Learn how to add one day to date in JavaScript using the native date object.

How to Add 1 Day to Date in JavaScript?

The best way to add 1 day to a JavaScript date is by using the Date object. On an existing Date, you can use the getDate function to get the day (between 1 and 31), add 1 to this number, then use setDate to update the date. Here's a short example: date.setDate(date.getDate() + 1).

Using the JavaScript Date Object

In JavaScript, you’ll often manipulate the Date object to do diverse operations (e.g., add days to a date, format a date, etc.).

If you want to add one day to date, you can use a combination of these two Date functions:

1. yourDate.getDate(): get the day of the month (you'll get a number between 1 and 31)

2. yourDate.setDate(): update the day of the date to the number passed as a parameter

In practice, let’s say you have this date: 05/12/2022. The getDate() function will return 5. Then you can add one day to this number 5 + 1 = 6. Finally, use setDate() to update the day of the month for your current date object.

Here’s a commented example:

// Create a date
const todayDate = new Date()

// Before adding 1 day
console.log(todayDate.toString())
// Output: "Wed Dec 21 2022 18:19:23 GMT+0100 (Central European Standard Time)"

// Add one day to the current date
todayDate.setDate(todayDate.getDate() + 1)

// After adding 1 day
console.log(todayDate.toString())
// Output: "Thu Dec 22 2022 18:19:23 GMT+0100 (Central European Standard Time)"Bonus: Create a Function to One Day to Date

Now you know how to add days to a date, let’s make your code fancy!

One way to do that is to create a function that takes a date as a parameter, adds one day, and returns it.

Following what we did in the last part, here’s how:

// Create a function to make the logic generic
const addOneDayToDate = (date) => {
  date.setDate(date.getDate() + 1)

  return date
}

// Get the current date
const date = new Date()

// Before adding 1 day
console.log(date.toString())
// Output: "Wed Dec 21 2022 18:24:38 GMT+0100 (Central European Standard Time)"

// Call `addOneDayToDate` with the current date
// and assign the result to a new variable called `tomorrowDate`
const tomorrowDate = addOneDayToDate(date);

// After adding 1 day
console.log(tomorrowDate.toString());
// Output: "Thu Dec 22 2022 18:24:38 GMT+0100 (Central European Standard Time)"

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