Question

I have a cell in a spreadsheet that is a date object in Excel but becomes a double (something like 39820.0 for 1/7/2009) when it comes out of C1’s xls class. I read this is a Julian date format. Can someone tell me how to parse it back into a DateTime in C#?

Update: It looks like I might not have a Julian date, but instead the number of days since Dec 30, 1899.

Answer 1

I think Excel is just using the standard OLE Automation DATE type which can be converted with the DateTime.FromOADate method.

This block of code,

using System;  namespace DateFromDouble {     class Program     {         static void Main(string[] args)         {             Console.WriteLine(DateTime.FromOADate(39820.0));         }     } } 

outputs:

1/7/2009 12:00:00 AM