On Mon, Mar 31, 2025 at 8:39 PM Jayadevan M <maymala.jayade...@gmail.com> wrote:
> Hello PG members, > I used 'IST' in a query like this - * (timestamp_hour) at time zone > 'IST' time_ist *and did not get the expected output - timestamp in Indian > Standard Time. So I queried the 2 views that provide timezone info and did > not really understand the abbrev column. > select name, abbrev, utc_offset from pg_timezone_names where abbrev = > 'IST' ; > Since the S and T are non-location specific you get 26 different timezone abbreviations to choose from. That wasn't enough for the world. So IST is non-unique; and for historical reasons Ireland (Eire, which contains Dublin) is given default priority. > name | abbrev | utc_offset > ---------------+--------+------------ > Eire | IST | 01:00:00 > Asia/Kolkata | IST | 05:30:00 > Asia/Calcutta | IST | 05:30:00 > Europe/Dublin | IST | 01:00:00 > Suggest you adapt to using ISO names (the name column above) for timezones; which are long enough and location-specific enough to be unique. In your case, pick your preferred spelling of Calcutta I suppose. There is a way to get a different interpretation for IST to be recognized but I'd have to find it or wait for others to chime in. David J.
