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formatted-dates.html
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<html>
<head>
<title>Formatted dates in JavaScript</title>
<style type="text/css">
button {
width: 80px;
}
input {
width: 200px;
}
label {
display: inline-block;
margin-top: 10px;
width: 100px;
}
.format-letters {
float: left;
margin: 0;
width: 400px;
}
.format-letters label {
font-weight: bold;
width: 20px;
}
</style>
<script>
var dateLocale = {
"dayAbbr": ["Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"],
"dayFull": ["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"],
"monthAbbr": ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"],
"monthFull": ["January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"]
};
var formatOptions = {
"Y": {
"error": "Incorrect year",
"options": {"length": 4, "type": "int"},
"get": function (date) {
return ('0000' + date.getFullYear()).slice(-4);
},
"set": function (value, date) {
date.year = value;
}
},
"y": {
"error": "Incorrect year",
"options": {"length": 2, "type": "int"},
"get": function (date) {
return ('00' + date.getFullYear()).slice(-2);
},
"set": function (value, date) {
date.year = (value > 68) ? (value + 1900) : (value + 2000);
}
},
"m": {
"error": "Incorrect month",
"options": {"length": 2, "type": "int", "values": [1, 12]},
"get": function (date) {
return ('00' + (date.getMonth() + 1)).slice(-2);
},
"set": function (value, date) {
date.month = value - 1;
}
},
"n": {
"error": "Incorrect month",
"options": {"length": [1, 2], "type": "int", "values": [1, 12]},
"get": function (date) {
return date.getMonth() + 1;
},
"set": function (value, date) {
date.month = value - 1;
}
},
"F": {
"error": "Incorrect month",
"options": {"type": "indexOf", "values": dateLocale.monthFull},
"get": function (date) {
return this.options.values[date.getMonth()] || '';
},
"set": function (value, date) {
date.month = value;
}
},
"M": {
"error": "Incorrect month",
"options": {"type": "indexOf", "values": dateLocale.monthAbbr},
"get": function (date) {
return this.options.values[date.getMonth()] || '';
},
"set": function (value, date) {
date.month = value;
}
},
"d": {
"error": "Incorrect day",
"options": {"length": 2, "type": "int", "values": [1, 31]},
"get": function (date) {
return ('00' + date.getDate()).slice(-2);
},
"set": function (value, date) {
date.date = value;
}
},
"j": {
"error": "Incorrect day",
"options": {"length": [1, 2], "type": "int", "values": [1, 31]},
"get": function (date) {
return date.getDate();
},
"set": function (value, date) {
date.date = value;
}
},
"D": {
"error": "Incorrect day",
"options": {"type": "indexOf", "values": dateLocale.dayAbbr},
"get": function (date) {
return this.options.values[date.getDay()] || '';
}
},
"l": {
"error": "Incorrect day",
"options": {"type": "indexOf", "values": dateLocale.dayFull},
"get": function (date) {
return this.options.values[date.getDay()] || '';
}
},
"H": {
"error": "Incorrect hours in time",
"options": {"length": 2, "type": "int", "values": [0, 23]},
"get": function (date) {
return ('00' + date.getHours()).slice(-2);
},
"set": function (value, date) {
date.hours = value;
}
},
"h": {
"error": "Incorrect hours in time",
"options": {"length": 2, "type": "int", "values": [1, 12]},
"get": function (date) {
return ('00' + (date.getHours() % 12 + 1)).slice(-2);
},
"set": function (value, date) {
date.hours = value;
}
},
"G": {
"error": "Incorrect hours in time",
"options": {"length": [1, 2], "type": "int", "values": [0, 23]},
"get": function (date) {
return date.getHours();
},
"set": function (value, date) {
date.hours = value;
}
},
"g": {
"error": "Incorrect hours in time",
"options": {"length": [1, 2], "type": "int", "values": [1, 12]},
"get": function (date) {
return date.getHours() % 12;
},
"set": function (value, date) {
date.hours = value;
}
},
"i": {
"error": "Incorrect minutes in time",
"options": {"length": 2, "type": "int", "values": [0, 59]},
"get": function (date) {
return ('00' + date.getMinutes()).slice(-2);
},
"set": function (value, date) {
date.minutes = value;
}
},
"A": {
"error": "Incorrect AM/PM value in time",
"options": {"length": 2, "type": "indexOf", "values": ["AM", "PM"]},
"get": function (date) {
