JavaScript | date.setDate() function

The date.setDate() is an inbuilt function in JavaScript which is used to set date of a month into a date object which are created using date() constructor.
Syntax:

dateObj.setDate(date_Value);

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

Parameter: Here parameter is date_Value i.e, the value of date which is used to set in date() constructor.
Return values: It returns the new i.e updated date of the month which is set by setDate() function. The date of the month is an integer value ranging from 1 to 31.



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<script>
// Here a date has been assigned
// while creating Date object
var dateobj = new Date('October 13, 1996 05:35:32');
  
// new date 15 of the month is being set in above Date
// Object with the help of setDate() function
dateobj.setDate(15);
  
// new date of the month from above Date Object is
// being extracted using getDate()
var B = dateobj.getDate();
  
// Printing new date of the month
document.write(B);
</script>

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Output:

15

Errors and Exceptions

  • Example 1: Here as we know that date of the month lies in between 1 to 31 but if we suppose to set date of 33, it will set date 2 for the next month because 33-31=2 and this date 2 becomes date for next of the previous month.
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    <script>
    // Here a date has been assigned
    // while creating Date object
    var dateobj = new Date('October 13, 1996 05:35:32');
      
    // new date 33 of the month is being set in above Date
    // Object with the help of setDate() function
    dateobj.setDate(33);
      
    // new date of the month from above Date Object is
    // being extracted using getDate()
    var B = dateobj.getDate();
      
    // new month from above Date Object is
    // being extracted using getMonth()
    var C = dateobj.getMonth();
      
    // Printing new date of the month
    document.write(B);
      
    // Printing new month
    document.write(C);
    </script>

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    Output:

    2
    10

    In above output 2 is date of the November month and 10 is the month of November because month name start from 0 to 11 i.e, 0 for January and 11 for December.

  • Example 2: If in Date() constructor we do not give any date of the month, still setDate() function set new date which is given as its parameter.
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    <script>
    // Here date has not been assigned
    // while creating Date object
    var dateobj = new Date('October, 1996 05:35:32');
      
    // new date 12 of the month is being set in above Date
    // Object with the help of setDate() function
    dateobj.setDate(12);
      
    // new date of the month from above Date Object is
    // being extracted using getDate()
    var B = dateobj.getDate();
      
    // Printing new date of the month
    document.write(B);
    </script>

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    Output:

    12
    
  • Example 3: If nothing as parameter is given in Date() constructor, still setDate() function set date but month becomes current month.
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    <script>
    // Here a date has been assigned
    // while creating Date object
    var dateobj = new Date();
      
    // new date 13 of the month is being set in above Date
    // Object with the help of setDate() function
    dateobj.setDate(13);
      
    // date of the month from above Date Object is
    // being extracted using getDate()
    var B = dateobj.getDate();
      
    // month from above Date Object is
    // being extracted using getMonth()
    var C = dateobj.getMonth();
      
    // Printing new date of the month
    document.write(B + "<br>");
      
    // Printing new month
    document.write(C);                    
    </script>

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    Output:

    13
    2
    
  • Example 4: If new date of the month set to zero (0), the new date will be set to the last day of the previous month.
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    <script>
    // Here a date has been assigned
    // while creating Date object
    var dateobj = new Date('October 13, 1996 05:35:32');
      
    // new date 0 of the month is being set in above Date
    // Object with the help of setDate() function
    dateobj.setDate(0);
      
    // date of the month from above Date Object is
    // being extracted using getDate()
    var B = dateobj.getDate();
      
    // month from above Date Object is
    // being extracted using getMonth()
    var C = dateobj.getMonth();
      
    // Printing new date of the month
    document.write(B + "<br>");
      
    // Printing new month
    document.write(C);
    </script>

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    Output:

    30
    8
    

Supported Browsers: The browsers supported by JavaScript date.setDate() Function are listed below:

  • Google Chrome
  • Internet Explorer
  • Firefox
  • Opera
  • Safari


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