@ Pecoflyer
If I were you I should read the question again.
The OP has written "I want to flag duplicate dates somehow" & "If I enter 03/18/10 in oh, let's say cell D-59". Has he said that he wants to reference D59 all the time!! I think not.
Rightly or wrongly, the OP has requested that there is some kind of warning that if he enters a date in column D that already exist then flag them. so what you are suggesting, is the answer I come up with will not work. Is that correct!!
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