return date.getHours() === 0 || date.getHours() > 12 ? 'PM' : 'AM';
},
"set": function (value, date) {
date.pm = value ? true : false;
}
},
"a": {
"error": "Incorrect AM/PM value in time",
"options": {"length": 2, "type": "indexOf", "values": ["am", "pm"]},
"get": function (date) {
return date.getHours() === 0 || date.getHours() > 12 ? 'pm' : 'am';
},
"set": function (value, date) {
date.pm = value ? true : false;
}
}
};
/**
* Get part of date from string
* o = {
* "length": int or [min, max]
* "re": /^\d{2}/
* "type": "indexOf", "indexOfInts", "int"
* "values": ["Jan","Feb","Mar"...] or [min, max] for type:int
* }
* @param {string} s source date string
* @param {object} o options
* @returns {object} {"match", "value"}
*/
function getDatePart(s, o) {
o = o || {};
s = s + '';
// check against regular expression if set
if (o.re && !o.re.test(s)) {
return null;
}
// prepare length
if (o.length) {
// is single number
if (!Array.isArray(o.length) || o.length.length === 1) {
o.length = [parseInt(o.length), parseInt(o.length)];
}
// check max > min
if (o.length[1] && (o.length[1] < o.length[0])) {
o.length.sort();
}
} else {
o.length = [];
}
var i, v, vs;
switch (o.type) {
case 'indexOf':
if (o.values && o.values.length) {
v = s.toLowerCase();
o.length = [(o.length[0] || 1), (o.length[1] ? Math.min(o.length[1], v.length) : v.length)];
vs = o.values.slice(0).map(function (v) {
return v.toLowerCase();
});
for (i = o.length[1]; i >= o.length[0]; i--) {
if (vs.indexOf(v.substring(0, i)) !== -1) {
return {
"match": s.substring(0, i),
"value": vs.indexOf(v.substring(0, i))
};
}
}
}
return null;
case 'indexOfInts':
if (o.values) {
v = s.replace(/^(\d+).*/, '$1');
o.length = [(o.length[0] || 1), (o.length[1] ? Math.min(o.length[1], v.length) : v.length)];
vs = o.values.slice(0).map(function (v) {
return parseInt(v);
});
for (i = o.length[1]; i >= o.length[0]; i--) {
if (vs.indexOf(parseInt(v.substring(0, i))) !== -1) {
return {
"match": s.substring(0, i),
"value": vs.indexOf(parseInt(v.substring(0, i)))
};
}
}
}
return null;
case 'int':
v = s.replace(/^(\d+).*/, '$1');
for (i = o.length[1] ? Math.min(o.length[1], v.length) : v.length; i >= (o.length[0] || 1); i--) {
v = v.substring(0, i);
if (o.values) {
if (parseInt(v) >= (o.values[0] || 0) && (o.values[1] ? (parseInt(v) <= o.values[1]) : true)) {
return {
"match": s.substring(0, i),
"value": parseInt(v)
};
}
} else {
return {
"match": s.substring(0, i),
"value": parseInt(v)
};
}
}
return null;
}
return null;
}
/**
* Parse formatted date
*
* @param {string} dateString
* @param {string} dateFormat
* @returns {Date}
*/
function stringToDate(dateString, dateFormat) {
var d = new Date(2000, 0, 1);
var f = dateFormat.split('');
var n, o, p;
var v = {
"year": null,
"month": null,
"date": null,
"hours": null,
"minutes": null,
"pm": null
};
while (f.length) {
n = f.shift();
if (!(o = formatOptions[n])) {
if (n === '\\') {
n = f.shift();
}
o = {
"error": "Incorrect date: unknown character '" + n + "'",
"options": {"length": 1, "type": "indexOf", "values": n ? [n] : []}
};
}
if (!(p = getDatePart(dateString, o.options, n))) {
throw (o.error || "Incorrect date");
}
dateString = dateString.substring(p.match.length);
o.set && o.set(p.value, v);
}
// update hours if PM value is set
if (v.pm && v.hours != null && v.hours < 12) {
v.hours = (v.hours + 12) % 24;
}
if (v.year != null)
d.setFullYear(v.year);
if (v.month != null)
d.setMonth(v.month);
if (v.date != null)
d.setDate(v.date);
if (v.hours != null)
d.setHours(v.hours);
if (v.minutes != null)
d.setMinutes(v.minutes);
if ((v.year != null && d.getFullYear() !== v.year)
|| (v.month != null && d.getMonth() !== v.month)
|| (v.date != null && d.getDate() !== v.date)
|| (v.hours != null && d.getHours() !== v.hours)
|| (v.minutes != null && d.getMinutes() !== v.minutes)
) {
throw 'Incorrect date';
}
return d;
}
/**
*
* @param {Date} date
* @param {string} format
* @returns {string}
*/
function dateToString(date, dateFormat) {
var d = '', f = dateFormat.split(''), n, o;
while (f.length) {
n = f.shift();
if (o = formatOptions[n]) {
n = o.get(date);
}
if (n == '\\') {
n = f.shift() || '';
}
d += n;
}
return d;
}
</script>
</head>
<body>
<h1>Formatted dates in JavaScript</h1>
