| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Pete Forman <pete(dot)forman(at)westerngeco(dot)com> |
| Cc: | lockhart(at)fourpalms(dot)org, Zeugswetter Andreas SB <ZeugswetterA(at)wien(dot)spardat(dot)at>, "'pgsql-hackers(at)postgresql(dot)org'" <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: AW: Re: tinterval - operator problems on AIX |
| Date: | 2001-01-12 17:34:51 |
| Message-ID: | 16586.979320891@sss.pgh.pa.us |
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| Lists: | pgsql-hackers |
Pete Forman <pete(dot)forman(at)westerngeco(dot)com> writes:
> It is fairly arbitrary what the answer to this question is: if six
> months is subtracted from a to give b, should a.local.hour =
> b.local.hour or should a.utc.hour = b.utc.hour? If you want the
> former then set tm_isdst = -1 before calling mktime.
It's not arbitrary: we want the former. Anything else generates
bug reports from people who expect "9/1/2000 - six months" to
produce "3/1/2000", not sometime late in the evening of 2/29/2000.
regards, tom lane
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