https://academy.hpa-faip.it/js/dateformat.js

1/*
2 * Date Format 1.2.3
3 * (c) 2007-2009 Steven Levithan <stevenlevithan.com>
4 * MIT license
5 *
6 * Includes enhancements by Scott Trenda <scott.trenda.net>
7 * and Kris Kowal <cixar.com/~kris.kowal/>
8 *
9 * Accepts a date, a mask, or a date and a mask.
10 * Returns a formatted version of the given date.
11 * The date defaults to the current date/time.
12 * The mask defaults to dateFormat.masks.default.
13 */
14
15var dateFormat = function () {
16	var	token = /d{1,4}|m{1,4}|yy(?:yy)?|([HhMsTt])\1?|[LloSZ]|"[^"]*"|'[^']*'/g,
17		timezone = /\b(?:[PMCEA][SDP]T|(?:Pacific|Mountain|Central|Eastern|Atlantic) (?:Standard|Daylight|Prevailing) Time|(?:GMT|UTC)(?:[-+]\d{4})?)\b/g,
18		timezoneClip = /[^-+\dA-Z]/g,
19		pad = function (val, len) {
20			val = String(val);
21			len = len || 2;
22			while (val.length < len) val = "0" + val;
23			return val;
24		};
25
26	// Regexes and supporting functions are cached through closure
27	return function (date, mask, utc) {
28		var dF = dateFormat;
29
30		// You can't provide utc if you skip other args (use the "UTC:" mask prefix)
31		if (arguments.length == 1 && Object.prototype.toString.call(date) == "[object String]" && !/\d/.test(date)) {
32			mask = date;
33			date = undefined;
34		}
35
36		// Passing date through Date applies Date.parse, if necessary
37		date = date ? new Date(date) : new Date;
38		if (isNaN(date)) throw SyntaxError("invalid date");
39
40		mask = String(dF.masks[mask] || mask || dF.masks["default"]);
41
42		// Allow setting the utc argument via the mask
43		if (mask.slice(0, 4) == "UTC:") {
44			mask = mask.slice(4);
45			utc = true;
46		}
47
48		var	_ = utc ? "getUTC" : "get",
49			d = date[_ + "Date"](),
50			D = date[_ + "Day"](),
51			m = date[_ + "Month"](),
52			y = date[_ + "FullYear"](),
53			H = date[_ + "Hours"](),
54			M = date[_ + "Minutes"](),
55			s = date[_ + "Seconds"](),
56			L = date[_ + "Milliseconds"](),
57			o = utc ? 0 : date.getTimezoneOffset(),
58			flags = {
59				d:    d,
60				dd:   pad(d),
61				ddd:  dF.i18n.dayNames[D],
62				dddd: dF.i18n.dayNames[D + 7],
63				m:    m + 1,
64				mm:   pad(m + 1),
65				mmm:  dF.i18n.monthNames[m],
66				mmmm: dF.i18n.monthNames[m + 12],
67				yy:   String(y).slice(2),
68				yyyy: y,
69				h:    H % 12 || 12,
70				hh:   pad(H % 12 || 12),
71				H:    H,
72				HH:   pad(H),
73				M:    M,
74				MM:   pad(M),
75				s:    s,
76				ss:   pad(s),
77				l:    pad(L, 3),
78				L:    pad(L > 99 ? Math.round(L / 10) : L),
79				t:    H < 12 ? "a"  : "p",
80				tt:   H < 12 ? "am" : "pm",
81				T:    H < 12 ? "A"  : "P",
82				TT:   H < 12 ? "AM" : "PM",
83				Z:    utc ? "UTC" : (String(date).match(timezone) || [""]).pop().replace(timezoneClip, ""),
84				o:    (o > 0 ? "-" : "+") + pad(Math.floor(Math.abs(o) / 60) * 100 + Math.abs(o) % 60, 4),
85				S:    ["th", "st", "nd", "rd"][d % 10 > 3 ? 0 : (d % 100 - d % 10 != 10) * d % 10]
86			};
87
88		return mask.replace(token, function ($0) {
89			return $0 in flags ? flags[$0] : $0.slice(1, $0.length - 1);
90		});
91	};
92}();
93
94// Some common format strings
95dateFormat.masks = {
96	"default":      "ddd mmm dd yyyy HH:MM:ss",
97	shortDate:      "m/d/yy",
98	mediumDate:     "mmm d, yyyy",
99	longDate:       "mmmm d, yyyy",
100	fullDate:       "dddd, mmmm d, yyyy",
101	shortTime:      "h:MM TT",
102	mediumTime:     "h:MM:ss TT",
103	longTime:       "h:MM:ss TT Z",
104	isoDate:        "yyyy-mm-dd",
105	isoTime:        "HH:MM:ss",
106	isoDateTime:    "yyyy-mm-dd'T'HH:MM:ss",
107	isoUtcDateTime: "UTC:yyyy-mm-dd'T'HH:MM:ss'Z'"
108};
109
110// Internationalization strings
111dateFormat.i18n = {
112	dayNames: [
113		"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat",
114		"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"
115	],
116	monthNames: [
117		"Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec",
118		"January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "

118November", "December"
119	]
120};
121
122// For convenience...
123Date.prototype.format = function (mask, utc) {
124	return dateFormat(this, mask, utc);
125};