https://www.robertkaufman.com/js/js.helpers/jh.date.js?v=1474301668

1/*global jhInstance, jhRegex*/
2
3(function(jh){
4	'use strict';
5
6	var $this;
7
8	$this = jh.init(jh, 'date', {});
9
10	$this.f = function jhDate_f(date, format, options){
11
12		var ts = $this.tsMs(date)
13			, formats = $this.dateFormats
14			, options = options || null
15			;
16
17		if( ts === null ){ return null; }
18
19		format = format || 'm/d/Y';
20
21		if( formats[format] !== undefined ){ format = formats[format]; }
22
23		return typeof format === 'string' ? $this.date(format, ts) : format(ts, options);
24
25	};
26
27	$this.ts = function jhDate_ts(){
28
29		var ts = $this.tsMs.apply(this, arguments);
30
31		if( ts !== null ){ ts = Math.floor(ts/1000); }
32
33		return ts;
34
35	};
36
37	$this.tsMs = function jhDate_ts(date, def){
38
39		if( arguments.length === 0 ){ date = 'ts'; }
40
41		var ts = def || null
42			, dtype = typeof date
43			;
44
45		if( date === undefined || date === null || date === '' ){
46			return ts;
47		}
48
49		if( dtype === 'object' ){
50			ts = date.getTime();
51		}else if( dtype === 'string' ){
52			ts = $this.str2ts(date);
53		}else if( dtype === 'number' ){
54			ts = date;
55		}
56
57		return ts;
58
59	};
60
61	$this.change = function jhDate_change(date, change, mode){
62
63		mode = mode || 'date';
64
65		var ts = $this.tsMs(date);
66		if( ts === null ){ return null; }
67
68		date = $this.date('H/i/s/m/d/Y', ts).split('/');
69
70		if( mode === 'date' ){
71			date[4] = date[4] * 1 + change * 1;//change by days
72		}else if( mode === 'month' ){
73			date[3] = date[3] * 1 + change * 1;//change by months
74		}
75
76		ts = $this.mkts(date[0], date[1], date[2], date[3], date[4], date[5]);
77
78		return ts;
79
80	};
81
82	$this.mkts = function jhDate_mkts(hour, minute, second, month, day, year){
83
84		hour = hour * 1; minute = minute * 1; second = second * 1;
85		month = month * 1; day = day * 1; year = year * 1;
86
87		//hmmmmm, zero year?
88		if( year === 0 ){ return null; }
89
90		month--;//fix, js month starts from 0
91
92		return (new Date(year, month, day, hour, minute, second)).getTime();
93
94	};
95
96	$this.str2ts = function jhDate_str2ts(str){
97
98		if( str === 'now' ){ return $this.roundTs(new Date()); }
99		else if( str === 'ts' ){ return new Date().getTime(); }
100
101		var ts = null
102			, parsers = $this.str2tsParsers
103			, regex
104			;
105
106		str = str.replace(/[^\d]/g, '/');
107
108		for(regex in parsers){
109			if( !parsers.hasOwnProperty(regex) ){ continue; }
110
111			if( jhRegex.match(regex, str) ){
112				ts = parsers[regex](str);
113				break;
114			}
115
116		}
117
118		return ts;
119
120	};
121
122	$this.roundTs = function jhDate_roundTs(date, dir){
123
124		dir = dir || 'floor';
125
126		var ts = $this.tsMs(date);
127		if( ts === null ){ return null; }
128
129		if( typeof dir === 'array' ){
130			var
131				i, i_max, dir_i //for+
132				;
133			for(i = 0, i_max = dir.length; i < i_max; i++){
134				ts = roundTs(ts, dir[i]);
135			}
136			return ts;
137		}
138
139		date = $this.date('m/d/Y/t', ts).split('/');
140
141		if( dir === 'monthCeil' ){
142			date[1] = date[3];
143			dir = 'ceil';
144		}else if( dir == 'monthFloor' ){
145			date[1] = 1;
146			dir = 'floor';
147		}
148
149		if( dir === 'floor'){
150			ts = $this.mkts(0, 0, 0, date[0], date[1], date[2]);
151		}else if( dir === 'ceil' ){
152			ts = $this.mkts(23, 59, 59, date[0], date[1], date[2]);
153		}
154
155		return ts;
156
157	};
158
159	$this.compare = function jhDate_compare(date1, expr, date2, format){
160
161		format = format || 'Date';
162
163		var ts1 = $this.tsMs(date1)
164			, ts2 = $this.tsMs(date2)
165			, eq
166			;
167
168		if( ts1 === null || ts2 === null ){ return null; }
169		if( $this.f(ts1, format) === $this.f(ts2, format) ){
170			eq = 0;
171		}else{
172			eq = ts1 > ts2 ? 1 : -1;
173		}
174
175		if( expr === null ){
176		}else if( expr === '<' ){
177			eq = (eq === -1);
178		}else if( expr === '<=' ){
179			eq = (eq === -1 || eq === 0);
180		}else if( expr === '=' ){
181			eq = (eq === 0);
182		}else if( expr === '!=' ){
183			eq = (eq !== 0);
184		}else if( expr === '>' ){
185			eq = (eq === 1);
186		}else if( expr === '>=' ){
187			eq = (eq === 1 || eq === 0);
188		}else{
189			eq = null;
190		}
191
192		return eq;
193
194	};
195
196	$this.str2tsParsers = {
197		'/^[\\d]{2}\\/[\\d]{2}\\/[\\d]{4}$/': function(date){
198			//m/d/Y
199			date = date.split('/');
200			return $this.mkts(0, 0, 0, date[0], date[1], date[2]);
201		},
202		'/^[\\d]{4}\\/[\\d]{2}\\/[\\d]{2}$/': function(date){
203			//Y/m/d
204			date = date.split('/');
205			return $this.mkts(0, 0, 0, date[1], date[2], date[0]);
206		},
207		'/^[\\d]+$/': function(date){
208			//timestamp
209			return date * 1;
210		}
211	};
212
213	$this.dateFormats = {
214
215		Date: 'm/d/Y',
216		DateLong: 'F d, Y',
217
218		DateTime: 'm/d/Y H:i',
219		DateTimeLong: 'F d, Y H:i',
220
221		DateTime12: 'm/d/Y h:i A',
222		DateTime12Long: 'F d, Y h:i A',
223
224		DateTimeS: 'm/d/Y H:i:s',
225		DateTimeSLong: 'F d, Y H:i:s',
226
227		DateTimeS12: 'm/d/Y h:i:s A',
228		DateTimeS12Long: 'F d, Y h:i:s A',
229
230		Month: 'm/Y',
231		MonthLong: 'F, Y',
232
233		Obj: function(ts){ return new Date(ts); },
234
235		Ts: function(ts){ return ts; }
236
237	};
238
239	$this.date = function jhDate_date(format, ts){
240
241		var date = new Date(ts)
242			, letters = $this.date.letters
243			, formated = ""
244			;
245
246		var
247			i, i_max, format_i //for+
248			;
249		for(i = 0, i_max = format.length; i < i_max; i++){
250			format_i = format.charAt(i);
251			if( letters[format_i] === undefined ){
252				formated += format_i;
253			}else{
254				formated += letters[format_i](date) + '';
255			}
256		}
257
258		return formated;
259
260	};
261
262	$this.date.months = ["January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "

