Ar y dudalen hon, fe welwch yr holl gylchoedd amser a gefnogir gan PHP. Rhestrir parthau amser yn ôl eu rhanbarthau fel y gallwch ddod o hyd i'r un a ddymunir yn ôl y rhanbarth.
Affrica
| Affrica / Abidjan | Affrica / Accra | Affrica / Addis_Ababa | Affrica / Algiers | Africa / Asmara |
| Affrica / Asmera | Africa / Bamako | Affrica / Bangui | Affrica / Banjul | Affrica / Bissau |
| Affrica / Blantyre | Africa / Brazzaville | Affrica / Bujumbura | Affrica / Cairo | Affrica / Casablanca |
| Affrica / Ceuta | Affrica / Conakry | Africa / Dakar | Affrica / Dar_es_Salaam | Affrica / Djibouti |
| Affrica / Douala | Affrica / El_Aaiun | Affrica / Freetown | Affrica / Gaborone | Affrica / Harare |
| Affrica / Johannesburg | Affrica / Juba | Africa / Kampala | Affrica / Khartoum | Affrica / Kigali |
| Africa / Kinshasa | Affrica / Lagos | Africa / Libreville | Affrica / Lome | Affrica / Luanda |
| Affrica / Lubumbashi | Africa / Lusaka | Affrica / Malabo | Affrica / Maputo | Affrica / Maseru |
| Affrica / Mbabane | Affrica / Mogadishu | Affrica / Monrovia | Affrica / Nairobi | Africa / Ndjamena |
| Affrica / Niamey | Affrica / Nouakchott | Affrica / Ouagadougou | Affrica / Porto-Novo | Affrica / Sao_Tome |
| Affrica / Timbuktu | Affrica / Tripoli | Affrica / Tunis | Affrica / Windhoek |
America
| America / Adak | America / Anchorage | America / Anguilla |
| America / Antigua | America / Araguaina | America / Ariannin / Buenos_Aires |
| America / Yr Ariannin / Catamarca | America / Ariannin / ComodRivadavia | America / Yr Ariannin / Cordoba |
| America / Yr Ariannin / Jujuy | America / Ariannin / La_Rioja | America / Yr Ariannin / Mendoza |
| America / Ariannin / Rio_Gallegos | America / Yr Ariannin / Salta | America / Ariannin / San_Juan |
| America / Ariannin / San_Luis | America / Yr Ariannin / Tucuman | America / Yr Ariannin / Ushuaia |
| America / Aruba | America / Asuncion | America / Atikokan |
| America / Atka | America / Bahia | America / Bahia_Banderas |
| America / Barbados | America / Belem | America / Belize |
| America / Blanc-Sablon | America / Boa_Vista | America / Bogota |
| America / Boise | America / Buenos_Aires | America / Caergrawnt_Bay |
| America / Campo_Grande | America / Cancun | America / Caracas |
| America / Catamarca | America / Cayenne | America / Cayman |
| America / Chicago | America / Chihuahua | America / Coral_Harbour |
| America / Cordoba | America / Costa_Rica | America / Creston |
| America / Cuiaba | America / Curacao | America / Danmarkshavn |
| America / Dawson | America / Dawson_Creek | America / Denver |
| America / Detroit | America / Dominica | America / Edmonton |
| America / Eirunepe | America / El_Salvador | America / Ensenada |
| America / Fort_Wayne | America / Fortaleza | America / Glace_Bay |
| America / Godthab | America / Goose_Bay | America / Grand_Turk |
| America / Grenada | America / Guadeloupe | America / Guatemala |
| America / Guayaquil | America / Guyana | America / Halifax |
| America / Havana | America / Hermosillo | America / Indiana / Indianapolis |
| America / Indiana / Knox | America / Indiana / Marengo | America / Indiana / Petersburg |
| America / Indiana / Tell_City | America / Indiana / VEVAY | America / Indiana / Vincennes |
| America / Indiana / WINAMAC | America / Indianapolis | America / Inuvik |
| America / Iqaluit | America / Jamaica | America / Jujuy |
| America / Juneau | America / Kentucky / Louisville | America / Kentucky / Monticello |
