Lista de Timezones Suportados
PHP Manual

Others

Others
Brazil/Acre Brazil/DeNoronha Brazil/East Brazil/West Canada/Atlantic
Canada/Central Canada/East-Saskatchewan Canada/Eastern Canada/Mountain Canada/Newfoundland
Canada/Pacific Canada/Saskatchewan Canada/Yukon CET Chile/Continental
Chile/EasterIsland CST6CDT Cuba EET Egypt
Eire EST EST5EDT Etc/GMT Etc/GMT+0
Etc/GMT+1 Etc/GMT+10 Etc/GMT+11 Etc/GMT+12 Etc/GMT+2
Etc/GMT+3 Etc/GMT+4 Etc/GMT+5 Etc/GMT+6 Etc/GMT+7
Etc/GMT+8 Etc/GMT+9 Etc/GMT-0 Etc/GMT-1 Etc/GMT-10
Etc/GMT-11 Etc/GMT-12 Etc/GMT-13 Etc/GMT-14 Etc/GMT-2
Etc/GMT-3 Etc/GMT-4 Etc/GMT-5 Etc/GMT-6 Etc/GMT-7
Etc/GMT-8 Etc/GMT-9 Etc/GMT0 Etc/Greenwich Etc/UCT
Etc/Universal Etc/UTC Etc/Zulu Factory GB
GB-Eire GMT GMT+0 GMT-0 GMT0
Greenwich Hongkong HST Iceland Iran
Israel Jamaica Japan Kwajalein Libya
MET Mexico/BajaNorte Mexico/BajaSur Mexico/General MST
MST7MDT Navajo NZ NZ-CHAT Poland
Portugal PRC PST8PDT ROC ROK
Singapore Turkey UCT Universal US/Alaska
US/Aleutian US/Arizona US/Central US/East-Indiana US/Eastern
US/Hawaii US/Indiana-Starke US/Michigan US/Mountain US/Pacific
US/Pacific-New US/Samoa UTC W-SU WET
Zulu        
Aviso

Por favor não use nenhuma das zonas de horario listadas aqui (alem de UTC), elas só existem por motivo de compatibilidade com versões anteriores.


Lista de Timezones Suportados
PHP Manual