JS将时间戳转换成日期格式

/**
 * 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()] : 'th'},
        w: function(){return jsdate.getDay()},
        z: function(){return (jsdate - new Date(jsdate.getFullYear() + "/1/1")) / 864e5 >> 0},
    // Week
    W: function(){
        var a = f.z(), b = 364 + f.L() - a;
        var nd2, nd = (new Date(jsdate.getFullYear() + &quot;/1/1&quot;).getDay() || 7) - 1;
        if(b &lt;= 2 &amp;&amp; ((jsdate.getDay() || 7) - 1) &lt;= 2 - b){
            return 1;
        } else{
            if(a &lt;= 2 &amp;&amp; nd &gt;= 4 &amp;&amp; a &gt;= (6 - nd)){
                nd2 = new Date(jsdate.getFullYear() - 1 + &quot;/12/31&quot;);
                return date(&quot;W&quot;, Math.round(nd2.getTime()/1000));
            } else{
                return (1 + (nd &lt;= 3 ? ((a + nd) / 7) : (a - (7 - nd)) / 7) &gt;&gt; 0);
            }
        }
    },
   
    // 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 &amp; 1 &amp;&amp; n &lt; 8 || !(n &amp; 1) &amp;&amp; n &gt; 7 ){
                return 31;
            } else{
                return 30;
            }
        }
    },
   
    // Year
    L: function(){var y = f.Y();return (!(y &amp; 3) &amp;&amp; (y % 1e2 || !(y % 4e2))) ? 1 : 0},
    //o not supported yet
    Y: function(){return jsdate.getFullYear()},
    y: function(){return (jsdate.getFullYear() + &quot;&quot;).slice(2)},
   
    // Time
    a: function(){return jsdate.getHours() &gt; 11 ? &quot;pm&quot; : &quot;am&quot;},
    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 &gt; 1000) beat -= 1000;
        if (beat &lt; 0) beat += 1000;
        if ((String(beat)).length == 1) beat = &quot;00&quot;+beat;
        if ((String(beat)).length == 2) beat = &quot;0&quot;+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() &gt; 0) t = &quot;-&quot; + t; else t = &quot;+&quot; + t;
        return t;
    },
    P: function(){var O = f.O();return (O.substr(0, 3) + &quot;:&quot; + O.substr(3, 2))},
    //T not supported yet
    //Z not supported yet
   
    // Full Date/Time
    c: function(){return f.Y() + &quot;-&quot; + f.m() + &quot;-&quot; + f.d() + &quot;T&quot; + f.h() + &quot;:&quot; + f.i() + &quot;:&quot; + 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;
});

}

date('Y-m-d','1350052653');//很方便的将时间戳转换成了2012-10-11
date('Y-m-d H:i:s','1350052653');//得到的结果是2012-10-12 22:37:33