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ISDATE String Function

Use:Determines if the provided parameter is a valid date.
Syntax:
{ISDATE(<<date>>)} 
Arguments:

<<date>>
    Date is either a date field or a string in the format "YYYYMMDD"
Returns:1 = If the input is valid date

0 = If the input is not valid date

Example:

{table.date_field} = "08/39/2016"
{ISDATE(table.date_field)}

Result: 0

ISDATE String Function