World Time Zones
Explanation, History and
Their use In Astrology
Time Conversions from/to GMT|UT
What is GMT ?
GMT is an abbreviation for Greenwich Meantime
GMT is the time zone from which all other time zones are measured against. Other time zones will be either ahead (+) or behind (-) Greenwich Meantime.
So if you live to the East of Greenwich, then the sun rises earlier and you get your noon before Greenwich does. If you live to the West of Greenwich, then you get your noon later than Greenwich. Therefore, Greenwich Mean Time (GMT) is later for those in the West and earlier for those in the East.
For example, Paris is GMT +1 hours. This means that when it is 12 noon in Greenwich, England, it is 1 PM in Paris. Los Angeles is GMT -8 hours. So when it is 12 noon in Greenwich (London), it is 4 AM in Los Angeles.
Greenwich Meantime is also known as Greenwich Meridian Line as Greenwich Meantime is measured against the line at the Royal Observatory in Greenwich (London).
Greenwich Meantime is 0º longitude which is an imaginary line that goes from the North Pole to the South Pole.
GMT is also known as UTC which is the abbreviation of Coordinated Universal Time. However, GMT is no longer the basis for civil time but is now loosely interchanged with UTC to refer to time kept on the Greenwich meridian (longitude zero).
Rules for determining the GMT (UT - Universal Time) of birth (East and West)
Since each time zone is theoretically 15 degrees wide, civil time changes by one hour forward and backward respectively for every 15 degrees east or west of the Greenwich Meridian. So GMT or UT is derived by adding the Time Zone if the birth was West of Greenwich, or by subtracting the time zone if the birth was East of Greenwich. To find the appropriate time zone in hours, the longitude (in degrees) is divided by 15. For example:
If the longitude of a place is 60 degrees east (or 60° E), the time would be 60 degrees divided by 15 degrees = 4 hours ahead of UTC/GMT (or UTC+4).
If the longitude of a place is 105 degrees west (or 105° W), the time would be 105 degrees divided by 15 degrees = 7 hours behind UTC (UTC/GMT) (or UTC-7).
Note : You also need to subtract any summer time (daylight saving time).
Study these examples:
(a) Eastern Birth
Suppose a person was born in Amritsar, India on 1st April 2009 at 1 pm (13.00). The longitude is 74E56 and the time zone is 5.5. Daylight saving is not observed in India. The birth occurred in the East, so we subtract the time zone. The UT was:
13 hours - 5.30 hours = 7.30 hours (am)
So GMT or Universal Time was 7.30 am.
(b) Western Birth (Change in Day of Birth)
Suppose a person was born in New York, USA on 29 June 1991 at 20:10. The latitude is 40N44 and the longitude is 74W00. The time zone is 5 and daylight saving was in operation. Since the birth is in the West, the time zone is added. Taking into account summer saving the UT of birth is:
20 hours 10 minutes + 5 (Time Zone) - 1 (Daylight Saving) = 24 hours 10 minutes
Because the time is greater than 24, we subtract 24 and add one to the day. So the UT birth time is:
0:10 am on 30 June, 1991
So the UT at Greenwich is 10 minutes past midnight on 30 June 1991, which is the day after!
It is important that when the day of birth changes, we use the new date to calculate or find the sidereal time in the ephemeris and positions of the planets.
In short, Time Zones Conversion steps or rules are:
1. Convert the UT/GMT time to your locality : If you are west of Greenwich, England you must subtract from UT/GMT. If you are east of Greenwich, England you must add. Or conversely, convert the local time to GMT. GMT or UT is derived by adding the Time Zone if the time (birth) was West of Greenwich, or by subtracting the time zone if the birth was East of Greenwich.
2. Convert to AM or PM : If UT/GMT is higher than 1200, it is PM. If the time is lower than 1200 it is AM.
3. Adjust for Daylight Savings Time : When summer time is in force, you need to subtract one hour (in some cases 1/2 hour or 2 hours) from the birth time.
