Date对象格式化方法

作者:张经炜 来源:张经炜blog 时间:2009-11-16 13:17:00 

/* * Date Format 1.2.3 * (c) 2007-2009 Steven Levithan * MIT license * * Includes enhancements by Scott Trenda * and Kris Kowal * * Accepts a date, a mask, or a date and a mask. * Returns a formatted version of the given date. * The date defaults to the current date/time. * The mask defaults to dateFormat.masks.default. */ var dateFormat = function () { var token = /d{1,4}|m{1,4}|yy(?:yy)?|([HhMsTt])\1?|[LloSZ]|"[^"]*"|'[^']*'/g,  timezone = /\b(?:[PMCEA][SDP]T|(?:Pacific|Mountain|Central|Eastern|Atlantic) (?:Standard|Daylight|Prevailing) Time|(?:GMT|UTC)(?:[-+]\d{4})?)\b/g,  timezoneClip = /[^-+\dA-Z]/g,  pad = function (val, len) {   val = String(val);   len = len || 2;   while (val.length < len) val = "0" + val;    return val;   };  // Regexes and supporting functions are cached through closure  return function (date, mask, utc) {   var dF = dateFormat;   // You can't provide utc if you skip other args (use the "UTC:" mask prefix)   if (arguments.length == 1 && Object.prototype.toString.call(date) == "[object String]" && !/\d/.test(date)) {    mask = date;    date = undefined;   }   // Passing date through Date applies Date.parse, if necessary   date = date ? new Date(date) : new Date;   if (isNaN(date)) throw SyntaxError("invalid date");   mask = String(dF.masks[mask] || mask || dF.masks["default"]);   // Allow setting the utc argument via the mask   if (mask.slice(0, 4) == "UTC:") {    mask = mask.slice(4);    utc = true;   }   var _ = utc ? "getUTC" : "get",    d = date[_ + "Date"](),    D = date[_ + "Day"](),    m = date[_ + "Month"](),    y = date[_ + "FullYear"](),    H = date[_ + "Hours"](),    M = date[_ + "Minutes"](),    s = date[_ + "Seconds"](),    L = date[_ + "Milliseconds"](),    o = utc ? 0 : date.getTimezoneOffset(),    flags = {     d:    d,     dd:   pad(d),     ddd:  dF.i18n.dayNames[D],     dddd: dF.i18n.dayNames[D + 7],     m:    m + 1,     mm:   pad(m + 1),     mmm:  dF.i18n.monthNames[m],     mmmm: dF.i18n.monthNames[m + 12],     yy:   String(y).slice(2),     yyyy: y,     h:    H % 12 || 12,     hh:   pad(H % 12 || 12),     H:    H,     HH:   pad(H),     M:    M,     MM:   pad(M),     s:    s,     ss:   pad(s),     l:    pad(L, 3),     L:    pad(L > 99 ? Math.round(L / 10) : L),    t:    H < 12 ? "a"  : "p",    tt:   H < 12 ? "am" : "pm",    T:    H < 12 ? "A"  : "P",    TT:   H < 12 ? "AM" : "PM",     Z:    utc ? "UTC" : (String(date).match(timezone) || [""]).pop().replace(timezoneClip, ""),     o:    (o > 0 ? "-" : "+") + pad(Math.floor(Math.abs(o) / 60) * 100 + Math.abs(o) % 60, 4),    S:    ["th", "st", "nd", "rd"][d % 10 > 3 ? 0 : (d % 100 - d % 10 != 10) * d % 10]   };   return mask.replace(token, function ($0) {   return $0 in flags ? flags[$0] : $0.slice(1, $0.length - 1);  }); };}(); // Some common format stringsdateFormat.masks = { "default":      "ddd mmm dd yyyy HH:MM:ss", shortDate:      "m/d/yy", mediumDate:     "mmm d, yyyy", longDate:       "mmmm d, yyyy", fullDate:       "dddd, mmmm d, yyyy", shortTime:      "h:MM TT", mediumTime:     "h:MM:ss TT", longTime:       "h:MM:ss TT Z", isoDate:        "yyyy-mm-dd", isoTime:        "HH:MM:ss", isoDateTime:    "yyyy-mm-dd'T'HH:MM:ss", isoUtcDateTime: "UTC:yyyy-mm-dd'T'HH:MM:ss'Z'"}; // Internationalization stringsdateFormat.i18n = { dayNames: [  "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat",  "Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday" ], monthNames: [  "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec",  "January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December" ]}; // For convenience...Date.prototype.format = function (mask, utc) { return dateFormat(this, mask, utc);};

用法:

var now = new Date();
 
now.format("m/dd/yy");
// Returns, e.g., 6/09/07
 
// Can also be used as a standalone function
dateFormat(now, "dddd, mmmm dS, yyyy, h:MM:ss TT");
// Saturday, June 9th, 2007, 5:46:21 PM
 
// You can use one of several named masks
now.format("isoDateTime");
// 2007-06-09T17:46:21
 
// ...Or add your own
dateFormat.masks.hammerTime = 'HH:MM! "Can\'t touch this!"';
now.format("hammerTime");
// 17:46! Can't touch this!
 
