RD
Uncheck the ignore blank box then it worked for me
HTH

"RagDyeR" wrote:

Doesn't work for me Bob, and I'll be darned ... I can't figure out why or
what else to use?!?!

*Can't* stop B from accepting input when A is blank.

Does it work on your box?
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Regards,

RD
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"Bob Phillips" wrote in message
...
Use data validation with a custom formula of

=AND(A2<"", B2=A2)

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HTH

RP
(remove nothere from the email address if mailing direct)


"patam" wrote in
message ...

I need to make sure that the date entered in column B is equal to or
greater than column A and that no date can be entered in "b" if "a" is
blank


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patam
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