JavaScript Date Validation

Feb 8, 2003

Recently while messing with dates, I noticed an odd quirk in javascript with new Date(), i.e. if someone enters an invalid date, such as 2/29/2003, javascript creates the new date as 3/1/2003.

Having a look around, I couldn't find any scripts that took advantage of this for the sake of date validation... probably someone here has done this before, but I'll post it anyway.

The idea is that if javascript creates a new Date() with a different month, then obviously the date entered is not valid. Most of the scripts I saw used some math to divide by leap year, yadda yadda yadda, but with this feature (?) of javascript, it seems unnecessary.

Right now this code only validates mm/dd/yyyy, but it should be easy to modify to support other formats:

function isDate(sDate) {
var re = /^d{1,2}/d{1,2}/d{4}$/
if (re.test(sDate)) {
var dArr = sDate.split("/");
var d = new Date(sDate);
return d.getMonth() + 1 == dArr[0] && d.getDate() == dArr[1] && d.getFullYear() == dArr[2];
else {
return false;

Here's a shorter version that works if you pass in the values separately:

function isDate(mm,dd,yyyy) {
var d = new Date(mm + "/" + dd + "/" + yyyy);
return d.getMonth() + 1 == mm && d.getDate() == dd && d.getFullYear() == yyyy;

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It has appeared that ancient sources give a method for Numeric Date
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versions are often posted by incomers here. That sort of code seems
unnecessarily long.

For some while, the following approach has been given here :-

function ValidDate(y, m, d) { // m = 0..11 ; y m d integers, y!=0
with (new Date(y, m, d))
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and it may remain the shortest code. But it does require, in every
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The following is about 50% longer in code, but about four times faster
in my system - and it seems to be right, too.

function DateOK(Y, M, D) {
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Note that checking for 1 <= M <= 12 is inherent, and that the Leapness
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I have a form input that takes a date in the format MM/DD/YYYY.

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2. I need to also check that the 'MM/DD/YYYY' being input is later than today + 2 days (i.e. if today is 12/27/07, then the input must be 12/29/07 or greater)

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month = todaysDate.getMonth();
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The second script needs to run on 5 other date fields as an onblur call - BUT - I need this to also validate that the date entered is an older date that the "today's date" referred to in the above script. EX: the form is being sent on 12/5/05. the expdate below needs to be 12/6/05 or later. Code:

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Oh, and the date() function is described here:

Date.prototype.monthNames = new Array(
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for (var i = 0; i < heap.length; i++) {
switch(heap[i]) {
case escapeChar:
resHeap[i] = heap[i+1];

case "a": // "am" or "pm"
var temp = this.getHours();
resHeap[i] = (temp < 12) ? "am" : "pm";

case "A": // "AM" or "PM"
var temp = this.getHours();
resHeap[i] = (temp < 12) ? "AM" : "PM";

case "d": // day of the month, 2 digits with leading zeros; i.e. "01" to "31"
var temp = String(this.getDate());
resHeap[i] = (temp.length > 1) ? temp : "0" + temp;

case "D": // day of the week, textual, 3 letters; i.e. "Fri"
var temp = this.dayNames[this.getDay()];
resHeap[i] = temp.substring(0, 3);

case "F": // month, textual, long; i.e. "January"
resHeap[i] = this.monthNames[this.getMonth()];

case "g": // hour, 12-hour format without leading zeros; i.e. "1" to "12"
var temp = this.getHours();
resHeap[i] = (temp <= 12) ? temp : (temp - 12);

case "G": // hour, 24-hour format without leading zeros; i.e. "0" to "23"
resHeap[i] = String(this.getHours());

case "h": // hour, 12-hour format; i.e. "01" to "12"
var temp = String(this.getHours());
temp = (temp <= 12) ? temp : (temp - 12);
resHeap[i] = (temp.length > 1) ? temp : "0" + temp;

case "H": // hour, 24-hour format; i.e. "00" to "23"
var temp = String(this.getHours());
resHeap[i] = (temp.length > 1) ? temp : "0" + temp;

case "i": // minutes; i.e. "00" to "59"
var temp = String(this.getMinutes());
resHeap[i] = (temp.length > 1) ? temp : "0" + temp;

