List of Supported Timezones
PHP Manual

List of timezones in the group Europe

Europe
Europe/Amsterdam Europe/Andorra Europe/Athens Europe/Belfast Europe/Belgrade
Europe/Berlin Europe/Bratislava Europe/Brussels Europe/Bucharest Europe/Budapest
Europe/Chisinau Europe/Copenhagen Europe/Dublin Europe/Gibraltar Europe/Guernsey
Europe/Helsinki Europe/Isle_of_Man Europe/Istanbul Europe/Jersey Europe/Kaliningrad
Europe/Kiev Europe/Lisbon Europe/Ljubljana Europe/London Europe/Luxembourg
Europe/Madrid Europe/Malta Europe/Mariehamn Europe/Minsk Europe/Monaco
Europe/Moscow Europe/Nicosia Europe/Oslo Europe/Paris Europe/Prague
Europe/Riga Europe/Rome Europe/Samara Europe/San_Marino Europe/Sarajevo
Europe/Simferopol Europe/Skopje Europe/Sofia Europe/Stockholm Europe/Tallinn
Europe/Tirane Europe/Tiraspol Europe/Uzhgorod Europe/Vaduz Europe/Vatican
Europe/Vienna Europe/Vilnius Europe/Volgograd Europe/Warsaw Europe/Zagreb
Europe/Zaporozhye Europe/Zurich

List of Supported Timezones
PHP Manual