How do I Calculate Date Differences in JavaScript?

Date Difference Calculations in JavaScript

Determining the difference between two dates is a common task in JavaScript. By leveraging the Date object and its millisecond value, this difference can be calculated.

<code class="javascript">var a = new Date(); // Current date
var b = new Date(2010, 0, 1, 0, 0, 0, 0); // Start of 2010

var d = b - a; // Difference in milliseconds</code>

To obtain the number of seconds, divide the milliseconds by 1000 and then convert to an integer:

<code class="javascript">var seconds = parseInt((b - a) / 1000);</code>

For longer time units, continue dividing by appropriate factors and converting to integers:

<code class="javascript">var minutes = parseInt(seconds / 60);
var hours = parseInt(minutes / 60);</code>

Alternatively, create a function to calculate the maximum whole amount of a time unit and the remainder:

<code class="javascript">function get_whole_values(base_value, time_fractions) {
    time_data = [base_value];
    for (i = 0; i < time_fractions.length; i++) {
        time_data.push(parseInt(time_data[i] / time_fractions[i]));
        time_data[i] = time_data[i] % time_fractions[i];
    }
    return time_data;
}

Example:

<code class="javascript">console.log(get_whole_values(72000, [1000, 60])); // Output: [0, 12, 1] (0 milliseconds, 12 seconds, 1 minute)

Note that when providing input parameters for the Date object, only necessary values need to be specified:

<code class="javascript">new Date(<year>, <month>, <day>, <hours>, <minutes>, <seconds>, <milliseconds>);</code>

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