2020, month: 4, mday: 5 },
+			{ year: 2021, month: 2, mday: 28 }
+		]
+
+		deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => humanDatesetToKamailio(data))
+	})
+
+	it('case: no leading zeroes 2020/1/2', function () {
+
+		const options = [
+			{ from: '2020/1/2', to: '2020/1/2' }
+		]
+		const convertedData = [
+			{ year: 2020, month: 1, mday: 2 }
+		]
+
+		deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => humanDatesetToKamailio(data))
+	})
+
+	it('case: 2020/03/01-2020/03/31', function () {
+
+		const options = [
+			{ from: '2020/03/01', to: '2020/03/31' }
+		]
+		const convertedData = [
+			{ year: 2020, month: 3 }
+		]
+
+		deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => humanDatesetToKamailio(data))
+	})
+
+	it('case: 2020/02/02-2020/02/11', function () {
+
+		const options = [
+			{ from: '2020/02/02', to: '2020/02/11' }
+		]
+		const convertedData = [
+			{ year: 2020, month: 2, mday: '2-11' }
+		]
+
+		deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => humanDatesetToKamailio(data))
+	})
+
+	it('case: 2020/01/01-2020/02/29', function () {
+
+		const options = [
+			{ from: '2020/01/01', to: '2020/02/29' }
+		]
+		const convertedData = [
+			{ year: 2020, month: '1-2' }
+		]
+
+		deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => humanDatesetToKamailio(data))
+	})
+
+	it('case: 2020/01/02-2020/02/15', function () {
+
+		const options = [
+			{ from: '2020/01/02', to: '2020/02/15' }
+		]
+		const convertedData = [
+			{ year: 2020, month: 1, mday: '2-31' },
+			{ year: 2020, month: 2, mday: '1-15' }
+		]
+
+		deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => humanDatesetToKamailio(data))
+	})
+
+	it('case: 2020/01/01-2020/03/31', function () {
+
+		const options = [
+			{ from: '2020/01/01', to: '2020/03/31' }
+		]
+		const convertedData = [
+			{ year: 2020, month: '1-3' }
+		]
+
+		deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => humanDatesetToKamailio(data))
+	})
+
+	it('case: 2020/01/02-2020/03/31', function () {
+
+		const options = [
+			{ from: '2020/01/02', to: '2020/03/31' }
+		]
+		const convertedData = [
+			{ year: 2020, month: 1, mday: '2-31' },
+			{ year: 2020, month: '2-3' }
+		]
+
+		deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => humanDatesetToKamailio(data))
+	})
+
+	it('case: 2020/01/02-2020/03/23', function () {
+
+		const options = [
+			{ from: '2020/01/02', to: '2020/03/23' }
+		]
+		const convertedData = [
+			{ year: 2020, month: 1, mday: '2-31' },
+			{ year: 2020, month: 2 },
+			{ year: 2020, month: 3, mday: '1-23' }
+		]
+
+		deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => humanDatesetToKamailio(data))
+	})
+
+	it('case: 2020/01/02-2021/03/23', function () {
+
+		const options = [
+			{ from: '2020/01/02', to: '2021/03/23' }
+		]
+		const convertedData = [
+			{ year: 2020, month: 1, mday: '2-31' },
+			{ year: 2020, month: '2-12' },
+			{ year: 2021, month: '1-2' },
+			{ year: 2021, month: 3, mday: '1-23' }
+		]
+
+		deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => humanDatesetToKamailio(data))
+	})
+
+	it('case: 2020/01/02-2022/03/23', function () {
+
+		const options = [
+			{ from: '2020/01/02', to: '2022/03/23' }
+		]
+		const convertedData = [
+			{ year: 2020, month: 1, mday: '2-31' },
+			{ year: 2020, month: '2-12' },
+			{ year: 2021 },
+			{ year: 2022, month: '1-2' },
+			{ year: 2022, month: 3, mday: '1-23' }
+		]
+
+		deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => humanDatesetToKamailio(data))
+	})
+
+	it('case: merge 2020/01/02-2022/03/23, 2021/01/02-2023/03/23', function () {
+
+		const options = [
+			{ from: '2021/01/02', to: '2023/03/23' },
+			{ from: '2020/01/02', to: '2022/03/23' }
+		]
+		const convertedData = [
+			{ year: 2020, month: 1, mday: '2-31' },
+			{ year: 2020, month: '2-12' },
+			{ year: '2021-2022' },
+			{ year: 2023, month: '1-2' },
+			{ year: 2023, month: 3, mday: '1-23' }
+		]
+
+		deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => humanDatesetToKamailio(data))
+	})
+
+	it('case: merge 2020/01/02-2021/02/28, 2021/03/01-2023/03/23', function () {
+
+		const options = [
+			{ from: '2021/03/01', to: '2023/03/23' },
+			{ from: '2020/01/02', to: '2021/02/28' }
+		]
+		const convertedData = [
+			{ year: 2020, month: 1, mday: '2-31' },
+			{ year: 2020, month: '2-12' },
+			{ year: '2021-2022' },
+			{ year: 2023, month: '1-2' },
+			{ year: 2023, month: 3, mday: '1-23' }
