JavaScript | date.setFullYear() Function

The date.setFullYear() is an inbuilt function in JavaScript which is used to set year into a date object which is created using Date() constructor.

Syntax:

DateObj.setFullYear(year_Value)

DateObj is a valid Date object created using Date() constructor in which we want to set the year.

Parameter: Here parameter year_Value is the value of year which is used to set in Date() constructor.

Return Value: It returns the new date with updated year which is set by setFullYear() function.



Below program illustrates the setFullYear() function:

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// Here a date has been assigned
// while creating Date object
var dateobj = new Date('October 13, 1996 05:35:32');
  
// new year 1992 is being set in above Date
// Object with the help of setFullYear() function
dateobj.setFullYear(1992);
  
// new year from above Date Object is
// being extracted using getFullYear()
var B = dateobj.getFullYear();
  
// Printing new year
console.log(B);

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Output:

1992

Errors and Exceptions

  • Code #1: If in Date() constructor we do not give any year, still setFullYear() function set new year which is given as its parameter.
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    // Here year has not been assigned
    // while creating Date object
    var dateobj = new Date('October 13, 05:35:32');
      
    // new year 1992 is being set in above Date
    // Object with the help of setFullYear() function
    dateobj.setFullYear(1992);
      
    // new year from above Date Object is
    // being extracted using getFullYear()
    var B = dateobj.getFullYear();
      
    // Printing new year
    console.log(B);

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    Output:

    1992
  • Code #2: If nothing as parameter is given in Date() constructor, still setFullYear() function set year but month and date become current ones.
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    // Here nothing has been assigned
    // while creating Date object
    var dateobj = new Date();
      
    // new year 2007 is being set in above Date
    // Object with the help of setFullYear() function
    dateobj.setFullYear(2007);
      
    // Year from above Date Object is
    // being extracted using getFullYear()
    var B = dateobj.getFullYear();
      
    // month from above Date Object is
    // being extracted using getMonth()
    var C = dateobj.getMonth();
      
    // date from above Date Object is
    // being extracted using getDate()
    var D = dateobj.getDate();
      
    // Printing new year
    console.log(B);
      
    // Printing current month
    console.log(C);
      
    // Printing current date
    console.log(D);

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    Output:

    2007
    2
    30
    

    Here in output 2 is the month of March because month name start from 0 to 11 i.e, 0 for January and 11 for December.
    And 30 is the current date.



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