javascript Date對象

1、js創建時間對象

new Date(“month dd,yyyy hh:mm:ss”);
new Date(“month dd,yyyy”);
new Date(yyyy,mth,dd,hh,mm,ss);
new Date(yyyy,mth,dd);
new Date(ms);

var date1 = new Date('10 10,2010 10:10:10');
var date2 = new Date('10 10,2010');
var date3 = new Date(2010,10,10,10,10,10);
var date4 = new Date(2010,10,10);
var date5 = new Date(1539670798651);

 

2、Date對象的相關方法

var date = new Date();
date.getFullYear(); //返回當前時間的年份
date.getMonth(); //返回當前時間的月份（0-11）
date.getDate();  //返回當前月的當前天
date.getHours(); //返回當前的小時數
date.getMinutes(); //返回當前分鐘數
date.getSeconds(); //返回當前月的秒數
date.getTime(); //返回時間戳 （1970 年 1 月 1 日至今的毫秒數）
date.getDay(); //返回當前周的當前天

/* 上面的函數比較常用，還有相對有set方法 */

date.toString();
date.toLocaleString();
date.toLocaleDateString();
date.toLocaleTimeString();
date.toTimeString();
date.toDateString();

3、時間對象轉換爲我們的平常時間 

 Date.prototype.Format = function (fmt) { //author: meizz 
    var o = {
        "M+": this.getMonth() + 1, //月份 
        "d+": this.getDate(), //日 
        "H+": this.getHours(), //小時 
        "m+": this.getMinutes(), //分 
        "s+": this.getSeconds(), //秒 
        "q+": Math.floor((this.getMonth() + 3) / 3), //季度 
        "S": this.getMilliseconds() //毫秒 
      };

      if (/(Y+)/.test(fmt)) fmt = fmt.replace(RegExp.$1, (this.getFullYear() + "").substr(4 - RegExp.$1.length));
      for (var k in o)
        if (new RegExp("(" + k + ")").test(fmt)) fmt = fmt.replace(RegExp.$1, (RegExp.$1.length == 1) ? (o[k]) : (("00" + o[k]).substr(("" + o[k]).length)));
      return fmt;
  }

 var now = new Date();

 console.log(now.Format('YYYY-MM-dd HH:mm:ss')); //2018-10-16 15:14:27

4、倒計時函數

Date.prototype.countDown = function(){
    if(arguments.length == 1 && !isNaN(arguments[0])){
      var arg1 = arguments[0], result = {} ,status = 1;
      var oldarg1length = arg1.toString().length;
      if(oldarg1length < 13){
        for(var i = 0; i < 13 - oldarg1length; i++){
          arg1 += '0';
        }
      }

      if(oldarg1length > 13)
        arg1 = arg1.toString().substring(0,13);

      var now = new Date();
      var point_now = new Date(Number(arg1));
      if(point_now.getTime() > now.getTime()){
        var totalSecs  = result.totalSecs = (point_now - now)/1000; 
        var days       = result.days      = Math.floor(totalSecs/3600/24); 
        var hours      = result.hours     = Math.floor((totalSecs-days*24*3600)/3600); 
        var mins       = result.mins      = Math.floor((totalSecs-days*24*3600-hours*3600)/60); 
        var secs       = result.secs      = Math.floor((totalSecs-days*24*3600-hours*3600-mins*60)); 

        result.status = status;
      }else result.status = 0;
      return result;
    }
  }