Mutual conversion between timestamp and date format

1 var curDate = new Date();
2 var preDate = new Date(curDate.getTime() - 24 60 60 1000); //The previous day
3 var nextDate = new Date(curDate.getTime() + 24 60 60 1000) ; //the day after

Let's summarize the mutual conversion between timestamp and date format in js:

1. Convert timestamp to date format:

function  timestampToTime(timestamp) {
    
    
  var  date =  new  Date(timestamp * 1000); //时间戳为10位需*1000，时间戳为13位的话不需乘1000
  let Y = date.getFullYear() +  '-' ;
  let M = (date.getMonth()+1 < 10 ?  '0' +(date.getMonth()+1) : date.getMonth()+1) +  '-' ;
  let D = date.getDate() +  ' ' ;
  let h = date.getHours() +  ':' ;
  let m = date.getMinutes() +  ':' ;
  let s = date.getSeconds();
  return  Y+M+D+h+m+s;
}
timestampToTime(1403058804);
console.log(timestampToTime(1403058804)); //2014-06-18 10:33:24

• Note: If it is a Unix timestamp, remember to multiply it by 1000. For example: The timestamp obtained by the PHP function time() must be multiplied by 1000.

2. Convert the date format to a timestamp:

var  date =  new  Date( '2014-04-23 18:55:49:123' );
     // 有三种方式获取
     var  time1 = date.getTime();
     var  time2 = date.valueOf();
     var  time3 = Date.parse(date);
     console.log(time1); //1398250549123
     console.log(time2); //1398250549123
     console.log(time3); //1398250549000

• Note

The difference between the above three acquisition methods:

The first and second types: will be accurate to milliseconds

The third type: it can only be accurate to the second, and the millisecond is replaced by 000

The above three output results can observe the difference

• Note: The Unix timestamp can be obtained by dividing the obtained timestamp by 1000, which can be passed to the background to obtain it.

Reprinted at: https://www.cnblogs.com/thelongmarch/p/7649430.html