How to convert timestamp to number of days in javascript

Conversion method: First obtain the timestamp of the current time and the timestamp of the specified date; then subtract the two obtained timestamps to obtain the time difference; finally calculate the "time difference / (1000*3600 *24)" expression value is enough.

The operating environment of this tutorial: windows7 system, javascript version 1.8.5, Dell G3 computer.

JS converts the year, month, day, hour, minute and second string into a timestamp

  var time = Date.parse(new Date("2020-08-31 16:00"));

will output a timestamp representing 2020-08-31 16:00:

1598860800000

Convert timestamp to number of days

Subtract the current time from the deadline to calculate the number of days until the deadline

var d = new Date();
var rangeDateNum = (d.getTime()-time) / (1000*3600*24);

Example: Convert 1598860800000 into days

var time = Date.parse(new Date("2020-08-31 16:00"));
var d = new Date();
var rangeDateNum = (d.getTime()-time) / (1000*3600*24);
console.log(rangeDateNum);

Output results:

371.9680493634259

Extended knowledge: converting timestamp to date

//parseInt()字符串转数字
//new Date()放入时间戳，没有放默认当前时间
this.tableData[i].createTime = this.formatDate(new Date(parseInt(this.tableData[i].createTime)))

// 时间戳转换日期格式
    formatDate(now) {
      var year = now.getFullYear();  //取得4位数的年份
      var month = now.getMonth() + 1;  //取得日期中的月份，其中0表示1月，11表示12月
      var date = now.getDate();      //返回日期月份中的天数（1到31）
      var hour = now.getHours();     //返回日期中的小时数（0到23）
      var minute = now.getMinutes(); //返回日期中的分钟数（0到59）
      var second = now.getSeconds(); //返回日期中的秒数（0到59）
      return year + "-" + month + "-" + date + " " + hour + ":" + minute + ":" + second;
    }

[Recommended learning: javascript advanced tutorial 】

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