JavaScript | date.setMonth() function

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

Syntax:

DateObj.setMonth(month_Value);

DateObj is a valid Date object created using Date() constructor in which we want to set the month.Value of month is from 0 to 11 because the total number of months in a year is 12 from January to December.Value 0 is used for January, 1 for Febuary and so on till 11 for December.

Parameter: Here parameter month_Value is the value of month which we want to set in the date created using the Date() constructor.

Return Values: It returns the new i.e updated month which is set by setMonth() function.

Below program illustrates the setMonth() function:

Output:

> 0

Errors and Exceptions

• Code #1: If in Date() constructor we do not give any month while creating the date object, still setMonth() function will be able to set new month in the created date object.
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  // Here month has not been assigned // while creating Date object var dateobj = new Date('1996, 05:35:32');    // new month of 2 is being set in above Date // Object with the help of setMonth() function dateobj.setMonth(2);    // new month from above Date Object is // being extracted using getMonth() var B = dateobj.getMonth();    // Printing new month console.log(B);

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  Output:

  > 2

• Code #2: If nothing as parameter is given in Date() constructor, still setMonth() function will be able to set month but year, date etc remains current ones.
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  // Here nothing has been assigned // while creating Date object var dateobj = new Date();    // new month of 11 is being set in above Date // Object with the help of setMonth() function dateobj.setMonth(11);    // Month from above Date Object is // being extracted using getMonth() var B = dateobj.getMonth();    // date from above Date Object is // being extracted using getDate() var C = dateobj.getDate();    // year from above Date Object is // being extracted using getFullYear() var D = dateobj.getFullYear();    // Printing new month console.log(B);    // Printing current date console.log(C);    // Printing current year console.log(D);

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  Output:

  > 11
  > 1
  > 2018

  Here 11 is the new month of December, 1 is the current date and 2018 is the current year.

• Code #3: If value of month 15 is given as the parameter of setMonth() function, It will set 3 as the month because month range is form 0 to 11 and hence (15%12 = 3).
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  // Here date has been assigned // while creating Date object var dateobj = new Date('October 13, 1996 05:35:32');    // new month of 15 is being set in above Date // Object with the help of setMonth() function dateobj.setMonth(15);    // month from above Date Object is // being extracted using getMonth() var B = dateobj.getMonth();    // year from above Date Object is // being extracted using getFullYear() var C = dateobj.getFullYear();    // Printing new month console.log(B);    // Printing new year console.log(C);

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  Output:

  > 3
  > 1997

  Here 3 is the new month of April and year becomes 1997 from 1996 because month range is form 0 to 11 i.e, total 12 and we set new month as 3 which increase year by one to 1997 from 1996 and month becomes 3.

Kanchan_Ray

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