JavaScript Function for Finding the Time Difference Between Two Dates (in Years, Days, Hours, or Less than One Hour)

I need to calculate the time difference between 2 dates and display it. If the difference is greater than a year, show the number of years only. If it's more than a day, show the number of days. If it's less than a day, show the number of hours. If it's less than an hour, display "You have less than one hour left."

One possible solution is to utilize Moment.js:

remainingTime() {
  moment.locale('fr_FR');
  return moment(new Date(this.finishedAt)).from(new Date(this.startedAt));
}

However, this method might not give the exact result if the remaining time is less than a day.

How can we achieve accurate results using native JavaScript or Moment.js for calculating the time difference?

Answer №1

Using vanilla JavaScript, achieving this task is quite straightforward. Keep in mind that dates are measured in milliseconds, allowing you to easily perform mathematical operations on them.

const findDateDifference = (startDate, endDate) => endDate - startDate;

You can create a function to calculate the difference in seconds (60), minutes (3600), hours (86400), months, and years—taking into account conditions for leap years and varying month lengths—and then return the appropriate result based on your specific requirements.

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