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JavaScript getTimezoneOffset(): Find the Difference Between UTC and Local Time
The JavaScript getTimezoneOffset() method is used when we need to find the difference between UTC (same as GMT) and local time. For example:
<!DOCTYPE html> <html> <body> <p id="xyz"></p> <script> const d = new Date(); let timeDifference = d.getTimezoneOffset(); document.getElementById("xyz").innerHTML = timeDifference; </script> </body> </html>
In the above example, the following JavaScript statement:
const d = new Date();
creates a new "Date" object with the "new Date()" constructor. This method generates a new date and time object using the current system clock time.
Then the following JavaScript statement:
let timeDifference = d.getTimezoneOffset();
calls the Date object's getTimezoneOffset() method to obtain the time zone offset in minutes between the user's local time zone and UTC. A negative value means the local time zone is behind UTC, while a positive value means it is ahead of UTC. The time zone offset value obtained is saved in the timeDifference variable.
Finally, the following JavaScript statement:
document.getElementById("xyz").innerHTML = timeDifference;
JavaScript getTimezoneOffset() syntax
The syntax of the getTimezoneOffset() method in JavaScript is:
x.getTimezoneOffset()
where x must be an object of the Date() constructor.
The getTimezoneOffset() method returns a number, which will be the time difference between UTC and local time in minutes.
Please note: To display the date in the format dd-mm-yyyy, refer to its separate example.
Please note: To display time in the format hh:mm:ss, refer to its separate example.
Please note: To display time in the format hh:mm:ss AM/PM, refer to its separate example.
Advantages of the getTimezoneOffset() method in JavaScript
- The getTimezoneOffset() method is a built-in JavaScript function that is widely supported across browsers, making it simple to use for calculating the time zone offset between the user's local time zone and UTC.
- It returns the time zone offset in minutes, which can easily be converted to other time units if necessary.
- It's a quick and easy way to get the time zone offset because it doesn't require any third-party libraries or APIs.
Disadvantages of the getTimezoneOffset() method in JavaScript
- The getTimezoneOffset() method returns the user's system time zone offset, which may or may not be accurate. For example, if the user has manually changed the time zone on their system clock, the method may return an incorrect value.
- It does not provide any information about the time zone's actual name or abbreviation, which may be required in some applications.
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