date calculation from Excel 1900 Format

Hi,

  During my conversion from Excel to XML, I needed to
convert dates.  Excel stores date in so called "1900
format", which is the number of days since 1/1/1900 in
decimal format, e.g. 37257.041667 for 1/1/2002 1AM.  I
need to convert this back to YYYY-MM-DD HH:MM:SS
format when I convert the Excel into XML.
  Has anyone did date conversion calculation, esp.
Excel 1900 format, with XSL?

Much thanks,
Xiaocun

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