ISDATE

The ISDATE program determines whether a text expression represents a valid date. ISDATE only tests a text expression to see if it can be converted to a DATE-only value; it does not actually make the conversion. You must use CONVERT to make the conversion.

Return Value

BOOLEAN

YES when the text expression represents a valid date; NO when it does not.

Syntax

ISDATE(test-date)

Arguments

test-date: A single-line ID or TEXT expression to be examined to see if it represents a valid date, as defined by the DATE-only data type. For a description of the valid styles for entering dates, see "Date-only Input Values".

Examples

Example 7-132 Testing a Text Expression

In the following statement, the ISDATE program tests a literal text expression to see if it is a valid date, and the output is sent to the current outfile.

SHOW ISDATE('3 5 1995')

This statement produces the following output.

YES