js时间日期格式相互转换

function add0(m){return m<10?'0'+m:m }function format(shijianchuo){//shijianchuo是整数，否则要parseInt转换var time = new Date(shijianchuo);var y = lYear();var m = th()+1;var d = e();var h = rs();var mm = utes();var s = onds();return y+'-'+add0(m)+'-'+add0(d)+' '+add0(h)+':'+add0(mm)+':'+add0(s);}三.封装的时间格式器/**

* 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 - ).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 e()},

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

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

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

w: function(){return ()},

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

// Week

W: function(){

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

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

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

return 1;

} else{

if(a <= 2 && nd >= 4 && a >= (6 - nd)){

nd2 = new Date(lYear() - 1 + "/12/31");

return date("W", (e()/1000));

} else{

return (1 + (nd <= 3 ? ((a + nd) / 7) : (a - (7 - nd)) / 7) >> 0);

}

}

},

// Month

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

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 th() + 1},

t: function(){

var n;

if( (n = th() + 1) == 2 ){

return 28 + f.L();

} else{

if( n & 1 && n < 8 || !(n & 1) && n > 7 ){

return 31;

} else{

return 30;

}

}

},

// Year

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

//o not supported yet

Y: function(){return lYear()},

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

// Time

a: function(){return rs() > 11 ? "pm" : "am"},

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

B: function(){

// peter paul koch:

var off = (ezoneOffset() + 60)*60;

var theSeconds = (rs() * 3600) + (utes() * 60) + onds() + off;

var beat = (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 rs() % 12 || 12},

G: function(){return rs()},

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

H: function(){return pad(rs(), 2)},

i: function(){return pad(utes(), 2)},

s: function(){return pad(onds(), 2)},

//u not supported yet

// Timezone

//e not supported yet

//I not supported yet

O: function(){

var t = pad((ezoneOffset()/60*100), 4);

if (ezoneOffset() > 0) t = "-" + t; else t = "+" + t;

return t;

},

P: function(){var O = f.O();return ((0, 3) + ":" + (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 (e()/1000)}

};

return e(/[]?([a-zA-Z])/g, function(t, s){

if( t!=s ){

// escaped