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JavaScript | date.setUTCHours() function

The date.setUTCHours() is an inbuilt function in JavaScript which is used to set hours into a date object according to universal time which is created using the Date() constructor.

Syntax:

DateObj.setUTCHours(hours_Value);

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

Parameter: Here parameter hours_Value is the value of hour which is used to set in date object created using the date() constructor.

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



Below program illustrates the setUTCHours() function:

// Here a date has been assigned according to
// universal time while creating Date object
var dateobj = new Date('October 13, 1996 05:35:32 GMT-3:00');
  
// new hour 11 is being set in above Date
// Object with the help of setUTCHours() function
dateobj.setUTCHours(11);
  
// new hour from above Date Object is
// being extracted using getUTCHours()
var B = dateobj.getUTCHours();
  
// Printing new hour
console.log(B);

Output:

> 11

Errors and Exceptions

  • Code #1: If in Date() constructor we do not give hours while creating the Date object, still setUTCHours() function will be able to set new hour according to universal time which is given as its parameter in the created Date object.
    // Here hour has not been assigned according to
    // universal time while creating Date object
    var dateobj = new Date('October 13, 1996 GMT-3:00');
      
    // new hour 11 is being set in above Date
    // Object with the help of setUTCHours() function
    dateobj.setUTCHours(11);
      
    // new hour from above Date Object is
    // being extracted using getUTCHours()
    var B = dateobj.getUTCHours();
      
    // Printing new hour
    console.log(B);

    Output:

    > 11
  • Code #2: If nothing as parameter is given in Date() constructor, still setUTCHours() function will be able to set hour but month, year and date remains current ones according to universal time.
    // Here nothing has been assigned
    // while creating Date object
    var dateobj = new Date();
      
    // new hour 11 is being set in above Date
    // Object with the help of setUTCHours() function
    dateobj.setUTCHours(11);
      
    // hour from above Date Object is
    // being extracted using getUTCHours()
    var B = dateobj.getUTCHours();
      
    // month from above Date Object is
    // being extracted using getUTCMonth()
    var C = dateobj.getUTCMonth();
      
    // date from above Date Object is
    // being extracted using getUTCDate()
    var D = dateobj.getUTCDate();
      
    // year from above Date Object is
    // being extracted using getUTCFullYear()
    var E = dateobj.getUTCFullYear();
      
    // Printing new Hour
    console.log(B);
      
    // Printing current month
    console.log(C);
      
    // Printing current date
    console.log(D);
      
    // Printing current year
    console.log(E);

    Output:

    > 11
    > 2
    > 30
    > 2018

    Here 11 is the new hour, 2 is the current month i.e March, 30 is the current date and 2018 is the current year.

  • Code #3: If value of hour as 26 is given as the parameter of setHours() function, It will set 2 as the hour because hour range is form 0 to 23 and hence 26-24=2, here 24 is substracted because 0 to 23 is 24.
    // Here nothing has been assigned
    // while creating Date object
    var dateobj = new Date('October 13, 1996 05:35:32');
      
    // new hour 26 is being set in above Date
    // Object with the help of setUTCHours() function
    dateobj.setUTCHours(26);
      
    // hour from above Date Object is
    // being extracted using getUTCHours()
    var B = dateobj.getUTCHours();
      
    // month from above Date Object is
    // being extracted using getUTCMonth()
    var C = dateobj.getUTCMonth();
      
    // date from above Date Object is
    // being extracted using getUTCDate()
    var D = dateobj.getUTCDate();
      
    // year from above Date Object is
    // being extracted using getUTCFullYear()
    var E = dateobj.getUTCFullYear();
      
    // Printing new Hour
    console.log(B);
      
    // Printing month
    console.log(C);
      
    // Printing date
    console.log(D);
      
    // Printing year
    console.log(E);

    Output:

    > 2
    > 9
    > 14
    > 1996


This article is attributed to GeeksforGeeks.org

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