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 / 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 / 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 / Casey Antarctica / Davis Antarctica / DumontDUrville Antarctica / Macquarie Antarctica / Mawson Antarctica / McMurdo Antarctica / Palmer Antarctica / Rothera Antarctica / South_Pole Antarctica / Syowa Antarctica / Vostok
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 / 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 / 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 / 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
Indian / Antananarivo Indian / Chagos Indian / Nadolig Indian / Cocos Indian / Comoro Indian / Kerguelen Indian / Mahe Indian / Maldives Indian / Mauritius Indian / Mayotte Indian / Aduniad
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
