Programming Tutorials
JavaScript: Add Days to a Date
While working with dates in JavaScript, we often need to change the dates, like adding or subtracting days to date before processing it. While adding days to a date, we expect the month and year values to be incremented accordingly depending on the number of days being added. This article will discuss practical ways to add days to a javascript date.
Add Days to a Date Value using setDate()
According to the local time, Javascript’s setDate() will set the day of the month of the specified Date instance.
Javascript’s getDate() will get the particular day of the month as per the specified date according to local time.
Add three days to today’s date
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Explanation:-
- We first get today’s date from the system using the new Date() .
- Access the current day of the month using the getDate() method.
- The new v alue of the day of the month is set in the setDate() method. The arguments passed in this method are the date value received in the previous step and the number of days we want to increase (3 in our case). If the value of month and year needs to be updated, they are incremented accordingly by the setDate() method.
- Finally, the Date() constructor creates a new date with the day, month, and year values decided by the number of days being added.
Add Days to a Date Value using setTime()
Javascript’s setTime() will set the Date object to the time represented by the milliseconds since January 1, 1970, 00:00:00
Javascript’s getTime() will get the numbe r of milliseconds since ECMASCRIPT epoch
- We first get today’s dat e from the system using the new Date() .
- Access the number of milliseconds representing a particular date with the method getTime() .
- In the variable addMilliseconds , we add the number of milliseconds received in the above step and the milliseconds’ value for the number of days (_noOfDays * 24 * 60 * 60 * 1000) we wish to add in a particular date.
- The addMilliseconds variable value is then passed as an argument to method setTime(). If the value of month and year needs to be updated, they are incremented accordingly by the setTime() method.
- Finally, the Date() constructor creates a ne w date.
Add Days to a Date Value by Accessing Properties of a Date
Javascript’s getFullYear() method will return the year of the date specified according to the local time .
Javascript’s getMonth() method will return the mon th of the date specified according to the local time . The month value is zero-based that is zero indicates the first month of the year.
Javascript’s getDate() method will return the day of the month of the date specified according to the local time .
Javascript’s toDateString() method will return the portion of Date in English in the format:
- First four letters for the day of the weekday .
- First three letters of the month’s name.
- Two digits of the day of the month .
- Four digits for the year .
- We first get today’s date from the system using the new Date() .
- Then we access different properties of the date.
- getFullYear() method gets the year from today’s date.
- getMonth() method receives the current month from today’s date.
- getDate() method receives the day from today’s date.
- After accessing all the above values, create a new date by Date() constructor, which sets the value of the day, month, and year based on how many days we are adding to the current date.
I hope this article helped you add the number of days to a javascript date. Good Luck !!!
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How to add days to a date in JavaScript
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How to add days to today? javascript
How to add days to today in day-month-year format? I tried this code but additionally get the time zone and month in the short word name. I want to receive, for example, August 12, 2023 here is the code:
Date.prototype.addDays = function(days) { var date = new Date(this.valueOf()); date.setDate(date.getDate() + days); return date; } var date = new Date(); console.log(date.addDays(5));
- Already answered here: stackoverflow.com/questions/1197928/… – aggregate1166877 Jul 10, 2022 at 11:23
- Does this answer your question? How do I format a date in JavaScript? – Muhammad Khuzaima Umair Jul 10, 2022 at 11:30
4 Answers 4
To get the format: Month Day, Year , Simply use ECMAScript Internationalization API :
Note: 'long' uses the full name of the month, 'short' for the short name,
Create an array of months
In the function Date.prototype.addDays , return the date string as
Your question is twofold:
- how to add days to a date
- and how to format a date
1. adding days
the easiest way to do simple calculations with date and time values is to transform all date and time into UNIX timestamps (number of milliseconds since the january 1st 1970 epoch) then adding and substracting days or calculating date differences is simply adding and substracting integer numbers.
For example.
to obtain the unix time of right now just use Date.now() which is 1657452836534 five days in millisecods is 5*24*60*60*1000 thus five days ahead of now is Date.now() + 5*24*60*60*1000 which is 1657884836534 to obtain a Date object, you need to create one with the timestamp value new Date(Date.now() + 5*24*60*60*1000)
2. format Date
formatting Dates is more complex that it seems, as there are some subtle issues around, depending on users cultural conventions. See How do I format a date in JavaScript? for a detailed answer. But as a show answer if you want your code to work for any user, the easiest way it to use native javascript toLocaleDateString() function. See https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/toLocaleDateString .
wrapping up, for your case, try
You are adding 2 dates in the correct way, there is the only problem in outputting the date in desired format. You can format the date as follow based on this answer :
Date.prototype.addDays = function(days) { var date = new Date(this.valueOf()); date.setDate(date.getDate() + days); // return formatted date var options = {year: 'numeric', month: 'long', day: 'numeric' }; return date.toLocaleDateString("en-US", options); } var date = new Date(); console.log(date.addDays(5));
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Related tutorials, how to add days to a date in javascript.
In this tutorial, we are going to learn about how to add days to the current date in JavaScript using the new Date() constructor.
Adding days to current Date
- To add the days to a current date, first we need to access it inside the JavaScript using the new Date() constructor .
- Now, we can add the required number of days to a current date using the combination of setDate() and getDate() methods.
Full example:
Definitions
- The setDate() method sets the day of the month to a Date object.
- The getDate() method gets the current day of the month (from 1 - 31).
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According to the local time, Javascript's setDate() will set the day of the month of the specified Date instance. Javascript's getDate() will get the particular day of the month as per the specified date according to local time
To add days to a date in JavaScript. For example, to add one day to the current date, use the following code. To update an existing JavaScript Date object, you can do the following
Add days to javascript date - JavaScript provides the Date object for manipulating date and time. In between the various methods of the Date object, will be focusing in this post are the setDate(value) and
The Date is a built-in object in JavaScript. Once a Date object is created with the New Date(), a set of methods become available to operate on it. These methods allow getting and setting the year
To get the format: Month Day, Year, Simply use ECMAScript Internationalization API. the easiest way to do simple calculations with date and time values is to transform all date and time into UNIX timestamps
To add the days to a current date, first we need to access it inside the JavaScript using the new Date() constructor. const current = new Date ( ) ;Now, we can add the required number of days to a current date
Test your JavaScript, CSS, HTML or CoffeeScript online with JSFiddle code editor. Then click the Button to see how 3 days is added to this Date and shown in "Follow Date" TextBox. </ h2 >