Rajin Raj <rajin.raj@opsveda.com> writes: > Option 1: <some_date with tz> AT TIME ZONE 'IST' > Option 2: <some_date with tz> AT TIME ZONE 'Asia/Kolkata' > In the first option, I get +2:00:00 offset (when *timezone_abbrevations = > 'Default'*) and for option 2 , +5:30 offset.
> I can see multiple entries for IST in pg_timezone_names with > different utc_offset, but in pg_timezone_abbrev there is one entry. I guess > AT TIME ZONE function using the offset shown in pg_timezone_abbrev.
No. If you use an abbreviation rather than a spelled-out zone name, you get whatever the timezone_abbrevations file says, which by default is
$ grep IST .../postgresql/share/timezonesets/Default # CONFLICT! IST is not unique # - IST: Irish Standard Time (Europe) # - IST: Indian Standard Time (Asia) IST 7200 # Israel Standard Time
