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JavaScript - calculate time left to given date
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In this article, we would like to show you how to calculate time left to given date in JavaScript.
Quick solution:
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const now = new Date().getTime();2
const futureDate = new Date('27 Jan 2030 16:40:00').getTime();3
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const timeleft = futureDate - now;5
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const days = Math.floor( timeleft / (1000 * 60 * 60 * 24));7
const hours = Math.floor((timeleft % (1000 * 60 * 60 * 24)) / (1000 * 60 * 60));8
const minutes = Math.floor((timeleft % (1000 * 60 * 60)) / (1000 * 60));9
const seconds = Math.floor((timeleft % (1000 * 60)) / 1000);10
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console.log(days + ' days ' + hours + ' hours ' + minutes + ' minutes ' + seconds + ' seconds left');
In this example, we calculate the difference between current date (now) and given date in three steps:
- Get time that passed since Unix Epoch using
Date()constructor withgetTime(), - calculate the difference between current date and future date,
- convert milliseconds to seconds, minutes, hours, etc.
- calculate remaining time using modulo (
%) operations and rounding the result usingMath.floor()to get approximate result.
Runnable example:
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const now = new Date().getTime();2
const futureDate = new Date('27 Jan 2030 16:40:00').getTime();3
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const timeleft = futureDate - now;5
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// convert milliseconds to seconds / minutes / hours etc.7
const msPerSecond = 1000;8
const msPerMinute = msPerSecond * 60;9
const msPerHour = msPerMinute * 60;10
const msPerDay = msPerHour * 24;11
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// calculate remaining time13
const days = Math.floor(timeleft / msPerDay);14
const hours = Math.floor((timeleft % (1000 * 60 * 60 * 24)) / msPerHour);15
const minutes = Math.floor((timeleft % (1000 * 60 * 60)) / msPerMinute);16
const seconds = Math.floor((timeleft % (1000 * 60)) / msPerSecond);17
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console.log(days + ' days ' + hours + ' hours ' + minutes + ' minutes ' + seconds + ' seconds left');