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Valid_Date
Purpose Validates a date string.
Decln. Valid_date(Indate:string;format:byte):boolean;
Returns Boolean
Remarks Indate is the string to be validated.
Format is the format code to indicate the format of the string.
The valid date formats are declared as constants in the MiscTTT5
unit:
DDMMYY
MMDDYY
MMYY
MMYYYY
DDMMYYYY
MMDDYYYY
The procedure checks that the month is valid (i.e. in the range
1..12) and that the day is within the valid range for the month.
Leap years are accounted for.
Example
VAR
OK : BOOLEAN;
BEGIN
OK := VALID_DATE('02/31/90',MMDDYY);
END;
The variable OK is assigned the value FALSE because there are not 31 days
in February 1990.
See Also:
Date_to_Julian
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