---
url: >-
  /statelake/scripting-reference/functions-and-procedures/datetime-functions/isvaliddate.md
---

# IsValidDate

**IsValidDate** returns **True** if the given date parts would return a valid date.

* **AYear** must be within the range of 1 through 9999 inclusive.
* **AMonth** must be within the range of 1 through 12 inclusive.
* **ADay** must fall within the range of 1 through to 31 - depending on the total number of days in **AMonth**.

If any one of these three (3) parameter range constraints is not met, then **IsValidDate** returns **False**.

This function is useful for testing date parts prior to passing them to the **EncodeDateTime** function.

Declaration: function IsValidDate(const AYear: Word; const AMonth: Word; const ADay: Word): Boolean;

An example of its use follows.

```pascal
procedure OnMapEvent(var Value:Variant);
var
  vReal, vReal2 ; boolean;
begin
 //Returns true if the given date parts would create a valid date

  vReal := IsValidDate(2009, 06, 25);                    //VALID
 if vReal = True then
    loginfo('vReal date is valid.')
 else
    LogInfo('vReal date is not valid.');

  vReal2 := IsValidDate(2024, 02, 30);                   //INVALID
 if vReal2 = True then
    loginfo('vReal2 date is valid.')
 else
    LogInfo('vReal2 date is not valid.');

  LogInfo('');
end;
```