How do I get the remaining milliseconds by subtracting 2 dates to be used in a timeOut function?

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I have this code note that event date is 2018-09-27 and event timeEnd is 18:37

let now = new Date();
let eventEnd = new Date(
  `${this.attendanceParameters.attendance_event_date}, 
   ${this.attendanceParameters.attendance_time_end}`);

let difference = now.getMilliseconds() - eventEnd.getMilliseconds();

but it returns a relatively small number in a hundredth place when it should atleast return something on the thousandth place

update: here's the full code. Thanks for answering!

  hostAttendance() {
    let now = new Date();
    let eventStart = new Date(
      `${this.attendanceParameters.attendance_event_date}, 
       ${this.attendanceParameters.attendance_time_start}`);
    let eventEnd = new Date(
      `${this.attendanceParameters.attendance_event_date}, 
       ${this.attendanceParameters.attendance_time_end}`);
    if (now >= eventStart && now <= eventEnd) {
      this.hostSignInAttendance();
      let difference = (+eventEnd) - (+now);
      console.log(difference);
      setTimeout(() => {
        this.hostSignOutAttendance();
      }, difference)  
    }
    else if (now > eventEnd) {

    }
    else if (now < eventStart) {
      this.alert('Event has not yet started', 'Please wait until event has concluded, thank you!', 'Ok');
    }
  }

getMilliseconds returns a number between 0 and 999. As in, 5 hours 6 minutes 7 seconds 8 milliseconds will just return 8 (not 8 + 7 * 1000 + 6 * 1000 * 60 + 5 * 1000 * 60 * 60).

To get the total number of milliseconds, just cast to a number by adding + in front of a date:

const date1 = new Date(...)
const date2 = new Date(...)
const diff = (+date2) - (+date1)

In the above code, diff will the number of milliseconds between two timestamps.


Technically, you can also just do date2 - date1 but that might be a bit misleading since it's an implicit type coercion which you might want to avoid in order not to confuse yourself and others hen reading our code.

Cooperative asynchronous JavaScript: Timeouts and intervals , I get the remaining milliseconds by subtracting 2 dates to be used in a timeOut you're probably looking for the getTime() function – Olivier Krull Sep 27 '18 at  Justine Lance T. Mojal. 1 How do I get the remaining milliseconds by subtracting 2 dates to be used in a timeOut function? Sep 27 '18.

You could try this:

let difference = now.getTime() - eventEnd.getTime();

The getTime method will return a number representing the milliseconds elapsed between 1 January 1970 00:00:00

Reference

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Simply subtracting one date object with another date object returns the difference in milliseconds. Then you can convert those milliseconds to other desired interval.

let now = new Date();
let eventEnd = new Date(
  `2018-09-27, 
   18:37`);
let difference = (+eventEnd)-(+now);
console.log(difference);

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Comments
  • you're probably looking for the getTime() function
  • What would the '+' for be? For anti negative difference?
  • It's just for casting to number. Try it out in the console: +new Date() gives you the number of milliseconds since January 1st, 1970 until the current time.
  • @LazarLjubenović Nice didn't know either about the + approach! (+1)
  • Thank you very much sirs!
  • @OlivierKrull +date1 is a shortcut for date1.getTime()
  • Thanks sir Royson!
  • Thanks sir Sumesh!
  • Can you explain how you arrived at this? Code-only answers are not very useful to future visitors.