From: | Jasen Betts <jasen(at)xnet(dot)co(dot)nz> |
---|---|
To: | pgsql-sql(at)postgresql(dot)org |
Subject: | Re: How to get the previous date? |
Date: | 2009-10-17 11:41:47 |
Message-ID: | hbcahr$k31$1@reversiblemaps.ath.cx |
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Lists: | pgsql-sql |
On 2009-10-14, Shruthi A <shruthi(dot)iisc(at)gmail(dot)com> wrote:
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>
> Hi,
>
> I'm using Enterprise DB PostgresPlus version 8.3.
> Is there is a simple function or command like previous_date(mydate) which
> when passed a particular date, simply returns the previous date? I tried
>
> mydate - 1
>
> but this doesnt work.
it should, if mydate is a date variable.
if it's some sort of timestamp more care is needed
mytimestamp - interval'1 day'
also don't use interval'24h' unless you want 24h, because not all days are 24h
select timestamptz'2009-09-28 00:30' - interval'24 h' ;
?column?
------------------------
2009-09-26 23:30:00+12
(the interval crosses the local start of DST)
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