| America / Knox_IN | America / Kralendijk | America / La_Paz |
| America / Lima | America / Los_Angeles | America / Louisville |
| America / Lower_Princes | America / Maceio | America / Managua |
| America / Manaus | America / Marigot | America / Martinique |
| America / Matamoros | America / Mazatlan | America / Mendoza |
| America / Menominee | America / Merida | America / METLAKATLA |
| America / Mexico_City | America / Miquelon | America / Moncton |
| America / Monterrey | America / Montevideo | America / Montreal |
| America / Montserrat | America / Nassau | America / New_York |
| America / Nipigon | America / Nome | America / Noronha |
| America / Gogledd_Dakota / Beulah | America / Gogledd_Dakota / Canolfan | America / North_Dakota / New_Salem |
| America / Ojinaga | America / Panama | America / Pangnirtung |
| America / Paramaribo | America / Phoenix | America / Port-au-Prince |
| America / Port_of_Spain | America / Porto_Acre | America / Porto_Velho |
| America / Puerto_Rico | America / Rainy_River | America / Rankin_Inlet |
| America / Recife | America / Regina | America / benderfynol |
| America / Rio_Branco | America / Rosario | America / Santa_Isabel |
| America / Santarem | America / Santiago | America / Santo_Domingo |
| America / Sao_Paulo | America / Scoresbysund | America / Shiprock |
| America / Sitka | America / St_Barthelemy | America / St_Johns |
| America / St_Kitts | America / St_Lucia | America / St_Thomas |
| America / St_Vincent | America / Swift_Current | America / Tegucigalpa |
| America / Thule | America / Thunder_Bay | America / Tijuana |
| America / Toronto | America / Tortola | America / Vancouver |
| America / Virgin | America / Whitehorse | America / Winnipeg |
| America / Yakutat | America / Yellowknife |
Antarctica
| Antarctica / Casey | Antarctica / Davis | Antarctica / DumontDUrville | Antarctica / Macquarie | Antarctica / Mawson |
| Antarctica / McMurdo | Antarctica / Palmer | Antarctica / Rothera | Antarctica / South_Pole | Antarctica / Syowa |
| Antarctica / Vostok |
Arctig
| Arctig / Longyearbyen |
asia
| Asia / Aden | Asia / Almaty | Asia / Amman | Asia / Anadyr | Asia / Aqtau |
| Asia / Aqtobe | Asia / Ashgabat | Asia / Ashkhabad | Asia / Baghdad | Asia / Bahrain |
| Asia / Baku | Asia / Bangkok | Asia / Beirut | Asia / Bishkek | Asia / Brunei |
| Asia / Calcutta | Asia / Choibalsan | Asia / Chongqing | Asia / Chungking | Asia / Colombo |
| Asia / Dacca | Asia / Damascus | Asia / Dhaka | Asia / Dili | Asia / Dubai |
| Asia / Dushanbe | Asia / Gaza | Asia / Harbin | Asia / Hebron | Asia / Ho_Chi_Minh |
| Asia / Hong_Kong | Asia / Hovd | Asia / Irkutsk | Asia / Istanbwl | Asia / Jakarta |
| Asia / Jayapura | Asia / Jerwsalem | Asia / Kabul | Asia / Kamchatka | Asia / Karachi |
| Asia / Kashgar | Asia / Kathmandu | Asia / Katmandu | Asia / Khandyga | Asia / Kolkata |
| Asia / Krasnoyarsk | Asia / Kuala_Lumpur | Asia / Kuching | Asia / Kuwait | Asia / Macao |
| Asia / Macau | Asia / Magadan | Asia / Makassar | Asia / Manila | Asia / Muscat |
| Asia / Nicosia | Asia / Novokuznetsk | Asia / Novosibirsk | Asia / Omsk | Asia / Llafar |
| Asia / Phnom_Penh | Asia / Pontianak | Asia / Pyongyang | Asia / Qatar | Asia / Qyzylorda |
| Asia / Rangoon | Asia / Riyadh | Asia / Saigon | Asia / Sakhalin | Asia / Samarkand |
| Asia / Seoul | Asia / Shanghai | Asia / Singapore | Asia / Taipei | Asia / Tashkent |
