How to convert “double” to “datetime” between Excel and c#

Question

I have a c# program which needs to create an excel object, and do some operations, here are parts of my code:

// c# code:

workSheet.Cells[1, 1] = \"=2012/9/20\         


        

Answer 1

Dude, your excel value is not a date. Drop the equal sign at the beginning.

Once you do that you will get a proper double value for your time (which can be converted via the OADate function). What your getting now is nonsense.