In today's fast-paced digital world, it is essential to stay updated with the latest technology trends. One of the most important aspects of web development is understanding PHP and its functions. In this article, we will discuss the PHP function "date_default_timezone_set" and its significance in web development.

What is the "date_default_timezone_set" function?

The "date_default_timezone_set" function is a PHP function used to set the default timezone used by all date/time functions in a script. By default, PHP uses the server's timezone, but this function allows you to set a different timezone based on your needs.

Why is the "date_default_timezone_set" function important?

When developing a web application, it is crucial to ensure that all date/time functions are accurate and reliable. This function allows you to set the timezone for your application, ensuring that all date/time functions are accurate and consistent across all platforms.

How to use the "date_default_timezone_set" function

The syntax for using the "date_default_timezone_set" function is as follows:

date_default_timezone_set(string $timezone_identifier)

The parameter $timezone_identifier is a string that represents the timezone to be set. It can be any of the supported timezones in PHP. For example:


This code sets the default timezone to Eastern Standard Time (EST) in the United States.

List of supported timezones in PHP

PHP supports a wide range of timezones from around the world. Here is a list of some of the most commonly used timezones in PHP:

  • America/New_York
  • America/Chicago
  • America/Denver
  • America/Los_Angeles
  • Europe/London
  • Europe/Paris
  • Asia/Tokyo
  • Asia/Singapore
  • Australia/Sydney

Examples of using the "date_default_timezone_set" function

Here are some examples of how you can use the "date_default_timezone_set" function in your PHP scripts:


// Set timezone to New York

// Get the current date and time in New York
echo date('Y-m-d H:i:s');

// Set timezone to Tokyo

// Get the current date and time in Tokyo
echo date('Y-m-d H:i:s');


In conclusion, the "date_default_timezone_set" function is an essential function in PHP web development. By using this function, you can ensure that all date/time functions in your script are accurate and consistent across all platforms. We hope that this article has been informative and helpful to you.

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