How to Get a List of Time Zones in PHP?

Get a List of All Available Time Zones

To create a list of all time zones supported by PHP, you can pass DateTimeZone::ALL to DateTimeZone::listIdentifiers() as the first argument, for example, in the following way:

$timeZones = DateTimeZone::listIdentifiers(DateTimeZone::ALL);

foreach ($timeZones as $timeZone) {
    echo $timeZone;
}

Get a List of All Available Time Zones Per Country

You can specify the second argument to the DateTimeZone::listIdentifiers() method as a two-letter ISO 3166-1 compatible country code to get a list of all time zones available per country. However, this only works when the first argument to the method is DateTimeZone::PER_COUNTRY. For example:

$timezones = DateTimeZone::listIdentifiers(DateTimeZone::PER_COUNTRY, 'US');

foreach ($timezones as $timezone) {
	echo $timezone;
}

Single or Groups of Time Zones Based on DateTimeZone Class Constants

The DateTimeZone class supports the following constants:

• DateTimeZone::AFRICA;
• DateTimeZone::AMERICA;
• DateTimeZone::ANTARCTICA;
• DateTimeZone::ARCTIC;
• DateTimeZone::ASIA;
• DateTimeZone::ATLANTIC;
• DateTimeZone::AUSTRALIA;
• DateTimeZone::EUROPE;
• DateTimeZone::INDIAN;
• DateTimeZone::PACIFIC;
• DateTimeZone::UTC.

Using those, you can get time zones for a single region like so:

$timeZones = DateTimeZone::listIdentifiers(DateTimeZone::AMERICA);

foreach ($timeZones as $timeZone) {
    echo $timeZone;
}

These DateTimeZone constants can also be combined together, for example, in the following way:

$timeZones = DateTimeZone::listIdentifiers(DateTimeZone::AMERICA|DateTimeZone::ASIA);

foreach ($timeZones as $timeZone) {
    echo $timeZone;
}