时间日期格式处理

1.日期格式转为日期标准字符串：2019-10-08

let formatDate = function (date) {  
    var y = date.getFullYear();  
    var m = date.getMonth() + 1;  
    m = m < 10 ? '0' + m : m;  
    var d = date.getDate();  
    d = d < 10 ? ('0' + d) : d;  
    return y + '-' + m + '-' + d;  
};

2.js方法返回值：2019-10-08 12:00：00

let formatDateTime = function (date) {  
                var y = date.getFullYear();  
                var m = date.getMonth() + 1;  
                m = m < 10 ? ('0' + m) : m;  
                var d = date.getDate();  
                d = d < 10 ? ('0' + d) : d;  
                var h = date.getHours();  
                h=h < 10 ? ('0' + h) : h;  
                var minute = date.getMinutes();  
                minute = minute < 10 ? ('0' + minute) : minute;  
                var second=date.getSeconds();  
                second=second < 10 ? ('0' + second) : second;  
                return y + '-' + m + '-' + d+' '+h+':'+minute+':'+second;  
            };

调用：formatDate(Date()) formatDate(Date())

3.时间戳转为日期格式

//时间戳转日期格式  
      let formatDateTime3 = function(time, format){  
          let t = new Date(time);  
         let tf = function(i){return (i < 10 ? '0' : '') + i};  
          return format.replace(/yyyy|MM|dd|HH|mm|ss/g, function(a){  
              switch(a){  
                  case 'yyyy':  
                      return tf(t.getFullYear());  
                      break;  
                  case 'MM':  
                      return tf(t.getMonth() + 1);  
                      break;  
                  case 'mm':  
                      return tf(t.getMinutes());  
                      break;  
                  case 'dd':  
                      return tf(t.getDate());  
                      break;  
                  case 'HH':  
                      return tf(t.getHours());  
                      break;  
                  case 'ss':  
                      return tf(t.getSeconds());  
                      break;  
              }  
          })  
      };

4.时间格式字符串转为时间戳（毫秒）

let time1=‘2019-10-08 18:22:37’；  
let date=new Date(time1.replace(/-/g, '/'));  //开始时间  
let time2=date.getTime();