Issue with Kibana Time Filter-7.5.2

We have 2 servers set- one for Elasticsearch and the other for Kibana (ES version-7.5.1 and Kibana's version- 7.5.2 respectively). Both servers have their timezone set to IST. No filebeat or collector is being used anywhere.
A time index is created on ES namely "searchedOn" with date type and format yyyy-mm-dd:HH-mm-ss. As soon as search is placed on my application, information gets logged into ES perfectly.
On Kibana the data gets logged without any hassle(under normal dashboard). But when I try to add a filter to modify my search on the basis of " _id/phrase/searched By/searchedOn'' or anything, I get data under "Today's" filter and "1 weeks" filter only. For filters like " 15 minutes/30 minutes/1 hour/24 hours" I get an error saying "Expand your time range".

I have tried to inspect the dashboard data request and response. For Today/1 week filter the information I receive is :
searchedOn": {
"format": "strict_date_optional_time",
"gte": "2020-07-15T00:00:00.000Z",
"lte": "2020-07-15T23:59:59.999Z"

And for any other filter(24 hours/last 7 days etc) :
"searchedOn": {
"format": "strict_date_optional_time",
"gte": "2020-07-08T11:45:32.680Z",
"lte": "2020-07-15T11:45:32.680Z"

Even under normal dashboard(when no search filter is added to search data) the Inspect shows 2 different gte and lte values. For Today/1 week it shows current date time as per my Time Zone (Asia/Calcutta). But for other Time filters it shows the date time for -5:30 hrs.

Data getting logged is not incorrect but there is some loophole in Time zone because of which I am unable to identify my exact data count.

Any help would be highly appreciated.

Thanks in advance.

When you are inspecting the request which includes the searchedOn, the time format should be in UTC. This is why you are seeing a -5:30 difference, since that is the offset for IST to UTC.

These issues are normally caused by the data. is there a document you can grab to verify that the searchedOn time is correct when in UTC?

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