JavaScript: Add specified years to a date

JavaScript Datetime: Exercise-41 with Solution

Add Years to Date

Write a JavaScript function to add specified years to a date.

Test Data:
dt = new Date(2014,10,2);
console.log(add_years(dt, 10).toString());
Output:
"Sat Nov 02 2024 00:00:00 GMT+0530 (India Standard Time)"

Sample Solution:

JavaScript Code:

// Define a function add_years that adds a specified number of years (n) to a given Date object (dt)
function add_years(dt,n) 
 {
 // Set the full year of the provided date to the result of adding n years to its current full year
 return new Date(dt.setFullYear(dt.getFullYear() + n));      
 }

// Create a new Date object representing the current date and time
dt = new Date();
// Output the result of adding 10 years to the current date and time
console.log(add_years(dt, 10).toString());  

// Create a new Date object representing November 2, 2014
dt = new Date(2014,10,2);
// Output the result of adding 10 years to November 2, 2014
console.log(add_years(dt, 10).toString());

Output:

Tue Jun 20 2028 16:40:21 GMT+0530 (India Standard Time)
Sat Nov 02 2024 00:00:00 GMT+0530 (India Standard Time)

Explanation:

In the exercise above,

• The code defines a function called "add_years()" that takes two parameters:
• dt: A Date object representing a specific date.
• n: The number of years to add to the provided date.
• Inside the add_years function:
• It uses the "setFullYear()" method of the Date object ("dt") to modify its year component. It adds the specified number of years ('n') to the current year of the Date object.
• The "setFullYear()" method updates the year part of the date and returns the number of milliseconds since January 1, 1970, 00:00:00 UTC, representing the updated date.
• After defining the function, the code creates a new Date object "dt" representing the current date and time using 'new Date()'.
• It then calls the "add_years()" function with this Date object and the number 10 as arguments to add 10 years to the current date and time.
• Finally, it outputs the result of adding 10 years to the current date and time using console.log().
• Next, the code creates another new Date object "dt" representing November 2, 2014, using new Date(2014,10,2).
• It again calls the "add_years()" function with this Date object and the number 10 as arguments to add 10 years to November 2, 2014.
• Finally, it outputs the result of adding 10 years to November 2, 2014, using console.log().

Flowchart:

Live Demo:

See the Pen JavaScript - Add specified years to a date-date-ex-41 by w3resource (@w3resource) on CodePen.

For more Practice: Solve these Related Problems:

• Write a JavaScript function that adds a specified number of years to a Date object using setFullYear() and returns the new date.
• Write a JavaScript function that handles leap years correctly when adding years to a date.
• Write a JavaScript function that validates the input years before adding them to a Date object.
• Write a JavaScript function that formats the updated Date object into a readable string after adding years.

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