Validating ISO date

Using the ISDATE function is not enough for validating the ISO date YYYYMMDD.  Checking the length can help.

ISDATE(@byymd) = 1 AND LEN(CAST(@byymd AS VARCHAR)) = 8

http://stackoverflow.com/questions/6651007/how-to-check-whether-varchar-is-a-valid-iso-date-112

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