Re: Date field's and their file space usage.

[Reeve <rfritchman@xxxxxxxxx>]

Probably because the math for leap years, and other date adjustments
fits when that number is used.  There's a size issue as well.

It would be interesting to learn how someone came up with that
specific date...musta been a nasty DOU!

-reeve


On Tue, 11 Jan 2005 12:22:12 -0800, Tony Carolla <carolla@xxxxxxxxx> wrote:
> I find date storage a fascinating topic!  This is interesting, because
> it would seem that the earliest date available (even though only used
> in a 'scholarly' sense), would be 0001-01-01, or January 1, 0001.  If
> the Scaliger numbers go back to, basically January 1, -4713, then why
> don't the allowed values for a Date field go back that far?
> 
> 
> On Tue, 11 Jan 2005 13:01:29 -0600, Bruce Vining <bvining@xxxxxxxxxx> wrote:
> >
> >
> > > Date fields are all stored internally as a 4-byte integer. The value
> > stored
> > > is the number of days since January 1, 0001 or October 14, 1582, I'm not
> > > sure which it is.
> >
> > A minor point but date fields are actually stored using Scaliger numbers
> > which have a base of January 1 4713 BCE.
> >
> > October 14 1582 is the base date for Lilian numbers which are used by the
> > ILE CEE Date APIs.
> >
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