case "I": // "1" if Daylight Savings Time, "0" otherwise. Works only on the northern hemisphere
var firstDay = new Date(this.getFullYear(), 0, 1);
resHeap[i] = (this.getTimezoneOffset() != firstDay.getTimezoneOffset()) ? (1) : (0);

case "J": // day of the month without leading zeros; i.e. "1" to "31"
resHeap[i] = this.getDate();

case "l": // day of the week, textual, long; i.e. "Friday"
resHeap[i] = this.dayNames[this.getDay()];

case "L": // boolean for whether it is a leap year; i.e. "0" or "1"
resHeap[i] = (this.getFullYear() % 4) ? false : true;

case "m": // month; i.e. "01" to "12"
var temp = String(this.getMonth() + 1);
resHeap[i] = (temp.length > 1) ? temp : "0" + temp;

case "M": // month, textual, 3 letters; i.e. "Jan"
resHeap[i] = this.monthNames[this.getMonth()];

case "n": // month without leading zeros; i.e. "1" to "12"
resHeap[i] = this.getMonth() + 1;

case "O": // Difference to Greenwich time in hours; i.e. "+0200"
var minZone = this.getTimezoneOffset();
var mins = minZone % 60;
var hour = String(((minZone - mins) / 60) * -1);

if (hour.charAt(0) != "-") {
hour = "+" + hour;

hour = (hour.length == 3) ? (hour) : (hour.replace(/([+-])(d)/, "$1" + 0 + "$2"));
resHeap[i] = hour + mins + "0";

case "r": // RFC 822 formatted date; e.g. "Thu, 21 Dec 2000 16:01:07 +0200"
var dayName = this.dayNames[this.getDay()].substr(0, 3);
var monthName = this.monthNames[this.getMonth()].substr(0, 3);
resHeap[i] = dayName + ", " + this.getDate() + " " + monthName + this.format(" Y H:i:s O");

case "s": // seconds; i.e. "00" to "59"
var temp = String(this.getSeconds());
resHeap[i] = (temp.length > 1) ? temp : "0" + temp;

case "S": // English ordinal suffix for the day of the month, 2 characters; i.e. "st", "nd", "rd" or "th"
var temp = this.getDate();
var suffixes = ["st", "nd", "rd"];
var suffix = "";

if (temp >= 11 && temp <= 13) {
resHeap[i] = "th";
} else {
resHeap[i] = (suffix = suffixes[String(temp).substr(-1) - 1]) ? (suffix) : ("th");

case "t": // number of days in the given month; i.e. "28" to "31"
resHeap[i] = this.getDay();

* T: Not implemented

case "U": // seconds since the Unix Epoch (January 1 1970 00:00:00 GMT)
// remember that this does not return milisecs!
resHeap[i] = Math.floor(this.getTime() / 1000);

case "w": // day of the week, numeric, i.e. "0" (Sunday) to "6" (Saturday)
resHeap[i] = this.getDay();

case "W": // ISO-8601 week number of year, weeks starting on Monday
var startOfYear = new Date(this.getFullYear(), 0, 1, 0, 0, 0, 0);
var firstDay = startOfYear.getDay() - 1;

if (firstDay < 0) {
firstDay = 6;

var firstMonday = Date.UTC(this.getFullYear(), 0, 8 - firstDay);
var thisDay = Date.UTC(this.getFullYear(), this.getMonth(), this.getDate());
resHeap[i] = Math.floor((thisDay - firstMonday) / (1000 * 60 * 60 * 24 * 7)) + 2;

case "y": // year, 2 digits; i.e. "99"
resHeap[i] = String(this.getFullYear()).substring(2);

case "Y": // year, 4 digits; i.e. "1999"
resHeap[i] = this.getFullYear();

case "z": // day of the year; i.e. "0" to "365"
var firstDay = Date.UTC(this.getFullYear(), 0, 0);
var thisDay = Date.UTC(this.getFullYear(), this.getMonth(), this.getDate());
resHeap[i] = Math.floor((thisDay - firstDay) / (1000 * 60 * 60 * 24));

case "Z": // timezone offset in seconds (i.e. "-43200" to "43200").
resHeap[i] = this.getTimezoneOffset() * 60;

resHeap[i] = heap[i];

// return joined array
return resHeap.join("");

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