(PHP 5 >= 5.1.0, PHP 7, PHP 8)
date_default_timezone_set — Sets the default timezone used by all date/time functions in a script
$timezoneId): booldate_default_timezone_set() sets the default timezone used by all date/time functions.
Instead of using this function to set the default timezone in your script, you can also use the INI setting date.timezone to set the default timezone.
timezoneId
The timezone identifier, like UTC,
Africa/Lagos, Asia/Hong_Kong, or
Europe/Lisbon. The list of valid identifiers is
available in the List of Supported Timezones.
This function returns false if the
timezoneId isn't valid, or true
otherwise.
Example #1 Getting the default timezone
<?php
date_default_timezone_set('America/Los_Angeles');
$script_tz = date_default_timezone_get();
if (strcmp($script_tz, ini_get('date.timezone'))){
echo 'Script timezone differs from ini-set timezone.';
} else {
echo 'Script timezone and ini-set timezone match.';
}
?>
A simple method for conversation between two time zone.
<?php
$date = new DateTime("2012-07-05 16:43:21", new DateTimeZone('Europe/Paris'));
date_default_timezone_set('America/New_York');
echo date("Y-m-d h:iA", $date->format('U'));
// 2012-07-05 10:43AM
?>
