diff --git a/lib/NGCP/Panel/Controller/API/CallLists.pm b/lib/NGCP/Panel/Controller/API/CallLists.pm
index 8ebfa8d306..1f89fc6e1e 100644
--- a/lib/NGCP/Panel/Controller/API/CallLists.pm
+++ b/lib/NGCP/Panel/Controller/API/CallLists.pm
@@ -12,6 +12,7 @@ use HTTP::Status qw(:constants);
 use NGCP::Panel::Utils::DateTime;
 use DateTime::TimeZone;
 use NGCP::Panel::Utils::CallList qw();
+use NGCP::Panel::Utils::API::Calllist qw();
 require Catalyst::ActionRole::ACL;
 require Catalyst::ActionRole::CheckTrailingSlash;
 require NGCP::Panel::Role::HTTPMethods;
@@ -31,6 +32,10 @@ sub query_params {
             param => 'tz',
             description => 'Format start_time according to the optional time zone provided here, e.g. Europe/Berlin.',
         },
+        {
+            param => 'use_owner_tz',
+            description => 'Format start_time according to the filtered customer\'s/subscribers\'s inherited time zone.',
+        },
         {
             param => 'subscriber_id',
             description => 'Filter for calls for a specific subscriber. Either this or customer_id is mandatory if called by admin, reseller or subscriberadmin to filter list down to a specific subscriber in order to properly determine the direction of calls.',
@@ -307,12 +312,8 @@ sub GET :Allow {
     my $rows = $c->request->params->{rows} // 10;
     my $schema = $c->model('DB');
     {
-        if($c->req->param('tz') && !DateTime::TimeZone->is_valid_name($c->req->param('tz'))) {
-            $self->error($c, HTTP_UNPROCESSABLE_ENTITY, "Query parameter 'tz' value is not a valid time zone");
-            return;
-        }
 
-        my $owner = $self->get_owner_data($c, $schema);
+        my $owner = NGCP::Panel::Utils::API::Calllist::get_owner_data($self,$c, $schema);
         last unless $owner;
         $c->stash(owner => $owner); # for query_param: direction
         my $items = $self->item_rs($c);
diff --git a/lib/NGCP/Panel/Controller/API/CallListsItem.pm b/lib/NGCP/Panel/Controller/API/CallListsItem.pm
index 93a55208f4..d379c5801b 100644
--- a/lib/NGCP/Panel/Controller/API/CallListsItem.pm
+++ b/lib/NGCP/Panel/Controller/API/CallListsItem.pm
@@ -8,6 +8,7 @@ use HTTP::Status qw(:constants);
 
 use NGCP::Panel::Utils::ValidateJSON qw();
 use DateTime::TimeZone;
+use NGCP::Panel::Utils::API::Calllist qw();
 require Catalyst::ActionRole::ACL;
 require NGCP::Panel::Role::HTTPMethods;
 require Catalyst::ActionRole::RequireSSL;
@@ -57,17 +58,13 @@ sub auto :Private {
 sub GET :Allow {
     my ($self, $c, $id) = @_;
     {
-        if($c->req->param('tz') && !DateTime::TimeZone->is_valid_name($c->req->param('tz'))) {
-            $self->error($c, HTTP_UNPROCESSABLE_ENTITY, "Query parameter 'tz' value is not a valid time zone");
-            return;
-        }
 
         my $schema = $c->model('DB');
         last unless $self->valid_id($c, $id);
 
