Re: BUG #14337: "HDT" time zone is not recognized by PostreSQL 9.5

pszegheo@itnnetworks.com writes:
> "HDT" time zone is not recognized by PostreSQL 9.5
> Neither are the more modern HADT and HAST time zones recognized by PostreSQL
> 9.5

The IANA timezone database does not think that either HAST or HDST have
ever been in common use, and HDT hasn't been in use since 1945:

# Zone    NAME        GMTOFF    RULES    FORMAT    [UNTIL]
Zone Pacific/Honolulu    -10:31:26 -    LMT    1896 Jan 13 12:00
            -10:30    -    HST    1933 Apr 30  2:00
            -10:30    1:00    HDT    1933 May 21 12:00
            -10:30    -    HST    1942 Feb  9  2:00
            -10:30    1:00    HDT    1945 Sep 30  2:00
            -10:30    -    HST    1947 Jun  8  2:00
            -10:00    -    HST

We generally avoid including nonstandard abbreviations in PG's default
timezone abbreviations list, since they seem more likely to allow garbage
data to be entered than to be useful.  Of course, you can set up your own
abbreviation list if you wish to use specific additional abbreviations.
See
https://www.postgresql.org/docs/9.5/static/datetime-config-files.html


            regards, tom lane