+		]
+
+		deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => humanDatesetToKamailio(data))
+	})
+
+	it('case: 2020/01/02-2020/02/28 and 2021/01/02-2021/02/28 and 2022/01/02-2022/02/28', function () {
+
+		const options = [
+			{ from: '2021/01/02', to: '2021/02/28' },
+			{ from: '2020/01/02', to: '2020/02/28' },
+			{ from: '2022/01/02', to: '2022/02/28' }
+		]
+		const convertedData = [
+			{ year: '2020-2022', month: 1, mday: '2-31' },
+			{ year: 2020, month: 2, mday: '1-28' },
+			{ year: '2021-2022', month: 2 }
+		]
+
+		deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => humanDatesetToKamailio(data))
+	})
+})
+
+describe('Kamailio format to Human readable datesets converter helpers', function () {
+
+	it('case: an empty set', function () {
+
+		const options = []
+		const convertedData = []
+		deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => kamailioDatesetToHuman(data))
+
+		const options2 = undefined
+		const convertedData2 = []
+		deepEqualCheckAndInputDataMutationCheck(options2, convertedData2, data => kamailioDatesetToHuman(data))
+	})
+
+	it('case: required field have correct format', function () {
+
+		let options = [{}]
+		assert.throws(() => kamailioDatesetToHuman(options))
+
+		options = [{ year: '', month: '', mday: '' }]
+		assert.throws(() => kamailioDatesetToHuman(options))
+
+		options = [{ month: '1', mday: '2' }]
+		assert.throws(() => kamailioDatesetToHuman(options))
+
+		options = [{ year: 2020, month: 2, mday: 3 }]
+		assert.doesNotThrow(() => kamailioDatesetToHuman(options))
+
+		options = [{ year: '2020-2023', month: '3-10', mday: '5-15' }]
+		assert.doesNotThrow(() => kamailioDatesetToHuman(options))
+	})
+
+	it('case: allowed values for ranges', function () {
+
+		let options = [{ year: '2020', month: '0' }]
+		assert.throws(() => kamailioDatesetToHuman(options))
+
+		options = [{ year: '2020', month: '13' }]
+		assert.throws(() => kamailioDatesetToHuman(options))
+
+		options = [{ year: '2020', month: '1', mday: '0' }]
+		assert.throws(() => kamailioDatesetToHuman(options))
+
+		options = [{ year: '2020', month: '1', mday: '32' }]
+		assert.throws(() => kamailioDatesetToHuman(options))
+
+		options = [{ year: '2021', month: '2', mday: '1-31' }]
+		assert.doesNotThrow(() => kamailioDatesetToHuman(options))
+	})
+
+	it('case: ranges with not existing dates', function () {
+
+		// Note: we are considering that even a Kamailio date range contains some rules withs not existing dates
+		// it's ok and it is might be some part of Kamailio format optimizations for smaller ruleset.
+		// So we just skipping not existing dates in output or normalizing
+
+		let options = [
+			{ year: '2020', month: '2', mday: '31' }
+		]
+		let convertedData = []
+		deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => kamailioDatesetToHuman(data))
+
+		options = [
+			{ year: '2020', month: '1-2', mday: '31' }
+		]
+		convertedData = [
+			{ from: '2020/01/31', to: '2020/01/31' }
+		]
+		deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => kamailioDatesetToHuman(data))
+
+		options = [
+			{ year: '2021', month: '2', mday: '1-31' }
+		]
+		convertedData = [
+			{ from: '2021/02/01', to: '2021/02/28' }
+		]
+		deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => kamailioDatesetToHuman(data))
+
+		options = [
+			{ year: '2020-2021', month: '2', mday: '29-31' }
+		]
+		convertedData = [
+			{ from: '2020/02/29', to: '2020/02/29' }
+		]
+		deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => kamailioDatesetToHuman(data))
+	})
+
+	it('case: reverse ranges', function () {
+
+		let options = [{ year: '2021', month: '10-2' }]
+		assert.throws(() => kamailioDatesetToHuman(options))
+
+		options = [{ year: '2021', mday: '30-1' }]
+		assert.throws(() => kamailioDatesetToHuman(options))
+	})
+
+	it('case: 2020/05/28', function () {
+
+		const options = [
+			{ year: 2020, month: 5, mday: 28 }
+		]
+		const convertedData = [
+			{ from: '2020/05/28', to: '2020/05/28' }
+		]
+
+		deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => kamailioDatesetToHuman(data))
+	})
+
+	it('case: 2020/04/05 and 2021/02/28', function () {
+
+		const options = [
+			{ year: 2021, month: 2, mday: 28 },
+			{ year: 2020, month: 4, mday: 5 }
+		]
+		const convertedData = [
+			{ from: '2020/04/05', to: '2020/04/05' },
+			{ from: '2021/02/28', to: '2021/02/28' }
+		]
+
+		deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => kamailioDatesetToHuman(data))
