How Can I Calculate the Time Difference Between Two Times Using JavaScript?

How to Calculate Time Differences with Javascript

Determining the time difference between two specified times can be a useful task in various scenarios. Javascript offers a straightforward method to calculate this difference using Date objects.

Solution:

To ascertain the time difference, subtract the two Date objects representing the respective times. This approach entails:

1. Create Date Objects:

   Instantiate Date objects from the input time strings. Utilizing an arbitrary date part but specifying the desired time and UTC timezone ensures consistent results.

2. Handle Midnight Cases:

   If the times fall on opposite sides of midnight, adjust the later time's date by one day to facilitate accurate subtraction.

3. Calculate Difference:

   Calculate the difference between the two Date objects using the subtraction operator (-).

Example:

Consider the following sample code:

let time1 = "09:00";
let time2 = "17:00";

let date1 = new Date(`2000-01-01T${time1}Z`);
let date2 = new Date(`2000-01-01T${time2}Z`);

if (date2 < date1) {
  date2.setDate(date2.getDate() + 1);
}

let diff = date2 - date1;
console.log(diff); // Output: 28800000 (8 hours)

This example demonstrates a practical implementation of the time difference calculation, yielding the expected result of 8 hours.

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