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IsDate
Gives a Boolean value specifying whether an expression can be converted to a date
IsDate(expression)
The expression argument can be any date or string expression recognizable as a date or time.
IsDate returns True if the expression is a date or can be converted to a valid date; otherwise, it returns False. In Microsoft Windows, the range of valid dates is January 1, 100 A.D. through December 31, 9999 A.D.; the ranges vary among operating systems.
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