There are a set of UDF's you can download to do this. I like Alan
Campin's idate. It is available at

Your sample is pretty easy. Someone has to pass in a timestamp. Therefore
it already has to be valid. They can't pass you '2015-02-31-25.13.13'.
However, they can pass you a null value.

Validity checking, null values, etc, are all handled in idate. And it
costs nothing.

Rob Berendt

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