js时间格式转化封装（支持所有格式）

可随意组合自己需要的时间格式

//年：Y 月：m 日：d 时：h 分：i 秒：s  可随意组合（下面是调用函数例子，date是封装的函数）
    date('Y-m-d h:i:s',new Date().getTime())//2022-06-08 05:31:54
    date('Y/m/d h:i:s',new Date().getTime())//2022/06/08 05:32:36
    date('Y---m---d h-i-s',new Date().getTime())//2022---06---08 05-33-19

//万能时间格式转化封装
    function date(format, times){//两个参数format是格式，times是时间戳
        var a, jsdate=((times) ? new Date(times) : new Date());//获取时间戳
        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 = {//获取天
            // 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(){//获取周
                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)},
            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))},
            c: function(){return f.Y() + "-" + f.m() + "-" + f.d() + "T" + f.h() + ":" + f.i() + ":" + f.s() + f.P()},
            U: function(){return Math.round(jsdate.getTime()/1000)}
        };

        return format.replace(/[\\]?([a-zA-Z])/g, function(t, s){
            if( t!=s ){
                ret = s;
            } else if( f[s] ){
                ret = f[s]();
            } else{
                ret = s;
            }
            return ret;
        });
    }