| Asia / Tbilisi | Asia / Tehran | Asia / Tel_Aviv | Asia / Thimbu | Asia / Thimphu |
| Asia / Tokyo | Asia / Ujung_Pandang | Asia / Ulaanbaatar | Asia / Ulan_Bator | Asia / Urumqi |
| Asia / Ust-Nera | Asia / Vientiane | Asia / Vladivostok | Asia / Yakutsk | Asia / Yekaterinburg |
| Asia / Yerevan |
Iwerydd
| Iwerydd / Azores | Iwerydd / Bermuda | Iwerydd / Canary | Iwerydd / Cape_Verde | Iwerydd / Faeroe |
| Iwerydd / Faroe | Iwerydd / Jan_Mayen | Iwerydd / Madeira | Iwerydd / Reykjavik | Iwerydd / De_Georgia |
| Iwerydd / St_Helena | Iwerydd / Stanley |
Awstralia
| Awstralia / ACT | Awstralia / Adelaide | Awstralia / Brisbane | Awstralia / Broken_Hill | Awstralia / Canberra |
| Awstralia / Currie | Awstralia / Darwin | Awstralia / Eucla | Awstralia / Hobart | Awstralia / LHI |
| Awstralia / Lindeman | Awstralia / Lord_Howe | Awstralia / Melbourne | Awstralia / Gogledd | Awstralia / NSW |
| Awstralia / Perth | Awstralia / Queensland | Awstralia / De | Awstralia / Sydney | Awstralia / Tasmania |
| Awstralia / Victoria | Awstralia / Gorllewin | Awstralia / Yancowinna |
Ewrop
| Ewrop / Amsterdam | Ewrop / Andorra | Ewrop / Athens | Ewrop / Belffast | Ewrop / Belgrade |
| Ewrop / Berlin | Ewrop / Bratislava | Ewrop / Brwsel | Ewrop / Bucharest | Ewrop / Bwdapest |
| Ewrop / Busingen | Ewrop / Chisinau | Ewrop / Copenhagen | Ewrop / Dulyn | Ewrop / Gibraltar |
| Ewrop / Guernsey | Ewrop / Helsinki | Ewrop / Ynys_of_Man | Ewrop / Istanbul | Ewrop / Jersey |
| Ewrop / Kaliningrad | Ewrop / Kiev | Ewrop / Lisbon | Ewrop / Ljubljana | Ewrop / Llundain |
| Ewrop / Luxembourg | Ewrop / Madrid | Ewrop / Malta | Ewrop / Mariehamn | Ewrop / Minsk |
| Ewrop / Monaco | Ewrop / Moscow | Ewrop / Nicosia | Ewrop / Oslo | Ewrop / Paris |
| Ewrop / Podgorica | Ewrop / Prague | Ewrop / Riga | Ewrop / Rhufain | Ewrop / Samara |
| Ewrop / San_Marino | Ewrop / Sarajevo | Ewrop / Simferopol | Ewrop / Skopje | Ewrop / Sofia |
| Ewrop / Stockholm | Ewrop / Tallinn | Ewrop / Tirane | Ewrop / Tiraspol | Ewrop / Uzhgorod |
| Ewrop / Vaduz | Ewrop / Fatican | Ewrop / Vienna | Ewrop / Vilnius | Ewrop / Volgograd |
| Ewrop / Warsaw | Ewrop / Zagreb | Ewrop / Zaporozhye | Ewrop / Zurich |
Indiaidd
| Indian / Antananarivo | Indian / Chagos | Indian / Nadolig | Indian / Cocos | Indian / Comoro |
| Indian / Kerguelen | Indian / Mahe | Indian / Maldives | Indian / Mauritius | Indian / Mayotte |
| Indian / Aduniad |
Môr Tawel
| Mor_ Tawel / Apia | Mor_ Tawel / Auckland | Mor_ Tawel / Chatham | Y Môr Tawel / Chuuk | Mor_ Tawel / Pasg |
| Mor_ Tawel / Efate | Mor_ Tawel / Enderbury | Y Môr Tawel / Fakaofo | Mor_ Tawel / Fiji | Y Môr Tawel / Funafuti |
| Mor_ Tawel / Galapagos | Mor_ Tawel / Gambier | Mor_ Tawel / Guadalcanal | Mor_ Tawel / Guam | Mor_ Tawel / Honolulu |
| Môr Tawel / Johnston | Y Môr Tawel / Kiritimati | Y Môr Tawel / Kosrae | Y Môr Tawel / Kwajalein | Mor_ Tawel / Majuro |
| Y Môr Tawel / Marquesas | Mor_ Tawel / Midway | Mor_ Tawel / Nauru | Mor_ Tawel / Niue | Mor_ Tawel / Norfolk |
| Mor_ Tawel / Noumea | Môr Tawel / Pago_Pago | Mor_ Tawel / Palau | Mor_ Tawel / Pitcairn | Y Môr Tawel / Pohnpei |
| Môr Tawel / Ponape | Môr Tawel / Port_Moresby | Mor_ Tawel / Rarotonga | Mor_ Tawel / Saipan | Môr Tawel / Samoa |
| Mor_ Tawel / Tahiti | Y Môr Tawel / Tarawa | Mor_ Tawel / Tongatapu | Môr Tawel / Tryc | Mor_ Tawel / Wake |
| Y Môr Tawel / Wallis | Môr Tawel / Yap |
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