javascript格式化时间输出

使用方法如： new Date().formatLocale("yyyy-mm-dd HH:MM:ss", false, "CN"); 即可以输出 2011-05-20 16:42:00

具体使用方法详见：http://blog.stevenlevithan.com/archives/date-time-format。推荐大家在项目中使用。

附代码如下：

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, locale) {
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;
}

locale = locale ? ((dateFormat.i18n[locale])? locale : "CN") : "CN";

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[locale].dayNames[D],
dddd: dF.i18n[locale].dayNames[D + 7],
m:    m + 1,
mm:   pad(m + 1),
mmm:  dF.i18n[locale].monthNames[m],
mmmm: dF.i18n[locale].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 strings
dateFormat.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'"
};
//不同国家地区对应UTC时差
dateFormat.locale = {
"CN":{"name":"中国","language":"zh","offset":0},
"HK":{"name":"中国（香港）","language":"zh","offset":0},
"TW":{"name":"中国（台湾）","language":"zh","offset":0},
"GB":{"name":"英国","language":"en","offset":0},
"US":{"name":"美国","language":"en","offset":0}
}

// Internationalization strings
dateFormat.i18n = {
"GB":{
"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"
]
},
"US":{
"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"
]
},
"CN":{
"dayNames": [
"日", "一", "二", "三", "四", "五", "六",
"星期日", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六"
],
"monthNames": [
"一", "二", "三", "四", "五", "六", "七", "八", "九", "十", "十一", "十二",
"一月", "二月", "三月", "四月", "五月", "六月", "七月", "八月", "九月", "十月", "十一月", "十二月"
]
},
"HK":{
"dayNames": [
"日", "一", "二", "三", "四", "五", "六",
"星期日", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六"
],
"monthNames": [
"一", "二", "三", "四", "五", "六", "七", "八", "九", "十", "十一", "十二",
"一月", "二月", "三月", "四月", "五月", "六月", "七月", "八月", "九月", "十月", "十一月", "十二月"
]
},
"TW":{
"dayNames": [
"日", "一", "二", "三", "四", "五", "六",
"星期日", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六"
],
"monthNames": [
"一", "二", "三", "四", "五", "六", "七", "八", "九", "十", "十一", "十二",
"一月", "二月", "三月", "四月", "五月", "六月", "七月", "八月", "九月", "十月", "十一月", "十二月"
]
}
};

// For convenience...
Date.prototype.formatLocale = function (mask, utc, locale) {
return dateFormat(this, mask, utc, locale);
};

Date.prototype.format = function(fmt, locale, utc) {
var o = {
"M+": this.getMonth() + 1,
// 月份
"d+": this.getDate(),
// 日
"h+": this.getHours() % 12 == 0 ? 12 : this.getHours() % 12,
// 小时
"H+": this.getHours(),
// 小时
"m+": this.getMinutes(),
// 分
"s+": this.getSeconds(),
// 秒
"q+": Math.floor((this.getMonth() + 3) / 3),
// 季度
"S": this.getMilliseconds()
// 毫秒
};
var week = {
"0": "/日",
"1": "/一",
"2": "/二",
"3": "/三",
"4": "/四",
"5": "/五",
"6": "/六"
};
if (/(y+)/.test(fmt)) {
fmt = fmt.replace(RegExp.$1, (this.getFullYear() + "").substr(4 - RegExp.$1.length));
}
if (/(E+)/.test(fmt)) {
fmt = fmt.replace(RegExp.$1, ((RegExp.$1.length > 1) ? (RegExp.$1.length > 2 ? "/星/期": "/周") : "") + week[this.getDay() + ""]);
}
for (var k in o) {
if (new RegExp("(" + k + ")").test(fmt)) {
fmt = fmt.replace(RegExp.$1, (RegExp.$1.length == 1) ? (o[k]) : (("00" + o[k]).substr(("" + o[k]).length)));
}
}
return fmt;
}

/**
* 下一年
*/
Date.prototype.nextyear = function()
{
return new Date(this.getFullYear()+1, this.getMonth(),
this.getDate(), this.getHours(), this.getMinutes(),
this.getSeconds(), this.getMilliseconds());
}