diff --git a/ec2-create-ce b/ec2-create-ce
index 739361f..0ce8961 100755
--- a/ec2-create-ce
+++ b/ec2-create-ce
@@ -10,7 +10,7 @@ export TZ="UTC"
 [ -n "$KEY_FILE" ] || KEY_FILE="${HOME}/${KEY_NAME}.pem"
 [ -n "$SECURITY_GROUP" ] || SECURITY_GROUP="sipwise-only"
 [ -n "$TAG_PURPOSE" ] || TAG_PURPOSE="ngcp-create-ce-ami"
-DATE_STRING=$(date +%Y-%m-%d_%H:%m)
+DATE_STRING=$(date +%Y-%m-%d_%H:%M)
 
 # retrieve AWS_* environment variables
 if [ -r "$HOME/.ec2-create-ngcp" ] ; then