Calculated KF issue

Hello experts,

I have created a CKF which is giving me this result for all lines: -2.345678901E+298 .

I created formula variable for both dates and changed to display 0 as number of decimals. See below CKF:

DATE ( 'Posting date' ) - DATE ( 'Requisition date' )

Please can someone tell me what is wrong with it and also what could be my alternative to subtract to dates?

Thanks for your help.

Cesar