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

Determining Time Difference in JavaScript

Understanding the time difference between two points is crucial in numerous applications. In JavaScript, calculating the time difference between two given text-box inputs can be achieved through a straightforward approach.

To determine the time difference, we can utilize the Date object's arithmetic capabilities. By subtracting two Date objects representing the input times, we obtain the difference expressed in milliseconds.

Let's delve into an example to illustrate this process. Suppose we have two text boxes containing the times "09:00" and "17:00." To calculate the time difference, we create two Date objects, date1 and date2, representing these times respectively:

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`);

It's noteworthy that we specify an arbitrary date part (here, "2000-01-01") as our focus is solely on the time component. The "Z" suffix denotes UTC timezone.

Now, to handle situations where the input times span across midnight (e.g., calculating the difference between 9:00 PM and 5:00 AM), we adjust date2 by incrementing its date by one:

if (date2 <p>Finally, we calculate the time difference by subtracting date1 from date2 and storing the result in diff:</p><pre class="brush:php;toolbar:false">let diff = date2 - date1;

The value of diff now represents the time difference in milliseconds. In our example, it would be 28800000 milliseconds, which corresponds to 8 hours.

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