262November", "December"];
263	$this.date.months_short = ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'];
264	$this.date.addZero = function(number){ return number * 1 >= 10 ? number : '0' + number; };
265	$this.date.letters = {
266		A: function(date){ return date.getHours() > 11 ? "PM" : "AM"; },
267		d: function(date){ return $this.date.addZero(date.getDate()); },
268		F: function(date){ return $this.date.months[date.getMonth()]; },
269		M: function(date){ return $this.date.months_short[date.getMonth()]; },
270		H: function(date){ return $this.date.addZero(date.getHours()); },
271		h: function(date){ return $this.date.addZero(date.getHours % 12 || 12); },
272		i: function(date){ return $this.date.addZero(date.getMinutes()); },
273		m: function(date){ return $this.date.addZero(date.getMonth() + 1); },
274		s: function(date){ return $this.date.addZero(date.getSeconds()); },
275		Y: function(date){ return date.getFullYear(); },
276		t: function(date){ return (new Date(date.getFullYear(), date.getMonth() + 1, 0)).getDate(); },
277		z: function(date){

278			var year = date.getFullYear(), month = date.getMonth(), day = date.getDate()
279				, date1 = Date.UTC(year, 0, 1, 0, 0, 0) // noon on Jan. 1
280				, date2 = Date.UTC(year, month, day, 0, 0, 0) // noon on input date
281				;
282				if( (date2 - date1)/(86400 * 1000) != Math.floor((date2 - date1)/(86400 * 1000)) )
283			return Math.floor((date2 - date1)/(86400 * 1000));
284		}
285	};
286
287}(jhInstance));