-        my $owner = $self->get_owner_data($c, $schema);
+        my $owner = NGCP::Panel::Utils::API::Calllist::get_owner_data($self,$c, $schema);
         last unless $owner;
-        my $href_data = $owner->{subscriber} ? 
+        my $href_data = $owner->{subscriber} ?
             "subscriber_id=".$owner->{subscriber}->id :
             "customer_id=".$owner->{customer}->id;
 
diff --git a/lib/NGCP/Panel/Controller/API/Faxes.pm b/lib/NGCP/Panel/Controller/API/Faxes.pm
index 069aa265f1..ed3408b511 100644
--- a/lib/NGCP/Panel/Controller/API/Faxes.pm
+++ b/lib/NGCP/Panel/Controller/API/Faxes.pm
@@ -35,6 +35,14 @@ sub api_description {
 
 sub query_params {
     return [
+        {
+            param => 'tz',
+            description => 'Format timestamp according to the optional time zone provided here, e.g. Europe/Berlin.',
+        },
+        {
+            param => 'use_owner_tz',
+            description => 'Format timestamp according to the filtered customer\'s/subscribers\'s inherited time zone.',
+        },
         {
             param => 'subscriber_id',
             description => 'Filter for faxes belonging to a specific subscriber',
@@ -50,7 +58,7 @@ sub query_params {
 
         {
             param => 'time_from',
-            description => 'Filter for faxes performed after or at the given time stamp.',
+            description => 'Filter for faxes performed after or at the given timestamp.',
             query => {
                 first => sub {
                     my $q = shift;
@@ -63,7 +71,7 @@ sub query_params {
 
         {
             param => 'time_to',
-            description => 'Filter for faxes performed before or at the given time stamp.',
+            description => 'Filter for faxes performed before or at the given timestamp.',
             query => {
                 first => sub {
                     my $q = shift;
@@ -72,8 +80,7 @@ sub query_params {
                 },
                 second => sub { },
             },
-        }, 
-
+        },
         {
             param => 'sid',
             description => 'Filter for a fax with the specific session id',
diff --git a/lib/NGCP/Panel/Controller/API/Voicemails.pm b/lib/NGCP/Panel/Controller/API/Voicemails.pm
index b1732c7c28..95e4c04b49 100644
--- a/lib/NGCP/Panel/Controller/API/Voicemails.pm
+++ b/lib/NGCP/Panel/Controller/API/Voicemails.pm
@@ -24,6 +24,14 @@ sub api_description {
 
 sub query_params {
     return [
+        {
+            param => 'tz',
+            description => 'Format timestamp according to the optional time zone provided here, e.g. Europe/Berlin.',
+        },
+        {
+            param => 'use_owner_tz',
+            description => 'Format timestamp according to the filtered customer\'s/subscribers\'s inherited time zone.',
+        },
         {
             param => 'subscriber_id',
             description => 'Filter for voicemails belonging to a specific subscriber',
@@ -121,7 +129,7 @@ sub GET :Allow {
         $hal->resource({
             total_count => $total_count,
         });
-        my $response = HTTP::Response->new(HTTP_OK, undef, 
+        my $response = HTTP::Response->new(HTTP_OK, undef,
             HTTP::Headers->new($hal->http_headers(skip_links => 1)), $hal->as_json);
         $c->response->headers($response->headers);
         $c->response->body($response->content);
diff --git a/lib/NGCP/Panel/Role/API/CallLists.pm b/lib/NGCP/Panel/Role/API/CallLists.pm
index fd24c3c0b3..12b32eccc3 100644
--- a/lib/NGCP/Panel/Role/API/CallLists.pm
+++ b/lib/NGCP/Panel/Role/API/CallLists.pm
@@ -16,6 +16,7 @@ use NGCP::Panel::Utils::DateTime;
 use NGCP::Panel::Utils::CallList;
 use NGCP::Panel::Utils::Subscriber;
 use NGCP::Panel::Utils::CallList qw();
+use NGCP::Panel::Utils::API::Calllist qw();
 
 sub _item_rs {
     my ($self, $c) = @_;
@@ -109,14 +110,10 @@ sub resource_from_item {
     my $datetime_fmt = DateTime::Format::Strptime->new(
         pattern => '%F %T',
     );
-    if($c->req->param('tz') && DateTime::TimeZone->is_valid_name($c->req->param('tz'))) {
-        # valid tz is checked in the controllers' GET already, but just in case
-        # it passes through via POST or something, then just ignore wrong tz
-        $item->start_time->set_time_zone($c->req->param('tz'));
-    }
+    my $start_time = NGCP::Panel::Utils::API::Calllist::apply_owner_timezone($self,$c,$item->start_time,$owner);
 
