published: 20 Sep 2022
2 min read
How to add hours to a date in JavaScript
To add hours to date in JavaScript:
- Use the
getTime()method to get the number of milliseconds since Unix Epoch. - Call the
setTime()method and pass it the number of milliseconds returned bygetTime(), plus the hours you want to add in milliseconds.
The following example demonstrates how you can add 4 hours to the current date in JavaScript:
const today = new Date()
today.setTime(today.getTime() + 4 * 60 * 60 * 1000)
console.log(today)
// Sat Sep 10 2022 11:24:04 GMT+0500 (Pakistan Standard Time)
The getTime() method returns the number of milliseconds elapsed between January 1st, 1970, at 00:00:00 UTC and the given date.
The setTime() method takes a number as input representing the milliseconds since January 1st, 1970, at 00:00:00 UTC and sets the value on the given date.
We multiplied the number of hours by 60 * 60 * 1000 to convert them to milliseconds before passing the value to the setTime() method.
The above methods also take care of the scenario where adding a specific number of hours to date results in the next day, month, or year:
const date = new Date('2022-09-10T16:23:23.900Z')
// Add 10 hours
date.setTime(date.getTime() + 10 * 60 * 60 * 1000)
console.log(date.toUTCString())
// Sun, 11 Sep 2022 02:23:23 GMT
You can also add a method to the Date's prototype that adds the given number of hours to the current date:
Date.prototype.addHours = function (hours) {
const date = new Date(this.valueOf())
date.setTime(date.getTime() + hours * 60 * 60 * 1000)
return date
}
const date = new Date('2022-09-10T16:23:23.900Z')
// Add 12 Hours
const result = date.addHours(12)
console.log(result.toUTCString())
// Sun, 11 Sep 2022 04:23:23 GMT
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How to add hours to a date in JavaScript
To add hours to date in JavaScript:
- Use the
getTime()method to get the number of milliseconds since Unix Epoch. - Call the
setTime()method and pass it the number of milliseconds returned bygetTime(), plus the hours you want to add in milliseconds.
The following example demonstrates how you can add 4 hours to the current date in JavaScript:
const today = new Date()
today.setTime(today.getTime() + 4 * 60 * 60 * 1000)
console.log(today)
// Sat Sep 10 2022 11:24:04 GMT+0500 (Pakistan Standard Time)
The getTime() method returns the number of milliseconds elapsed between January 1st, 1970, at 00:00:00 UTC and the given date.
The setTime() method takes a number as input representing the milliseconds since January 1st, 1970, at 00:00:00 UTC and sets the value on the given date.
We multiplied the number of hours by 60 * 60 * 1000 to convert them to milliseconds before passing the value to the setTime() method.
The above methods also take care of the scenario where adding a specific number of hours to date results in the next day, month, or year:
const date = new Date('2022-09-10T16:23:23.900Z')
// Add 10 hours
date.setTime(date.getTime() + 10 * 60 * 60 * 1000)
console.log(date.toUTCString())
// Sun, 11 Sep 2022 02:23:23 GMT
You can also add a method to the Date's prototype that adds the given number of hours to the current date:
Date.prototype.addHours = function (hours) {
const date = new Date(this.valueOf())
date.setTime(date.getTime() + hours * 60 * 60 * 1000)
return date
}
const date = new Date('2022-09-10T16:23:23.900Z')
// Add 12 Hours
const result = date.addHours(12)
console.log(result.toUTCString())
// Sun, 11 Sep 2022 04:23:23 GMT
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