js日期函数

获取计算特殊的日期格式对象：

获取当前日期：  兼容性

new Date();//Mon Nov 05 2018 01:11:35 GMT+0800 (中国标准时间) 

var newDay=new Date(1541351729432);//Mon Nov 05 2018 01:15:29 GMT+0800 (中国标准时间)                       时间戳换特殊格式
var newDay=new Date('1990','06','06','12','15','15');//Fri Jul 06 1990 12:15:15 GMT+0900 (中国夏令时间)     
var newDay=new Date('2018-11-05 12:25:45');//Mon Nov 05 2018 12:25:45 GMT+0800 (中国标准时间)//这个有许多浏览器不兼容
// 主要对默认的日期格式进行转换， 基于'/'格式的日期字符串，才是被各个浏览器所广泛支持的，‘-’连接的日期字符串，则是只在chrome下可以正常工作
var timeStr= "2017-11-09 23:23:23"
var time= new Date(timeStr.replace(/-/g,"/"));  

特殊日期对象转时间戳：

var newDay=new Date();//Mon Nov 05 2018 01:15:29 GMT+0800 (中国标准时间)
var b= Number(newDay)//1541351729432  到毫秒
var b=newDay.valueOf();//1541351729432  到毫秒
var b=newDay.getTime();//1541351729432  到毫秒
var b=newDay.getTime();//1541351729432  到毫秒
var b=Date.parse(newDay)//1541351729000 到秒          除以1000就得到1541351729 标准的以秒为单位时间戳

 格式化日期转时间戳：

Date.parse('2018-11-29 01:47:24');//1543427244    (除了谷歌浏览器都得不到结果）

// 主要对默认的日期格式进行转换， 基于'/'格式的日期字符串，才是被各个浏览器所广泛支持的，‘-’连接的日期字符串，则是只在chrome下可以正常工作
var timeStr= "2017-11-09 23:23:23"
var time= new Date(Date.parse(timeStr.replace(/-/g,"/"))).getTime();  

①时间戳转格式化日期：

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

 ②数组转格式化时间

            ;function timeArrayToFormatTime(data,seconds){
                seconds=seconds|0;

                var stime= new Date(data.year,data.month-1,data.date,data.hours,data.minutes,data.seconds);
                stime=Date.parse(stime)/1000;
                stime=formatDate('Y-m-d H:i:s',stime+seconds)
                return stime;
            }

时间对象转时间数组

            ;function nowTimeObjToArray(timeObj){
                timeObj=timeObj||new Date();
                var startYear=timeObj.getFullYear();
                var startMonth=timeObj.getMonth()+1;
                var startDay=timeObj.getDate();
                var startHours=timeObj.getHours();
                var startMinutes=timeObj.getMinutes();
                var startSeconds=timeObj.getSeconds();
                var timeArr= {
                   year: startYear,
                   month: startMonth,
                   date: startDay,
                   hours: startHours,
                   minutes: startMinutes,
                   seconds:startSeconds
                };
               return timeArr;
            }

时间对象转格式化时间 （2018-11-08 17:03:13 ）  时间戳转格式化日期

             //时间对象转格式化时间，或者时间戳转格式化时间(10位的标准时间戳和13位毫秒时间戳)
            ;function nowTimeObjToFormatTime(timeObj){
                timeObj=timeObj||'';
                var preg=/(^[0-9][0-9]{9}$)|(^[0-9][0-9]{12}$)/;
                if(typeof timeObj=='object'&&timeObj instanceof Date){
                   timeObj=timeObj;
                }else if(preg.test(timeObj.toString().replace(/(^s*)|(s*$)/g,""))){
                    alert(111)
                    var newStr=timeObj.toString().replace(/(^s*)|(s*$)/g,"");
                    if(newStr.length==10){
                        newStr=newStr+'000';
                    }
                    timeObj=Number(newStr);
                    timeObj=new Date(timeObj);
                }else{
                   timeObj=new Date();
                }

                var startYear=timeObj.getFullYear();
                var startMonth=timeObj.getMonth()+1;
                var startDay=timeObj.getDate();
                var startHours=timeObj.getHours();
                var startMinutes=timeObj.getMinutes();
                var startSeconds=timeObj.getSeconds();


                if(startMonth<10){
                    startMonth='0'+startMonth;//0-11
                }
                if(startDay<10){
                    startDay='0'+startDay;//1-31
                }
                if(startHours==0||startHours<10){
                    startHours='0'+startHours;//0-23
                }
                if(startMinutes==0||startMinutes<10){
                    startMinutes='0'+startMinutes;//0-59
                }
                if(startSeconds==0||startSeconds<10){
                    startSeconds='0'+startSeconds;//0-59
                }

                var formatTime=startYear+'-'+startMonth+'-'+startDay+' '+startHours+':'+startMinutes+':'+startSeconds;
                return formatTime;
            }

 数组转格式化时间