PHP Timezones

# (GMT-10:00) Hawaiian/Aleutian Time
Pacific/Honolulu

# (GMT-08:00) Alaska Time
America/Anchorage

# (GMT-07:00) Pacific Time (US)
America/Los_Angeles

# (GMT-07:00) Mountain Time (Arizona)
America/Phoenix

# (GMT-06:00) Mountain Time (US)
America/Denver

# (GMT-05:00) Central Time (US)
America/Chicago

# (GMT-04:00) Eastern Time (US)
America/New_York

# (GMT-05:00) Central Time (Indiana)
America/Indiana/Knox

# (GMT-04:00) Eastern Time (Indiana)
America/Indiana/Indianapolis

# (GMT-06:00) Central Time (Saskatchewan)
America/Regina

# (GMT-05:00) Central Time (Mexico City, Monterey)
America/Monterrey

# (GMT-05:00) UTC/GMT -5 hours
America/Lima

# (GMT-04:00) Atlantic Time
America/Manaus

# (GMT-04:00) Atlantic Time (Puerto Rico)
America/Puerto_Rico

# (GMT-03:00) Western Greenland Time
America/Thule

# (GMT-03:00) Eastern Brazil
America/Sao_Paulo

# (GMT-02:30) Newfoundland Time
America/St_Johns

# (GMT-02:00) Central Greenland Time
America/Godthab

# (GMT-02:00) GMT-2:00
Etc/GMT+2

# (GMT+00:00) Eastern Greenland Time
America/Scoresbysund

# (GMT+00:00) Western European Time (Iceland)
Atlantic/Reykjavik

# (GMT+00:00) UTC
UTC

# (GMT+01:00) British Time (London)
Europe/London

# (GMT+01:00) GMT+1:00
Etc/GMT-1

# (GMT+01:00) Western European Time (Lisbon)
Europe/Lisbon

# (GMT+02:00) Western European Time
Europe/Paris

# (GMT+02:00) Central European Time
Europe/Berlin

# (GMT+03:00) Eastern European Time
Europe/Bucharest

# (GMT+02:00) South Africa Standard Time
Africa/Johannesburg

# (GMT+03:00) Eastern Africa Time
Africa/Kampala

# (GMT+03:00) Moscow
Etc/GMT-3

# (GMT+04:30) Iran Standard Time
Asia/Tehran

# (GMT+04:00) UAE (Dubai)
Asia/Dubai

# (GMT+05:00) Pakistan Standard Time (Karachi)
Asia/Karachi

# (GMT+05:30) India
Asia/Calcutta

# (GMT+06:00) Bangladesh Standard Time
Asia/Dhaka

# (GMT+07:00) Western Indonesian Time (Jakarta)
Asia/Jakarta

# (GMT+07:00) Thailand (Bangkok)
Asia/Bangkok

# (GMT+08:00) Hong Kong
Asia/Hong_Kong

# (GMT+08:00) Singapore
Asia/Singapore

# (GMT+08:00) Australian Western Time
Australia/West

# (GMT+09:00) Tokyo
Asia/Tokyo

# (GMT+09:30) Australian Central Time (Northern Territory)
Australia/North

# (GMT+09:30) Australian Central Time (Adelaide)
Australia/Adelaide

# (GMT+10:00) Australian Eastern Time (Queensland)
Australia/Queensland

# (GMT+10:00) Australian Eastern Time (Sydney)
Australia/Sydney

# (GMT+11:00) Noumea, New Caledonia
Pacific/Noumea

# (GMT+11:00) Norfolk Island (Austl.)
Pacific/Norfolk

# (GMT+12:00) Tarawa
Pacific/Tarawa

# (GMT+12:00) New Zealand Time
Pacific/Auckland