// When using the standalone dateFormat function,
// you can also provide the date as a string
dateFormat("Jun 9 2007", "fullDate");
// Saturday, June 9, 2007
 
// Note that if you don't include the mask argument,
// dateFormat.masks.default is used
now.format();
// Sat Jun 09 2007 17:46:21
 
// And if you don't include the date argument,
// the current date and time is used
dateFormat();
// Sat Jun 09 2007 17:46:22
 
// You can also skip the date argument (as long as your mask doesn't
// contain any numbers), in which case the current date/time is used
dateFormat("longTime");
// 5:46:22 PM EST
 
// And finally, you can convert local time to UTC time. Either pass in
// true as an additional argument (no argument skipping allowed in this case):
dateFormat(now, "longTime", true);
now.format("longTime", true);
// Both lines return, e.g., 10:46:21 PM UTC
 
// ...Or add the prefix "UTC:" to your mask.
now.format("UTC:h:MM:ss TT Z");
// 10:46:21 PM UTC

MaskDescription
dDay of the month as digits; no leading zero for single-digit days.
ddDay of the month as digits; leading zero for single-digit days.
dddDay of the week as a three-letter abbreviation.
ddddDay of the week as its full name.
mMonth as digits; no leading zero for single-digit months.
mmMonth as digits; leading zero for single-digit months.
mmmMonth as a three-letter abbreviation.
mmmmMonth as its full name.
yyYear as last two digits; leading zero for years less than 10.
yyyyYear represented by four digits.
hHours; no leading zero for single-digit hours (12-hour clock).
hhHours; leading zero for single-digit hours (12-hour clock).
HHours; no leading zero for single-digit hours (24-hour clock).
HHHours; leading zero for single-digit hours (24-hour clock).
MMinutes; no leading zero for single-digit minutes.
Uppercase M unlike CF timeFormat’s m to avoid conflict with months.
MMMinutes; leading zero for single-digit minutes.
Uppercase MM unlike CF timeFormat’s mm to avoid conflict with months.
sSeconds; no leading zero for single-digit seconds.
ssSeconds; leading zero for single-digit seconds.
l or LMilliseconds. l gives 3 digits. L gives 2 digits.
tLowercase, single-character time marker string: a or p.
No equivalent in CF.
ttLowercase, two-character time marker string: am or pm.
No equivalent in CF.
TUppercase, single-character time marker string: A or P.
Uppercase T unlike CF’s t to allow for user-specified casing.
TTUppercase, two-character time marker string: AM or PM.
Uppercase TT unlike CF’s tt to allow for user-specified casing.
ZUS timezone abbreviation, e.g. EST or MDT. With non-US timezones or in the Opera browser, the GMT/UTC offset is returned, e.g. GMT-0500
No equivalent in CF.
oGMT/UTC timezone offset, e.g. -0500 or +0230.
No equivalent in CF.
SThe date’s ordinal suffix (st, nd, rd, or th). Works well with d.
No equivalent in CF.
'…' or "…"Literal character sequence. Surrounding quotes are removed.
No equivalent in CF.
UTC:

Must be the first four characters of the mask. Converts the date from local time to UTC/GMT/Zulu time before applying the mask. The “UTC:” prefix is removed.
No equivalent in CF.

 

NameMaskExample
defaultddd mmm dd yyyy HH:MM:ssSat Jun 09 2007 17:46:21
shortDatem/d/yy6/9/07
mediumDatemmm d, yyyyJun 9, 2007
longDatemmmm d, yyyyJune 9, 2007
fullDatedddd, mmmm d, yyyySaturday, June 9, 2007
shortTimeh:MM TT5:46 PM
mediumTimeh:MM:ss TT5:46:21 PM
longTimeh:MM:ss TT Z5:46:21 PM EST
isoDateyyyy-mm-dd2007-06-09
isoTimeHH:MM:ss17:46:21
isoDateTimeyyyy-mm-dd’T'HH:MM:ss2007-06-09T17:46:21
isoUtcDateTimeUTC:yyyy-mm-dd’T'HH:MM:ss’Z’2007-06-09T22:46:21Z

标签:date,格式化,时间,日期
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