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JavaScript | date.getHours() Function

The date.getHours() is an inbuilt function in JavaScript which is used to return the hours from a given Date object.

Syntax:

DateObject.getHours()

In the above syntax the DateObject is a valid Date object.

Parameter: This function does not takes any parameter. It is just used along with a Date Object from which we want to fetch Hours.

Return Values: It returns the Hours for the given Date object. Hours is an integer value ranging from 0 to 23.



Below program illustrate the getHours() function:

// Here a date has been assigned 
// while creating Date object
var A = new Date('October 15, 1996 05:35:32');
  
// hour from above is being 
// extracted using getHours()
var B = A.getHours();
  
// Printing hour.
console.log(B);

Output:

5

Errors and Exceptions:
Program 1: Here date of the month must lie in between 1 to 31 because no date can have month greater than 31. That is why it returns NaN i.e, Not a Number if the month in the Date object is greater than 31. Hours will not be existed when date of the month given as 33 i.e, greater then 31.

// Creating a Date object
var A = new Date('October 35, 1996 12:35:32');
  
var B = A.getHours();
  
// Printing hour.
console.log(B);

Output:

NaN

Program 2: If hours is not given, it returns zero (0). It is an exception case.

// Creating a Date object
var A = new Date('October 12, 1996');
  
// extracting hours from the date object
var B = A.getHours();
  
// Printing hour.
console.log(B);

Output:

0

Program 3: If nothing as parameter is given, it returns present hours.

// Creating a Date object
var A = new Date();
  
var B = A.getHours();
  
// Printing present hour.
console.log(B);

Output:

15

Application: It has many applications such as getting current hour. Below program shows one of the application of this function. It gives the current Hour.

// Creating a Date object
var A = new Date();
  
// Getting present Hour
var B = A.getHours();
  
// Printing present hour.
console.log(B);

Output:

15


This article is attributed to GeeksforGeeks.org

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