JavaScript日期時間與時間戳的轉換

如果只是將當前時間轉成時間戳，可以直接使用new Date().getTime()/1000；但如果是將某個具體時間或日期轉成Unix時間戳，ie不支持像new Date(“2013-1-1”)  這樣帶參數的方法，將返回NaN

對此，我寫了以下函數，支持ie6+，谷歌，火狐等瀏覽器：

    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"));  

下面這個將時間戳轉換成日期格式的函數，支持自定義的日期格式，效果類似PHP的date函數，同樣支持ie6+，谷歌，火狐等瀏覽器。這個函數是網友實現的，以后有時間我也寫一個出來 ^_^

    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'));  

來自：http://blog.csdn.net/mycwq/article/details/12653117