| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | greg(dot)brown(at)csgi(dot)com |
| Cc: | pgsql-docs(at)lists(dot)postgresql(dot)org |
| Subject: | Re: pg_timezone_names |
| Date: | 2018-01-17 17:33:29 |
| Message-ID: | 9007.1516210409@sss.pgh.pa.us |
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| Lists: | pgsql-docs |
=?utf-8?q?PG_Doc_comments_form?= <noreply(at)postgresql(dot)org> writes:
> We are exporting data from postgres into another "all in one" data store,
> and i had a quick question regarding the time offsets. The UTC_OFFSET, does
> it change when IS_DST is true/false?
Yes; utc_offset reflects the zone's current offset from UTC, so it changes
with the seasons if the zone has DST laws.
> Or do I need to take the UTC_OFFSET
> interval and then possibly add 1 more if IS_DST is true?
Prepare to be disappointed; you can't assume it works like that.
See the thread starting here:
http://mm.icann.org/pipermail/tz/2017-December/025682.html
You haven't said what it is you are hoping to accomplish, so it's
hard to say if there's some safer way to do it.
regards, tom lane
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