compute dates js code example

Example 1: javascript difference between two dates in days

/* difference between date1 and date2 in days (date2 - date1) */
/* date1 and date 2 are already javascript date objects */
function dateDifference(date2, date1) {
    const _MS_PER_DAY = 1000 * 60 * 60 * 24;

    // Discard the time and time-zone information.
    const utc1 = Date.UTC(date1.getFullYear(), date1.getMonth(), date1.getDate());
    const utc2 = Date.UTC(date2.getFullYear(), date2.getMonth(), date2.getDate());

    return Math.floor((utc2 - utc1) / _MS_PER_DAY);
}

Example 2: how to substract date object javascript

Example
<html>
   <head>
      <title>JavaScript setDate Method</title>
   </head>
   <body>
      <script>
         var dt = new Date("December 30, 2017 11:20:25");
         dt.setDate( dt.getDate() - 10 );
         document.write( dt );
      </script>
   </body>
</html>
Output
Wed Dec 20 2017 11:20:25 GMT+0530 (India Standard Time)

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