JavaScript | date.setMilliseconds() function

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

dateObj.setMilliseconds(milliseconds_Value);

DateObj is a valid Date object created using Date() constructor in which we want to set the millisecond. Value of millisecond is from 0 to 999.
Parameter: Here parameter is milliseconds_Value i.e, the value of millisecond which is used to set in date() constructor.
Return Values: It returns the new i.e updated millisecond which is set by setMilliseconds() function.

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// Here a date has been assigned
// while creating Date object
var dateobj = new Date('October 13, 1996 05:35:32:77');
  
// new millisecond of 52 is being set in above Date
// Object with the help of setMilliseconds() function
dateobj.setMilliseconds(52);
  
// new millisecond from above Date Object is
// being extracted using getMilliseconds()
var B = dateobj.getMilliseconds();
  
// Printing new millisecond
console.log(B);

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Output:

> 52

Errors and Exceptions

  • Code #1: If in Date() constructor we do not give any millisecond, still setMilliseconds() function set new millisecond which is given as its parameter.
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    // Here millisecond has not been assigned
    // while creating Date object
    var dateobj = new Date('October 13, 1996');
      
    // new millisecond of 51 is being set in above Date
    // Object with the help of setMilliseconds() function
    dateobj.setMilliseconds(51);
      
    // new millisecond from above Date Object is
    // being extracted using getMilliseconds()
    var B = dateobj.getMilliseconds();
      
    // Printing new millisecond
    console.log(B);

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    Output:

    > 51
  • Code #2: If nothing as parameter is given in Date() constructor, still setMilliseconds() function set millisecond but month, year, date etc become current ones.
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    // Here nothing has been assigned
    // while creating Date object
    var dateobj = new Date();
      
    // new millisecond of 42 is being set in above Date
    // Object with the help of setMilliseconds() function
    dateobj.setMilliseconds(42);
      
    // milliseconds from above Date Object is
    // being extracted using getMilliseconds()
    var B = dateobj.getMilliseconds();
      
    // 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();
      
    // year from above Date Object is
    // being extracted using getFullYear()
    var E = dateobj.getFullYear();
      
    // Printing new milliseconds
    console.log(B);
      
    // Printing current month
    console.log(C);
      
    // Printing current date
    console.log(D);
      
    // Printing current year
    console.log(E);

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    Output:

    > 42
    > 4
    > 1
    > 2018

    Here 42 is the new milliseconds, 4 is the current month i.e April, 1 is the current date and 2018 is the current year.

  • Code #3: If value of millisecond 1006 is given as the parameter of setMilliseconds() function, It will set 6 as the millisecond because millisecond range is form 0 to 999 and hence 1006-1000=6, here 1000 is substracted because 0 to 999 is 1000.
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    // Here date has been assigned
    // while creating Date object
    var dateobj = new Date('October 13, 1996 05:35:32:45');
      
    // new millisecond of 1006 is being set in above Date
    // Object with the help of setMilliseconds() function
    dateobj.setMilliseconds(1006);
      
    // milliseconds from above Date Object is
    // being extracted using getMilliseconds()
    var B = dateobj.getMilliseconds();
      
    // Second from above Date Object is
    // being extracted using getSeconds()
    var C = dateobj.getSeconds();
      
    // Printing new Milliseconds
    console.log(B);
      
    // Printing second
    console.log(C);

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    Output:

    > 6
    > 33

    Here 6 is the new millisecond and second becomes 33 from 32 because millisecond range is form 0 to 999 i.e, total 1000 and we set new millisecond as 1006 which increase second by one to 33 from 32 and millisecond becomes 6.



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