date issue in excel

Hi everyone,
I'm using  CRM Online 2015 and since the last update 0.2 few days ago, I got an issue  with the function export to excel.
When I actualise the worksheet from the CRM the column with the creation date will change to another format.
Example:
19/03/2015 14:56 (Date and time) will be --> 42082.6224537037

Does anybody have a clue what I can do to fix this issue?

Thanks in Advance.