和PHP的date函数用法一样的JS时间戳格式化函数

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/**

* 和PHP一样的时间戳格式化函数

* @param {string} format 格式

* @param {int} timestamp 要格式化的时间 默认为当前时间

* @return {string} 格式化的时间字符串

*/

function date(format, timestamp){

var a, jsdate=((timestamp) ? new Date(timestamp*1000) : new Date());

var pad = function(n, c){

if((n = n + "").length < c){

return new Array(++c - n.length).join("0") + n;

} else {

return n;

}

};

var txt_weekdays = ["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"];

var txt_ordin = {1:"st", 2:"nd", 3:"rd", 21:"st", 22:"nd", 23:"rd", 31:"st"};

var txt_months = ["", "January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"];

var f = {

// Day

d: function(){return pad(f.j(), 2)},

D: function(){return f.l().substr(0,3)},

j: function(){return jsdate.getDate()},

l: function(){return txt_weekdays[f.w()]},

N: function(){return f.w() + 1},

S: function(){return txt_ordin[f.j()] ? txt_ordin[f.j()] : h},

w: function(){return jsdate.getDay()},

z: function(){return (jsdate - new Date(jsdate.getFullYear() + "/1/1")) / 864e5 >> 0},

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// Week

W: function(){

var a = f.z(), b = 364 + f.L() - a;

var nd2, nd = (new Date(jsdate.getFullYear() + "/1/1").getDay() || 7) - 1;

if(b <= 2 && ((jsdate.getDay() || 7) - 1) <= 2 - b){

return 1;

} else{

if(a = 4 && a >= (6 - nd)){

nd2 = new Date(jsdate.getFullYear() - 1 + "/12/31");

return date("W", Math.round(nd2.getTime()/1000));

} else{

return (1 + (nd > 0);

}

}

},

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// Month

F: function(){return txt_months[f.n()]},

m: function(){return pad(f.n(), 2)},

M: function(){return f.F().substr(0,3)},

n: function(){return jsdate.getMonth() + 1},

t: function(){

var n;

if( (n = jsdate.getMonth() + 1) == 2 ){

return 28 + f.L();

} else{

if( n & 1 && n 7 ){

return 31;

} else{

return 30;

}

}

},

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// Year

L: function(){var y = f.Y();return (!(y & 3) && (y % 1e2 || !(y % 4e2))) ? 1 : 0},

//o not supported yet

Y: function(){return jsdate.getFullYear()},

y: function(){return (jsdate.getFullYear() + "").slice(2)},

// Time

a: function(){return jsdate.getHours() > 11 ? "pm" : "am"},

A: function(){return f.a().toUpperCase()},

B: function(){

// peter paul koch:

var off = (jsdate.getTimezoneOffset() + 60)*60;

var theSeconds = (jsdate.getHours() * 3600) + (jsdate.getMinutes() * 60) + jsdate.getSeconds() + off;

var beat = Math.floor(theSeconds/86.4);

if (beat > 1000) beat -= 1000;

if (beat < 0) beat += 1000;

if ((String(beat)).length == 1) beat = "00"+beat;

if ((String(beat)).length == 2) beat = "0"+beat;

return beat;

},

g: function(){return jsdate.getHours() % 12 || 12},

G: function(){return jsdate.getHours()},

h: function(){return pad(f.g(), 2)},

H: function(){return pad(jsdate.getHours(), 2)},

i: function(){return pad(jsdate.getMinutes(), 2)},

s: function(){return pad(jsdate.getSeconds(), 2)},

//u not supported yet

// Timezone

//e not supported yet

//I not supported yet

O: function(){

var t = pad(Math.abs(jsdate.getTimezoneOffset()/60*100), 4);

if (jsdate.getTimezoneOffset() > 0) t = "-" + t; else t = "+" + t;

return t;

},

P: function(){var O = f.O();return (O.substr(0, 3) + ":" + O.substr(3, 2))},

//T not supported yet

//Z not supported yet

// Full Date/Time

c: function(){return f.Y() + "-" + f.m() + "-" + f.d() + "T" + f.h() + ":" + f.i() + ":" + f.s() + f.P()},

//r not supported yet

U: function(){return Math.round(jsdate.getTime()/1000)}

};

return format.replace(/[\\]?([a-zA-Z])/g, function(t, s){

if( t!=s ){

// escaped

ret = s;

} else if( f[s] ){

// a date function exists

ret = f[s]();

} else{

// nothing special

ret = s;

}

return ret;

});

}

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