-    $resource->{start_time} = $datetime_fmt->format_datetime($item->start_time);
-    $resource->{start_time} .= '.'.$item->start_time->millisecond if $item->start_time->millisecond > 0.0;
+    $resource->{start_time} = $datetime_fmt->format_datetime($start_time);
+    $resource->{start_time} .= '.'.$start_time->millisecond if $start_time->millisecond > 0.0;
     return $resource;
 }
 
@@ -126,76 +123,5 @@ sub item_by_id {
     return $item_rs->find($id);
 }
 
-sub get_owner_data {
-    my ($self, $c, $schema) = @_;
-
-    my $ret;
-    if($c->user->roles eq "admin" || $c->user->roles eq "reseller") {
-        if($c->req->param('subscriber_id')) {
-            my $sub = $schema->resultset('voip_subscribers')->find($c->req->param('subscriber_id'));
-            unless($sub) {
-                $self->error($c, HTTP_NOT_FOUND, "Invalid 'subscriber_id'.");
-                return;
-            }
-            if($c->user->roles eq "reseller" && $sub->contract->contact->reseller_id != $c->user->reseller_id) {
-                $self->error($c, HTTP_NOT_FOUND, "Invalid 'subscriber_id'.");
-                return;
-            }
-            return {
-                subscriber => $sub,
-                customer => $sub->contract,
-            };
-        } elsif($c->req->param('customer_id')) {
-            my $cust = $schema->resultset('contracts')->find($c->req->param('customer_id'));
-            unless($cust && $cust->contact->reseller_id) {
-                $self->error($c, HTTP_NOT_FOUND, "Invalid 'customer_id'.");
-                return;
-            }
-            if($c->user->roles eq "reseller" && $cust->contact->reseller_id != $c->user->reseller_id) {
-                $self->error($c, HTTP_NOT_FOUND, "Invalid 'customer_id'.");
-                return;
-            }
-            return {
-                subscriber => undef,
-                customer => $cust,
-            };
-        } else {
-            $self->error($c, HTTP_UNPROCESSABLE_ENTITY, "Mandatory parameter 'subscriber_id' or 'customer_id' missing in request");
-            return;
-        }
-    } elsif($c->user->roles eq "subscriberadmin") {
-        if($c->req->param('subscriber_id')) {
-            my $sub = $schema->resultset('voip_subscribers')->find($c->req->param('subscriber_id'));
-            unless($sub) {
-                $self->error($c, HTTP_NOT_FOUND, "Invalid 'subscriber_id'.");
-                return;
-            }
-            if($sub->contract_id != $c->user->account_id) {
-                $self->error($c, HTTP_NOT_FOUND, "Invalid 'subscriber_id'.");
-                return;
-            }
-            return {
-                subscriber => $sub,
-                customer => $sub->contract,
-            };
-        } else {
-            my $cust = $schema->resultset('contracts')->find($c->user->account_id);
-            unless($cust && $cust->contact->reseller_id) {
-                $self->error($c, HTTP_NOT_FOUND, "Invalid 'customer_id'.");
-                return;
-            }
-            return {
-                subscriber => undef,
-                customer => $cust,
-            };
-        }
-    } else {
-        return {
-            subscriber => $c->user->voip_subscriber,
-            customer => $c->user->voip_subscriber->contract,
-        };
-    }
-}
-
 1;
 # vim: set tabstop=4 expandtab:
diff --git a/lib/NGCP/Panel/Role/API/Faxes.pm b/lib/NGCP/Panel/Role/API/Faxes.pm
index e5eb9cc90d..248fb0f79b 100644
--- a/lib/NGCP/Panel/Role/API/Faxes.pm
+++ b/lib/NGCP/Panel/Role/API/Faxes.pm
@@ -76,7 +76,10 @@ sub resource_from_item {
 
