How can I set this up?

If Column A is blank then no date can be added to Column B;

If there is a date in Column A then Column B must be equal to or
greater (=) than Column A

Seems like it should be easy enough but I can't get it to work.

Thanks!


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patam
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Select Cell B1

On Menu Bar, select Data Validation

Settings:
Allow Custom
Ignore Blank not checked
Formula should be =AND(A1<"",B1A1)


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DCSwearingen


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One way:

Data/Validation/ Allow Custom:

=AND(A1<"",B1=A1)

uncheck the Ignore blank checkbox.

In article ,
patam wrote:

How can I set this up?

If Column A is blank then no date can be added to Column B;

If there is a date in Column A then Column B must be equal to or
greater (=) than Column A

Seems like it should be easy enough but I can't get it to work.

Thanks!