# \[AS2\] Quick and easy Date Validation

**URL:** <https://forum.kirupa.com/t/as2-quick-and-easy-date-validation/267012>\
**Category:** open source\
**Created:** [July 27, 2008, 1:14pm UTC](https://forum.kirupa.com/t/as2-quick-and-easy-date-validation/267012 "2008-07-27T13:14:54Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![glosrfc](https://yyz1.discourse-cdn.com/flex011/user_avatar/forum.kirupa.com/glosrfc/32/8334_2.png) [@glosrfc](https://forum.kirupa.com/u/glosrfc)\
**Post date:** [July 27, 2008, 1:14pm UTC](https://forum.kirupa.com/t/as2-quick-and-easy-date-validation/267012/1 "2008-07-27T13:14:54Z")

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**isValidDate Function**  
Simply checks if a valid date has been entered and returns true or false.  
There’s no need for a whole heap of conditional statements and string manipulation because the Date object will validate itself.

**ARGUMENTS:**  
[COLOR=“Red”]day [/COLOR]- the day to check  
[COLOR=“red”]month[/COLOR] - the month to check  
[COLOR=“red”]year[/COLOR] - the year to check

**RETURNS:**  
[COLOR=“red”]Boolean[/COLOR] - True if year, month, and day are valid; otherwise it returns False

```auto
function isValidDate(day, month, year):Boolean {
	var d:Date = new Date(year, --month, day);
	return d.getDate() == day && d.getMonth() == month && d.getFullYear() == year;
}

```

**Sample Use:**

```auto
trace("Checking 31/3/2008: " + isValidDate(31, 3, 2008)); // true
trace("Checking 31/4/2008: " + isValidDate(31, 4, 2008)); // false
trace("Checking 30/2/2008: " + isValidDate(30, 2, 2008)); // false
trace("Checking 29/2/2007: " + isValidDate(29, 2, 2007)); // false
trace("Checking 29/2/2008: " + isValidDate(29, 2, 2008)); // true
trace("Checking 32/3/2008: " + isValidDate(32, 3, 2008)); // false
trace("Checking 31/13/2008: " + isValidDate(31, 13, 2008)); // false

```

If you still like manipulating strings, and want to validate the correct use of date delimiters, you can do so quite easily by first splitting the date into an array and then checking against each index. The function will continue to return true or false, as this example demonstrates:

```auto
var date_str:String = "28/2/2008";
var date_arr:Array = date_str.split("/");
trace(isValidDate(date_arr[0],date_arr[1],date_arr[2])); // true
var date_str:String = "28-2-2008";
var date_arr:Array = date_str.split("/");
trace(isValidDate(date_arr[0],date_arr[1],date_arr[2])); // false

```

Finally, the function can also validate dates that are entered in a different format, e.g. for US-style dates (mm/dd/yyyy) just swap the order of the function arguments:

```auto
function isValidDate(month, day, year) {

```

---

<div class="post-metadata">

**Author:** ![Digitalosophy](https://yyz1.discourse-cdn.com/flex011/user_avatar/forum.kirupa.com/digitalosophy/32/1114_2.png) [@Digitalosophy](https://forum.kirupa.com/u/Digitalosophy)\
**Post date:** [July 27, 2008, 3:14pm UTC](https://forum.kirupa.com/t/as2-quick-and-easy-date-validation/267012/2 "2008-07-27T15:14:35Z")

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Nice man, useful for sure