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JavaScript: Get difference to Greenwich time in hours

JavaScript Datetime: Exercise-39 with Solution

Write a JavaScript function to get difference to Greenwich time (GMT) in hours.

Test Data :
dt = new Date();
console.log(diff_to_GMT(dt));
"+05.500"

Sample Solution:-

HTML Code:

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>JavaScript function to get difference to Greenwich time (GMT) in hours.</title>
</head>
<body>

</body>
</html>

JavaScript Code:


function diff_to_GMT(dt) 
{ 
   return (-dt.getTimezoneOffset() < 0 ? '-' : '+') + (Math.abs(dt.getTimezoneOffset() / 60) < 10 ? '0' : '') + (Math.abs(dt.getTimezoneOffset() / 60)) + '00';
}

dt = new Date(); 
console.log(diff_to_GMT(dt)); 

dt = new Date(1989, 10, 1); 
console.log(diff_to_GMT(dt));

Sample Output:

+05.500
+05.500

Flowchart:

Flowchart: JavaScript- Get difference to Greenwich time in hours

Live Demo:

See the Pen JavaScript - Get difference to Greenwich time in hours-date-ex-39 by w3resource (@w3resource) on CodePen.


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JavaScript: Tips of the Day

Add padding to the beginning of a string

const name = 'Minta Lofton';
console.log(name.padStart(13));
console.log(name.padStart(2));

With the padStart method, we can add padding to the beginning of a string. The value passed to this method is the total length of the string together with the padding. The string "Minta Lofton" has a length of 12. name.padStart(13) inserts 1 space at the start of the string, because 12 + 1 is 13.
If the argument passed to the padStart method is smaller than the length of the array, no padding will be added.

Ref: https://bit.ly/3jFRBje