<p><a href="http://php.net/manual/en/function.date.php">Supported format letters</a></p>
<p class="format-letters">
<label>d</label> - Day of month [01-31] <br/>
<label>D</label> - Week day [Mon-Sun] <br/>
<label>j</label> - Day of month [1-31] <br/>
<label>l</label> - Week day [Monday - Sunday] <br/>
<label>F</label> - Month name [January - December] <br/>
<label>m</label> - Month number [01-12] <br/>
<label>M</label> - Month name [Jan - Dec] <br/>
<label>n</label> - Month number [1-12] <br/>
<label>Y</label> - Year [0000-9999] <br/>
<label>y</label> - Year [00-99] <br/>
<label>a</label> - Meridiem [am-pm] <br/>
<label>A</label> - Meridiem [AM-PM] <br/>
<label>g</label> - Hours [1-12] <br/>
<label>G</label> - Hours [0-23] <br/>
<label>h</label> - Hours [01-12] <br/>
<label>H</label> - Hours [00-23] <br/>
<label>i</label> - Minutes [00-59] <br/>
</p>
<h3>Convert from string to date</h3>
<p>
<label>Date:</label> <input id="date-from-string" value=""> <button id="set-date-from-string">Today</button><br/>
<label>Format:</label> <input id="format-from-string" value=""> <button id="convert-date-from-string">Convert</button><br/>
<label>Result (ISO):</label> <span id="result-from-string"></span>
</p>
<h3>Convert from date to string</h3>
<p>
<label>Date (ISO):</label> <input id="date-to-string" value=""> <button id="set-date-to-string">Today</button><br/>
<label>Format:</label> <input id="format-to-string" value=""> <button id="convert-date-to-string">Convert</button><br/>
<label>Result:</label> <span id="result-to-string"></span>
</p>
<script>
function e(id) {
return document.getElementById(id);
}
e('set-date-from-string').onclick = function () {
if (!e('format-from-string').value) {
e('format-from-string').value = 'F j, Y H:i';
}
e('date-from-string').value = dateToString(new Date(), e('format-from-string').value);
};
e('convert-date-from-string').onclick = function () {
try {
var date = e('date-from-string').value;
if (!date.replace(/^\s+|\s+$/g, '')) {
throw "Date field is empty";
}
var format = e('format-from-string').value;
if (!format.replace(/^\s+|\s+$/g, '')) {
throw "Format field is empty";
}
date = stringToDate(date, format);
e('result-from-string').innerHTML = date;
} catch (error) {
e('result-from-string').innerHTML = '<span style="color:red;">' + (error.message || error) + '</span>';
}
};
e('set-date-to-string').onclick = function () {
if (!e('format-to-string').value) {
e('format-to-string').value = 'F j, Y H:i';
}
e('date-to-string').value = dateToString(new Date(), e('format-to-string').value);
};
e('convert-date-to-string').onclick = function () {
try {
var date = e('date-to-string').value;
if (!date.replace(/^\s+|\s+$/g, '')) {
throw "Date field is empty";
}
var format = e('format-to-string').value;
if (!format.replace(/^\s+|\s+$/g, '')) {
throw "Format field is empty";
}
date = dateToString(new Date(date), format);
e('result-to-string').innerHTML = date;
} catch (error) {
e('result-to-string').innerHTML = '<span style="color:red;">' + (error.message || error) + '</span>';
}
};
// hacks for IE < 9 or quirks mode
if (!Array.isArray) {
Array.isArray = function (arg) {
return Object.prototype.toString.call(arg) === '[object Array]';
};
}
if (!Array.prototype.map) {
Array.prototype.map = function (callback, thisArg) {
var T, A, k;
if (this == null) {
throw new TypeError(' this is null or not defined');
}
var O = Object(this);
var len = O.length >>> 0;
if (typeof callback !== 'function') {
throw new TypeError(callback + ' is not a function');
}
if (arguments.length > 1) {
T = thisArg;
}
A = new Array(len);
k = 0;
while (k < len) {
var kValue, mappedValue;
if (k in O) {
kValue = O[k];
mappedValue = callback.call(T, kValue, k, O);
A[k] = mappedValue;
}
k++;
}
return A;
};
}
if (!Array.prototype.indexOf) {
Array.prototype.indexOf = function (searchElement, fromIndex) {
var k;
if (this == null) {
throw new TypeError('"this" is null or not defined');
}
var O = Object(this);
var len = O.length >>> 0;
if (len === 0) {
return -1;
}
var n = +fromIndex || 0;
if (Math.abs(n) === Infinity) {
n = 0;
}
if (n >= len) {
return -1;
}
k = Math.max(n >= 0 ? n : len - Math.abs(n), 0);
while (k < len) {
var kValue;
if (k in O && O[k] === searchElement) {
return k;
}
k++;
}
return -1;
};
}
</script>
</body>
</html>