javascript 日期格式化【转】

001    /*
002     * Date Format 1.2.3
003     * (c) 2007-2009 Steven Levithan <stevenlevithan.com>
004     * MIT license
005     *
006     * Includes enhancements by Scott Trenda <scott.trenda.net>
007     * and Kris Kowal <cixar.com/~kris.kowal/>
008     *
009     * Accepts a date, a mask, or a date and a mask.
010     * Returns a formatted version of the given date.
011     * The date defaults to the current date/time.
012     * The mask defaults to dateFormat.masks.default.
013     */
014     
015    var dateFormat = function () {
016        var token = /d{1,4}|m{1,4}|yy(?:yy)?|([HhMsTt])\1?|[LloSZ]|"[^"]*"|'[^']*'/g,
017            timezone = /\b(?:[PMCEA][SDP]T|(?:Pacific|Mountain|Central|Eastern|Atlantic) (?:Standard|Daylight|Prevailing) Time|(?:GMT|UTC)(?:[-+]\d{4})?)\b/g,
018            timezoneClip = /[^-+\dA-Z]/g,
019            pad = function (val, len) {
020                val = String(val);
021                len = len || 2;
022                while (val.length < len) val = "0" + val;
023                return val;
024            };
025     
026        // Regexes and supporting functions are cached through closure
027        return function (date, mask, utc) {
028            var dF = dateFormat;
029     
030            // You can't provide utc if you skip other args (use the "UTC:" mask prefix)
031            if (arguments.length == 1 && Object.prototype.toString.call(date) == "[object String]" && !/\d/.test(date)) {
032                mask = date;
033                date = undefined;
034            }
035     
036            // Passing date through Date applies Date.parse, if necessary
037            date = date ? new Date(date) : new Date;
038            if (isNaN(date)) throw SyntaxError("invalid date");
039     
040            mask = String(dF.masks[mask] || mask || dF.masks["default"]);
041     
042            // Allow setting the utc argument via the mask
043            if (mask.slice(0, 4) == "UTC:") {
044                mask = mask.slice(4);
045                utc = true;
046            }
047     
048            var _ = utc ? "getUTC" : "get",
049                d = date[_ + "Date"](),
050                D = date[_ + "Day"](),
051                m = date[_ + "Month"](),
052                y = date[_ + "FullYear"](),
053                H = date[_ + "Hours"](),
054                M = date[_ + "Minutes"](),
055                s = date[_ + "Seconds"](),
056                L = date[_ + "Milliseconds"](),
057                o = utc ? 0 : date.getTimezoneOffset(),
058                flags = {
059                    d:    d,
060                    dd:   pad(d),
061                    ddd:  dF.i18n.dayNames[D],
062                    dddd: dF.i18n.dayNames[D + 7],
063                    m:    m + 1,
064                    mm:   pad(m + 1),
065                    mmm:  dF.i18n.monthNames[m],
066                    mmmm: dF.i18n.monthNames[m + 12],
067                    yy:   String(y).slice(2),
068                    yyyy: y,
069                    h:    H % 12 || 12,
070                    hh:   pad(H % 12 || 12),
071                    H:    H,
072                    HH:   pad(H),
073                    M:    M,
074                    MM:   pad(M),
075                    s:    s,
076                    ss:   pad(s),
077                    l:    pad(L, 3),
078                    L:    pad(L > 99 ? Math.round(L / 10) : L),
079                    t:    H < 12 ? "a"  : "p",
080                    tt:   H < 12 ? "am" : "pm",
081                    T:    H < 12 ? "A"  : "P",
082                    TT:   H < 12 ? "AM" : "PM",
083                    Z:    utc ? "UTC" : (String(date).match(timezone) || [""]).pop().replace(timezoneClip, ""),
084                    o:    (o > 0 ? "-" : "+") + pad(Math.floor(Math.abs(o) / 60) * 100 + Math.abs(o) % 60, 4),
085                    S:    ["th", "st", "nd", "rd"][d % 10 > 3 ? 0 : (d % 100 - d % 10 != 10) * d % 10]
086                };
087     
088            return mask.replace(token, function ($0) {
089                return $0 in flags ? flags[$0] : $0.slice(1, $0.length - 1);
090            });
091        };
092    }();
093     
094    // Some common format strings
095    dateFormat.masks = {
096        "default":      "ddd mmm dd yyyy HH:MM:ss",
097        shortDate:      "m/d/yy",
098        mediumDate:     "mmm d, yyyy",
099        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
111    dateFormat.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", "November", "December"
119        ]
120    };
121     
122    // For convenience...
123    Date.prototype.format = function (mask, utc) {
124        return dateFormat(this, mask, utc);
125    };
[代码] 示例代码
01    var now = new Date();
02     
03    now.format("m/dd/yy");
04    // Returns, e.g., 6/09/07
05     
06    // Can also be used as a standalone function
07    dateFormat(now, "dddd, mmmm dS, yyyy, h:MM:ss TT");
08    // Saturday, June 9th, 2007, 5:46:21 PM
09     
10    // You can use one of several named masks
11    now.format("isoDateTime");
12    // 2007-06-09T17:46:21
13     
14    // ...Or add your own
15    dateFormat.masks.hammerTime = 'HH:MM! "Can\'t touch this!"';
16    now.format("hammerTime");
17    // 17:46! Can't touch this!
18     
19    // When using the standalone dateFormat function,
20    // you can also provide the date as a string
21    dateFormat("Jun 9 2007", "fullDate");
22    // Saturday, June 9, 2007
23     
24    // Note that if you don't include the mask argument,
25    // dateFormat.masks.default is used
26    now.format();
27    // Sat Jun 09 2007 17:46:21
28     
29    // And if you don't include the date argument,
30    // the current date and time is used
31    dateFormat();
32    // Sat Jun 09 2007 17:46:22
33     
34    // You can also skip the date argument (as long as your mask doesn't
35    // contain any numbers), in which case the current date/time is used
36    dateFormat("longTime");
37    // 5:46:22 PM EST
38     
39    // And finally, you can convert local time to UTC time. Either pass in
40    // true as an additional argument (no argument skipping allowed in this case):
41    dateFormat(now, "longTime", true);
42    now.format("longTime", true);
43    // Both lines return, e.g., 10:46:21 PM UTC
44     
45    // ...Or add the prefix "UTC:" to your mask.
46    now.format("UTC:h:MM:ss TT Z");
47    // 10:46:21 PM UTC