How Do I Calculate the Difference Between Two Dates in JavaScript, Down to Milliseconds?

Calculating Date Differences in JavaScript

Subtracting two Date objects in JavaScript yields their difference in milliseconds. To determine the difference in specific time intervals (e.g., days, hours), perform simple arithmetic.

const date2 = new Date(2023, 5, 2, 13, 30, 0);
const date1 = new Date(2023, 5, 1, 10, 25, 0);

const difference = date2 - date1; // Difference in milliseconds

Calculating Days

const days = Math.floor(difference / (1000 * 60 * 60 * 24));

Calculating Hours

const hours = Math.floor((difference % (1000 * 60 * 60 * 24)) / (1000 * 60 * 60));

Calculating Minutes

const minutes = Math.floor((difference % (1000 * 60 * 60)) / (1000 * 60));

Calculating Seconds

const seconds = Math.floor((difference % (1000 * 60)) / 1000);

Calculating Milliseconds

const milliseconds = difference % 1000;

Calculating Nanoseconds

JavaScript Date objects do not inherently track nanoseconds. To calculate nanoseconds, you can use a third-party library or convert the milliseconds difference to nanoseconds manually.

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