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Excel AddIn, C#, UDF,
MyUDF calls a web service to retrieve certain date. Sometimes the date returned is not in range of Jan-1-1900 to Dec-31-9999 (Excel Date Range). E.g. in one case returned date is Jan-2-0002 (valid in C# but not valid in Excel), then Excel crashes. I do not hard code “Jan-1-1900”, so wonder if there is a way that I can get it programmatically. thanks
Inside Excel, convert the date corresponding to
1into a string that you can parse:which should give you 01-01-1900 or 02-01-1904 depending on the date system chosen (hat tip to barrowc!). Note how the date systems don’t only differ by four years but also by the fact that in one case the value 1 corresponds to January 1st (in 1900) and in the other it is 0 which corresponds to January 1st (in 1904). For a given Workbook, the Workbook.Date1904 Property can tell you which date system is being used.