@rsclmumbai @hemanthnalluri
The problem is actually with PHP's native timezone_name_from_abbr() method. When passing 'IST' to this method it returns 'Asia/Jerusalem' like we see in all these cases. Seems like this needs to be addressed on their level. I can create a patch to temporarily return 'Asia/Kolkata' instead but this is only a bandaid instead of a permanent fix.
Cheers.