     my %resource = ();
     $resource{id} = int($item->id);
-    $resource{time} = $datetime_fmt->format_datetime($item->time);
+    $resource{time} = $datetime_fmt->format_datetime(
+        NGCP::Panel::Utils::API::Calllist::apply_owner_timezone($self,$c,$item->time,
+        NGCP::Panel::Utils::API::Calllist::get_owner_data($self,$c, undef, undef, 1)
+    ));
     $resource{subscriber_id} = int($subscriber->id);
     foreach(qw/direction caller callee reason status quality filename/){
         $resource{$_} = $item->$_;
diff --git a/lib/NGCP/Panel/Role/API/Voicemails.pm b/lib/NGCP/Panel/Role/API/Voicemails.pm
index 792f56a5de..b99bc8a60d 100644
--- a/lib/NGCP/Panel/Role/API/Voicemails.pm
+++ b/lib/NGCP/Panel/Role/API/Voicemails.pm
@@ -11,6 +11,7 @@ use NGCP::Panel::Utils::DataHal qw();
 use NGCP::Panel::Utils::DataHalLink qw();
 use HTTP::Status qw(:constants);
 use NGCP::Panel::Utils::Subscriber;
+use NGCP::Panel::Utils::API::Calllist qw();
 
 sub _item_rs {
     my ($self, $c) = @_;
@@ -75,10 +76,16 @@ sub hal_from_item {
 sub resource_from_item {
     my ($self, $c, $item, $form) = @_;
 
+    my $datetime_fmt = DateTime::Format::Strptime->new(
+        pattern => '%F %T',
+    );
+
     my %resource = ();
     $resource{id} = int($item->id);
     $resource{duration} = is_int($item->duration) ? int($item->duration) : 0;
-    $resource{time} = "" . $item->origtime;
+    $resource{time} = "" . NGCP::Panel::Utils::API::Calllist::apply_owner_timezone($self,$c,$item->origtime,
+        NGCP::Panel::Utils::API::Calllist::get_owner_data($self,$c, undef, undef, 1)
+    );
     $resource{caller} = $item->callerid;
     $resource{subscriber_id} = int($item->mailboxuser->provisioning_voip_subscriber->voip_subscriber->id);
 
