Date populated check

Hi...

I have a list of Account Numbers and Date of Births in a file with 1000s of Rows, having 2 date formats.
I need to create a New Column called "Actual or Not Populated" , flagging the "Actual DOB" and "Not Populated DOB" values.

What formula would work if I was to create this 3rd column, to check these date values?


Account No., DOB, Actual or Not Populated?

T65M21D969R, 1965-08-21, Actual DOB
T65H08I580E, 1965-06-08, Actual DOB
D69C03C034A, 0001-01-01 00:00:00.0, Not Populated DOB
N54E30L298F, 0001-01-01 00:00:00.0, Not Populated DOB

Thanks guys..