Finding thing errors quickly in a huge column

S

Scott

OK guys. I have a column with 20,000 dates in. They should all be in
the format that is DD/MM/YYYY, but some times people have only put days
and months and occasionally random characters are in there too.

Is there a formula to search for cells in column A that are not
DD/MM/YYYY? I have tried using autofilter and stuff but that is not
very quick.

Many thanks gang!
 
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