diff --git a/lib/NGCP/Panel/Utils/API/Calllist.pm b/lib/NGCP/Panel/Utils/API/Calllist.pm
new file mode 100644
index 0000000000..24b031abca
--- /dev/null
+++ b/lib/NGCP/Panel/Utils/API/Calllist.pm
@@ -0,0 +1,146 @@
+package NGCP::Panel::Utils::API::Calllist;
+use strict;
+use warnings;
+
+use HTTP::Status qw(:constants);
+
+
+sub get_owner_data {
+    my ($self, $c, $schema, $source, $optional_for_admin_reseller) = @_;
+
+    my $ret;
+    $source //= $c->req->params;
+    my $src_subscriber_id = $source->{subscriber_id};
+    my $src_customer_id = $source->{customer_id};
+
+    $schema //= $c->model('DB');
+
+    if($c->user->roles eq "admin" || $c->user->roles eq "reseller") {
+        if($src_subscriber_id) {
+            my $sub = $schema->resultset('voip_subscribers')->find($src_subscriber_id);
+            unless($sub) {
+                $self->error($c, HTTP_NOT_FOUND, "Invalid 'subscriber_id'.");
+                return;
+            }
+            if($c->user->roles eq "reseller" && $sub->contract->contact->reseller_id != $c->user->reseller_id) {
+                $self->error($c, HTTP_NOT_FOUND, "Invalid 'subscriber_id'.");
+                return;
+            }
+            return {
+                subscriber => $sub,
+                customer => $sub->contract,
+            };
+        } elsif($src_customer_id) {
+            my $cust = $schema->resultset('contracts')->find($src_customer_id);
+            unless($cust && $cust->contact->reseller_id) {
+                $self->error($c, HTTP_NOT_FOUND, "Invalid 'customer_id'.");
+                return;
+            }
+            if($c->user->roles eq "reseller" && $cust->contact->reseller_id != $c->user->reseller_id) {
+                $self->error($c, HTTP_NOT_FOUND, "Invalid 'customer_id'.");
+                return;
+            }
+            return {
+                subscriber => undef,
+                customer => $cust,
+            };
+        } elsif (not $optional_for_admin_reseller) {
+            $self->error($c, HTTP_UNPROCESSABLE_ENTITY, "Mandatory parameter 'subscriber_id' or 'customer_id' missing in request");
+            return;
+        }
+    } elsif($c->user->roles eq "subscriberadmin") {
+        if($src_subscriber_id) {
+            my $sub = $schema->resultset('voip_subscribers')->find($src_subscriber_id);
+            unless($sub) {
+                $self->error($c, HTTP_NOT_FOUND, "Invalid 'subscriber_id'.");
+                return;
+            }
+            if($sub->contract_id != $c->user->account_id) {
+                $self->error($c, HTTP_NOT_FOUND, "Invalid 'subscriber_id'.");
+                return;
+            }
+            return {
+                subscriber => $sub,
+                customer => $sub->contract,
+            };
+        } else {
+            my $cust = $schema->resultset('contracts')->find($c->user->account_id);
+            unless($cust && $cust->contact->reseller_id) {
+                $self->error($c, HTTP_NOT_FOUND, "Invalid 'customer_id'.");
+                return;
+            }
+            return {
+                subscriber => undef,
+                customer => $cust,
+            };
+        }
+    } elsif($c->user->roles eq "subscriber") {
+        return {
+            subscriber => $c->user->voip_subscriber,
+            customer => $c->user->voip_subscriber->contract,
+        };
+    } else {
+        $self->error($c, HTTP_NOT_FOUND, "Unknown role '".$c->user->roles."' of the user.");
+        return;
+    }
+}
+
+sub apply_owner_timezone {
+    my ($self,$c,$dt,$owner) = @_;
+    my $result = $dt->clone;
+    if($c->req->param('tz')) {
+        if (DateTime::TimeZone->is_valid_name($c->req->param('tz'))) {
+            # valid tz is checked in the controllers' GET already, but just in case
+            # it passes through via POST or something, then just ignore wrong tz
+            $result->set_time_zone($c->req->param('tz'));
+        } else {
+            $self->error($c, HTTP_UNPROCESSABLE_ENTITY, "Query parameter 'tz' value is not a valid time zone");
+            return;
+        }
+    } elsif ($owner and $c->req->param('use_owner_tz')) {
+        my $tz;
+        my $sub = $owner->{subscriber};
+        my $cust = $owner->{customer};
+        if ($owner->{subscriber}) {
+            $tz = $c->model('DB')->resultset('voip_subscriber_timezone')->search_rs({
+                subscriber_id => $owner->{subscriber}->id
+            })->first;
+        } elsif ($owner->{customer}) {
+            $tz = $c->model('DB')->resultset('contract_timezone')->search_rs({
+                contract_id => $owner->{customer}->id
+            })->first;
+        } else {
+            # shouldnt go here.
+        }
+        $result->set_time_zone($tz->name) if $tz;
+    }
+    return $result;
+}
+
+1;
+
+=head1 NAME
+
+NGCP::Panel::Utils::API::Calllist
+
+=head1 DESCRIPTION
+
+A temporary helper to manipulate calls related data in REST API modules
+
+=head1 METHODS
+
+=head2 get_owner_data
+
+Check if mandatory calls list parameters customer_id or subscriber_id are presented and get proper objects.
+
+=head1 AUTHOR
+
+Irina Peshinskaya
+
+=head1 LICENSE
+
+This library is free software. You can redistribute it and/or modify
+it under the same terms as Perl itself.
+
+=cut
+# vim: set tabstop=4 expandtab: