date_default_timezone_get
date_diff
Date/Time Functions
PHP Manual

# date_default_timezone_set

(PHP 5 >= 5.1.0)

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

### Descripción

bool date_default_timezone_set ( string `$timezone_identifier` )

date_default_timezone_set() sets the default timezone used by all date/time functions.

> Note: Since PHP 5.1.0 (when the date/time functions were rewritten), every call to a date/time function will generate a `E_NOTICE` if the timezone isn't valid, and/or a `E_WARNING` message if using the system settings or the TZ environment variable.

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.

### Lista de parámetros

`timezone_identifier`

  The timezone identifier, like UTC or Europe/Lisbon. The list of valid identifiers is available in the List of Supported Timezones.

### Valores retornados

This function returns `FALSE` if the `timezone_identifier` isn't valid, or `TRUE` otherwise.

### Ejemplos

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.';
}
?>`

### Registro de cambios

Versión | Descripción
--- | ---
5.3.0 | Now throws `E_WARNING` rather then `E_STRICT`.
5.1.2 | The function started to validate the `timezone_identifier` parameter.

### Ver también

- date_default_timezone_get() - Gets the default timezone used by all date/time functions in a script

date_default_timezone_get
date_diff
Date/Time Functions
PHP Manual