Re: A creepy story about dates. How to prevent it?

From: Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>
To: "scott(dot)marlowe" <scott(dot)marlowe(at)ihs(dot)com>
Cc: Lincoln Yeoh <lyeoh(at)pop(dot)jaring(dot)my>, pgsql-general(at)postgresql(dot)org
Subject: Re: A creepy story about dates. How to prevent it?
Date: 2003-06-24 21:02:24
Message-ID: 200306242102.h5OL2OV27729@candle.pha.pa.us
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Good point.

---------------------------------------------------------------------------

scott.marlowe wrote:
> I thought it was more correctly we were considering not using the the
> system locale automatically, but that if someone wished to use
> --locale=en_US we'd let that work, right?
>
> I would assume that if someone actually went to the bother of setting a
> locale, then it should be the deciding factor in how we handle dates, et.
> al.
>
> On Tue, 24 Jun 2003, Bruce Momjian wrote:
>
> >
> > We are actually considering not honoring locale for initdb encodings, so
> > it might make no sense to do this --- that another reason for the
> > question mark, but until we decide, it is an open issue.
> >
> > ---------------------------------------------------------------------------
> >
> > Lincoln Yeoh wrote:
> > > At 03:24 PM 6/23/2003 -0400, Bruce Momjian wrote:
> > >
> > > >Added to TODO, with question mark:
> > > >
> > > > * Have initdb set DateStyle based on locale?
> > >
> > > Given various issues with locale (indexes, ordering etc) I'd think that
> > > having a DB follow the O/S locale should be special case and require
> > > explicit configuration.
> > >
> > > More so if certain locales are significantly slower than others which
> > > seemed to be the case at least in recent memory.
> > >
> > > What if a European DB backed website is hosted on a US server with English,
> > > French and German data?
> > >
> > > If apps/programs are talking to DBs more than people are then it may make
> > > more sense to store things in an application friendly format e.g. (date =
> > > YYYY-MM-DD, or seconds since epoch) format and having the app convert it
> > > based on the user's preferences. After all even in English, apps may choose
> > > to display Tuesday as T, Tue, Tuesday, or whatever the Boss wants.
> > >
> > > Unless postgresql has special features allowing switching from one locale
> > > to another on the fly (including indexes, ordering etc) within a DB
> > > session, I'd rather stick to say the C locale, or whatever it is that's
> > > fastest.
> > >
> > > Another point of consideration: if someone accidentally loads
> > > multibyte/other locale data into a C locale DB (or whatever is chosen as
> > > default DB locale), would dumping the loaded data and reloading it into a
> > > multibyte locale result in information/precision loss?
> > >
> > > Link.
> > >
> > > ---------------------------(end of broadcast)---------------------------
> > > TIP 8: explain analyze is your friend
> > >
> >
> >
>
>

--
Bruce Momjian | http://candle.pha.pa.us
pgman(at)candle(dot)pha(dot)pa(dot)us | (610) 359-1001
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