Date columns not acting as Date columns... across all my reports?

[sharpedogs]

I'm at a complete loss as to what to do next?

My date columns in my reports appear with a calendar beside them and the hierarcy applied as per the auto settings. When I put the date in an axes graph it acts as a date. The moment I try and use any DATE DAX they won't showup.

For example, when i try and use DATEDIFF neither of my start and or end date columns appear when i start to type them out. 

I am at a complete loss as to what to do next?

[CNENFRNL]

Hi, @sharpedogs , didn't you already in the Data view of Power BI to confirm the formats of the columns of interest?

[sharpedogs]

Hi,

As it turns out the messure i am using DATEDIFF needs to be created as a "new column". The Microsoft documentaion does not call that out.