I have a table with two columns in it
ExportDate: 2006-09-20 17:10:00Z
CreationDate:2006-09-12 13:21:00Z

I want to create a another column containing the time taken from
Creation to Export of a product

I created a named calculation called Averagetime and wrote the
following expression in
ExportDate-CreationDate

However I'm getting time correct but the difference in the date is
incorrect It shows the following result.

Averagetime: 1900-01-09 03:49:00Z

Can u please help

Thanks