+	})
+
+	it('case: leading zeroes in string 2020/01/02', function () {
+
+		const options = [
+			{ year: '2020', month: '01', mday: '02' }
+		]
+		const convertedData = [
+			{ from: '2020/01/02', to: '2020/01/02' }
+		]
+
+		deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => kamailioDatesetToHuman(data))
+	})
+
+	it('case: 2020/03/01-2020/03/31', function () {
+
+		const options = [
+			{ year: 2020, month: 3 }
+		]
+		const convertedData = [
+			{ from: '2020/03/01', to: '2020/03/31' }
+		]
+
+		deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => kamailioDatesetToHuman(data))
+	})
+
+	it('case: 2020/02/02-2020/02/11', function () {
+
+		const options = [
+			{ year: 2020, month: 2, mday: '2-11' }
+		]
+		const convertedData = [
+			{ from: '2020/02/02', to: '2020/02/11' }
+		]
+
+		deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => kamailioDatesetToHuman(data))
+	})
+
+	it('case: 2020/01/01-2020/02/29', function () {
+
+		const options = [
+			{ year: 2020, month: '1-2' }
+		]
+		const convertedData = [
+			{ from: '2020/01/01', to: '2020/02/29' }
+		]
+
+		deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => kamailioDatesetToHuman(data))
+	})
+
+	it('case: 2020/01/02-2020/02/15', function () {
+
+		const options = [
+			{ year: 2020, month: 1, mday: '2-31' },
+			{ year: 2020, month: 2, mday: '1-15' }
+		]
+		const convertedData = [
+			{ from: '2020/01/02', to: '2020/02/15' }
+		]
+
+		deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => kamailioDatesetToHuman(data))
+	})
+
+	it('case: 2020/01/01-2020/03/31', function () {
+
+		const options = [
+			{ year: 2020, month: '1-3' }
+		]
+		const convertedData = [
+			{ from: '2020/01/01', to: '2020/03/31' }
+		]
+
+		deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => kamailioDatesetToHuman(data))
+	})
+
+	it('case: 2020/01/02-2020/03/31', function () {
+
+		const options = [
+			{ year: 2020, month: 1, mday: '2-31' },
+			{ year: 2020, month: '2-3' }
+		]
+		const convertedData = [
+			{ from: '2020/01/02', to: '2020/03/31' }
+		]
+
+		deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => kamailioDatesetToHuman(data))
+	})
+
+	it('case: 2020/01/02-2020/03/23', function () {
+
+		const options = [
+			{ year: 2020, month: 1, mday: '2-31' },
+			{ year: 2020, month: 2 },
+			{ year: 2020, month: 3, mday: '1-23' }
+		]
+		const convertedData = [
+			{ from: '2020/01/02', to: '2020/03/23' }
+		]
+
+		deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => kamailioDatesetToHuman(data))
+	})
+
+	it('case: 2020/01/02-2021/03/23', function () {
+
+		const options = [
+			{ year: 2020, month: 1, mday: '2-31' },
+			{ year: 2020, month: '2-12' },
+			{ year: 2021, month: '1-2' },
+			{ year: 2021, month: 3, mday: '1-23' }
+		]
+		const convertedData = [
+			{ from: '2020/01/02', to: '2021/03/23' }
+		]
+
+		deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => kamailioDatesetToHuman(data))
+	})
+
+	it('case: 2020/01/02-2022/03/23', function () {
+
+		const options = [
+			{ year: 2020, month: 1, mday: '2-31' },
+			{ year: 2020, month: '2-12' },
+			{ year: 2021 },
+			{ year: 2022, month: '1-2' },
+			{ year: 2022, month: 3, mday: '1-23' }
+		]
+		const convertedData = [
+			{ from: '2020/01/02', to: '2022/03/23' }
+		]
+
+		deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => kamailioDatesetToHuman(data))
+	})
+
+	it('case: merge 2020/01/01-2020/01/15 and 2020/01/05-2020/01/31', function () {
+
+		const options = [
+			{ year: 2020, month: 1, mday: '5-31' },
+			{ year: 2020, month: 1, mday: '5-31' },
+
+			{ year: 2020, month: 1, mday: '1-15' },
+			{ year: 2020, month: 1, mday: '1-15' }
+		]
+		const convertedData = [
+			{ from: '2020/01/01', to: '2020/01/31' }
+		]
+
+		deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => kamailioDatesetToHuman(data))
+	})
+
+	it('case: 2020/01/02-2020/02/28 and 2021/01/02-2021/02/28 and 2022/01/02-2022/02/28', function () {
+
+		const options = [
+			{ year: '2021-2022', month: 2 },
+			{ year: 2020, month: 2, mday: '1-28' },
+			{ year: '2020-2022', month: 1, mday: '2-31' }
+		]
+		const convertedData = [
+			{ from: '2020/01/02', to: '2020/02/28' },
+			{ from: '2021/01/02', to: '2021/02/28' },
+			{ from: '2022/01/02', to: '2022/02/28' }
+		]
+
+		deepEqualCheckAndInputDataMutationCheck(options, convertedData, data => kamailioDatesetToHuman(data))
 	})
 })