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# PHP Function date_default_timezone_set()

## Syntax

bool date_default_timezone_set ( string $timezone_identifier )

## Definition and Usage

Sets the default timezone used by all date/time functions in a script.

## Paramters

Parameter | Description
--- | ---
timezone_identifier | A valid timezone string

## Return Value

Returns FALSE if the timezone_identifier isn't valid, or TRUE otherwise.

## Example

Following is the usage of this function:

    <?php
       echo "Old time zone is ". date_default_timezone_get();
       $timeZone = 'America/Costa_Rica';
       if( date_default_timezone_set( $timeZone) ){
          # Now get this time zone.
          echo "New time zone is ". date_default_timezone_get();
       }
    ?>

This will produce following result:

    Old time zone is America/Denver
    New time zone is America/Costa_Rica

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