What kind of date format is "401769" and how can I get this formatted like a real date?

Question

What kind of date format is this and how can I get this formatted like a real date?

Expiredate="401769" 

Effectivedate="0" ModifiedWhen="39316.262472303242" CreatedWhen="38476.390116666669"

This is from Microsoft Content Management Server (MCMS) 2002 .sdo file (XML file exporting data)

Answer 1

DateTime.FromOADate(39316.262472303242) should get you the DateTime //gives 22/08/2007