Re: date calculation from Excel 1900 Format

Hi, Goetz:

  Thanks for the offer to help, much appreciated.
  I could not seems to find an established algorithm
to derive date from the "1900 format", I would be much
appreciate if anyone has seen one.
  The way I thought I might want to approach it (if I
need to build my own) would be:
Assume t as total number of dates since 1/1/1900
1. find divisor and remainder of t/(366+365+365+365). 
This is scope t down to a 4-years span including a
leap year.
2. with the remainder, minus 366,365,365,365 in that
order until result is negative, that scopes t to a
particular year.
3. with the last positive remainder, remove number of
days from each month starting with 31 days in Jan. to
scope t into a particular month, and eventually
particular day within the month.
  As you can see, it is not pretty, and not completely
correct.  The correct way to count leap year is 1 in
every 4, except every 100 and include every 400.  But
I only care recent days and therefore this minor
mistake can be ignored.
  Is there any simpler algorithm?

Much thanks,
Xiaocun



--- Goetz Bock <bock@xxxxxxxxxxx> wrote:
> 
> On Mon, Jun 11 '01 at 11:50, Xiaocun Xu wrote:
> >   Has anyone did date conversion calculation, esp.
> > Excel 1900 format, with XSL?
> Do you happen to have a conversion algorithm in any
> other programming
> language, or even an informal description?
> 
> I don't have the time to search the web for a
> conversion algorithm, but
> I will help you to transfer it to XSLT.
> 
>     Goetz.
> 

> ATTACHMENT part 2 application/pgp-signature 



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