How to get the first day of the year in JavaScript ?

Given a date/year and the task is to get the first day of the year using JavaScript. 

Approach 1:

• Use getFullYear() Method to get the year from the given date.
• Use the new Date() function to create the new date object using year, month, and day.

Example: This example uses the getFullYear() method to get the full year of the current day and then get the first day of that year. 

Javascript

let date = new Date();

console.log("Today = " + date);

// Use Date(year, month, day) function
console.log(new Date(date.getFullYear(), 0, 1));

Output

Today = Mon Jun 12 2023 02:10:43 GMT+0000 (Coordinated Universal Time)
2023-01-01T00:00:00.000Z

Approach 2:

• Initialize the year to the variable (year = 2012).
• Use new Date() function to create the new date object using year, month and day.

Example: This example uses the year 2023 and then get the first day of that year. 

Javascript

let year = 2023;

console.log("Today's year = " + year);

// Use Date(year, month, day) function
// to get the first day of year
console.log(new Date(year, 0, 1));

Output

Today's year = 2023
2023-01-01T00:00:00.000Z