JavaScript Date setMonth() Method

Difficulty Level : Easy
Last Updated : 01 Jul, 2020

Below is the example of Date setMonth() method.

Example:

<script>
   // Here a date has been assigned
   // while creating Date object
   var dateobj = 
   new Date('October 13, 1996 05:35:32');
  
   // new month of January is being set in above Date
   // Object with the help of setMonth() function
   dateobj.setMonth(0);
  
   // new month from above Date Object is
   // being extracted using getMonth()
   var B = dateobj.getMonth();
  
   // Printing new month
   document.write(B);
</script>

Output:
```
0
```

The date.setMonth() method is used to set month into a date object which is created using the Date() constructor.

Syntax:

DateObj.setMonth(month_Value);

Parameter: This method accept a single parameter as mentioned above and described below:

month_Value: This parameter holds 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() method.

Note: The DateObj is a valid Date object created using Date() constructor in which we want to set the month.The value of the 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 February, and so on till 11 for December.

More codes for the above method are as follows:

Program 1: If in Date() constructor we do not give any month while creating the date object, still setMonth() method will be able to set new month in the created date object.

<script>
   // 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() method
   dateobj.setMonth(2);
  
   // New month from above Date Object is
   // being extracted using getMonth()
   var B = dateobj.getMonth();
  
   // Printing new month
   document.write(B);
</script>

Output:

Program 2: If nothing as parameter is given in Date() constructor, still setMonth() method will be able to set month but year, date etc remains current ones. Here 11 is the new month of December, 1 is the current date and 2018 is the current year.

<script>
   // 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() method
   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
   document.write(B + "<br />");
  
   // Printing current date
   document.write(C + "<br />");
  
   // Printing current year
   document.write(D);
</script>

Output:

11
1
2018

Program 3: If value of month 15 is given as the parameter of setMonth() method, It will set 3 as the month because month range is from 0 to 11 and hence (15%12 = 3).
Here 3 is the new month of April and the year becomes 1997 from 1996 because the month range is from 0 to 11 i.e, total 12 and we set a new month as 3 which increases year by one to 1997 from 1996 and the month becomes 3.

<script>
   // 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
   document.write(B + "<br />");
  
   // Printing new year
   document.write(C);
</script>

Output:

3
1997

Supported Browsers: The browsers supported by JavaScript Date setMonth() method are listed below:

Google Chrome
Internet Explorer
Mozilla Firefox
Opera
Safari

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