JS 不同时间格式转换(ISO时间&时间戳转北京时间)

  //格林尼治2019-03-19T16:00:00.000Z  ==>>  2019-03-20 00:00:00   与北京时间8小时时差

    
         //格林尼治2019-03-19T16:00:00.000Z  ==>>  2019-03-20 00:00:00 
    
 	       // //时间戳1553547600000  转 //  2019-03-25T21:00:00.000Z
    
         function formDate(dateForm) {
    
             if (dateForm === "") {  //解决deteForm为空传1970-01-01 00:00:00
    
                 return "";
    
             }else{
    
                 var dateee = new Date(dateForm ).toJSON();
    
                 var date = new Date(+new Date(dateee)+ 8 * 3600 * 1000).toISOString().replace(/T/g,' ').replace(/\.[\d]{3}Z/,'');
    
                 return date;
    
             }
    
         }
    
         console.log(formDate("2019-03-19T16:00:00.000Z"))//2019-03-20 00:00:00
    
         console.log(formDate(1553547600000))             //2019-03-26 05:00:00
    
         console.log(formatDateT(1553547600000))          //2019-03-25T21:00:00.000Z
    
  
    
          //时间戳1553547600000  转 //  2019-03-25T21:00:00.000Z
    
         function formatDateT(dataTime){
    
             // var timestamp3 = 1551686227000; 
    
             var timestamp = dataTime;
    
             var newDate = new Date(dataTime ); 
    
             // var newDate = new Date(dataTime + 8 * 3600 * 1000 );               
    
  
    
             newDate.getTime(timestamp * 1000);                
    
             // console.log(newDate.toDateString());//Mon Mar 11 2019                
    
             // console.log(newDate.toGMTString()); //Mon, 11 Mar 2019 06:55:07 GMT                
    
             // console.log(newDate.toISOString()); //2019-03-11T06:55:07.622Z
    
             return newDate.toISOString()
    
         }