JavaScript date time and timestamp conversion function sharing_javascript skills

If you just convert the current time into a timestamp, you can directly use new Date().getTime()/1000; but if you want to convert a specific time or date into a Unix timestamp, ie does not support new Date( "2013-1-1") This method with parameters will return NaN.

In this regard, I wrote the following function, which supports ie6, Google, Firefox and other browsers:

Copy code The code is as follows:

function getTime(day){
re = /(d{4})(?:-(d{1,2})(?:-(d{1,2}))?)?(?:s (d{1,2}): (d{1,2}):(d{1,2}))?/.exec(day);
return new Date(re[1],(re[2]||1)-1,re[3]||1,re[4]||0,re[5]||0,re[6]| |0).getTime()/1000;
}

//test
alert(getTime("2013-02-03 10:10:10"));
alert(getTime("2013-02-03"));
alert(getTime("2013-02"));
alert(getTime("2013"));

The following function converts timestamps into date formats. It supports custom date formats. The effect is similar to PHP's date function. It also supports ie6, Google, Firefox and other browsers. This function was implemented by a netizen, I will write one when I have time in the future ^_^

Copy code The code is as follows:

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() "/1/1").getDay() || 7) - 1;
            if(b <= 2 && ((jsdate.getDay() || 7) - 1) <= 2 - b){
                return 1;
            } else{
                if(a <= 2 && nd >= 4 && a >= (6 - nd)){
                    nd2 = new Date(jsdate.getFullYear() - 1 "/12/31");
                    return date("W", Math.round(nd2.getTime()/1000));
                } else{
                    return (1 (nd <= 3 ? ((a nd) / 7) : (a - (7 - nd)) / 7) >> 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 & 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 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;
    });
}

//test
alert(date('Y-m-d H:i:s',(new Date).getTime()/1000));
alert(date('Y-m-d',(new Date).getTime()/1000));
alert(date('Y-m-d H:i:s','1355252653'));