4. Adjust the day : There are times when the day will change. Study the examples given above.
Time Zones applicable and used in various countries of the world are given below:
Country Time Zone
------- ---------
Afghanistan: 4.5 hours(East)
Albania: 1 hours (East)
Algeria: 1 hours (East)
American Samoa: 11 hours (West)
Andorra: 1 hours (East)
Angola: 1 hours (East)
Anguilla: 4 hours (West)
Antarctica: 2 hours (West)
Antigua: 4 hours (West)
Argentina: 3 hours (West)
Argentina western prov: 4 hours (West)
Armenia: 4 hours (East)
Aruba: 4 hours (West)
Ascension: 0 hours (West)
Australia Western: 8 hours (East)
Australia South: 9.5 hours (East)
Australia Northern Territory: 9.5 hours (East)
Australia New South Wales: 10 hours (East)
Australia Queensland: 10 hours (East)
Australia Victoria: 10 hours (East)
Australian Capital Territory: 10 hours (East)
Australia Tasmania: 10 hours (East)
Australia Lord Howe Island: 10.5 hours (East)
Austria: 1 hours (East)
Azerbaijan: 3 hours (East)
Azores: 1 hours (West)
Bahamas: 5 hours (West)
Bahrain: 3 hours (East)
Balearic Islands: 1 hours (East)
Bangladesh: 6 hours (East)
Barbados: 4 hours (West)
Belarus: 2 hours (East)
Belgium: 1 hours (East)
Belize: 6 hours (West)
Benin: 1 hours (East)
Bermuda: 4 hours (West)
Bhutan: 6 hours (East)
Bolivia: 4 hours (West)
Bonaire: 4 hours (West)
Bosnia Hercegovina: 1 hours (East)
Botswana: 2 hours (East)
Brazil West: 4 hours (West)
Brazil Acre: 4 hours (West)
Brazil East: 3 hours (West)
Brazil Atlantic Islands: 1 hours (West)
British Virgin Islands: 4 hours (West)
Brunei: 8 hours (East)
Bulgaria: 2 hours (East)
Burkina Faso: 0 hours (West)
Burundi: 2 hours (East)
Cambodia: 7 hours (East)
Cameroon: 1 hours (East)
Canada Yukon & Pacific: 8 hours (West)
Canada Mountain: 7 hours (West)
Canada Central: 6 hours (West)
Canada Eastern: 5 hours (West)
Canada Atlantic: 4 hours (West)
Canada Newfoundland: 3.5 hours (West)
Canary Islands: 0 hours (West)
Canton Enderbury Islands: 11 hours (West)
Cape Verde: 1 hours (West)
Caroline Island: 11 hours (East)
Cayman Islands: 5 hours (West)
Central African Rep: 1 hours (East)
Chad: 1 hours (East)
Channel Islands: 0 hours (West)
Chile: 4 hours (West)
China People's Rep: 8 hours (East)
Christmas Islands: 10 hours (West)
Colombia: 5 hours (West)
Congo: 1 hours (East)
Cook Islands: 10 hours (West)
Costa Rica: 6 hours (West)
Cote d'Ivoire: 0 hours (West)
Croatia: 1 hours (East)
Cuba: 5 hours (West)
Curacao: 4 hours (West)
Cyprus: 2 hours (East)
Czech Republic: 1 hours (East)
Dahomey: 1 hours (East)
Denmark: 1 hours (East)
Djibouti: 3 hours (East)
Dominica: 4 hours (West)
Dominican Republic: 4 hours (West)
Easter Island: 6 hours (West)
Ecuador: 5 hours (West)
Egypt: 2 hours (East)
El Salvador: 6 hours (West)
England: 0 hours (West)
Equatorial Guinea: 1 hours (East)
Eritrea: 3 hours (East)
Estonia: 2 hours (East)
Ethiopia: 3 hours (East)
Falkland Islands: 4 hours (West)
Faroe Island: 0 hours (West)
Fiji: 12 hours (East)
Finland: 2 hours (East)
France: 1 hours (East)
French Guiana: 3 hours (West)
French Polynesia: 10 hours (West)
Gabon: 1 hours (East)
Galapagos Islands: 5 hours (West)
Gambia: 0 hours (West)
Gambier Island: 9 hours (West)
Georgia: 4 hours (East)
Germany: 1 hours (East)
Ghana: 0 hours (West)
Gibraltar: 1 hours (East)
Greece: 2 hours (East)
Greenland: 3 hours (West)
Greenland Thule: 4 hours (West)
Greenland Scoresbysun: 1 hours (West)
Grenada: 4 hours (West)
Grenadines: 4 hours (West)
Guadeloupe: 4 hours (West)
Guam: 10 hours (East)
Guatemala: 6 hours (West)
Guinea: 0 hours (West)
Guinea Bissau: 1 hours (West)
Guyana: 3 hours (West)
Haiti: 5 hours (West)
Honduras: 6 hours (West)
Hong Kong: 8 hours (East)
Hungary: 1 hours (East)
Iceland: 0 hours (West)
India: 5.5 hours(East)
Indonesia West: 7 hours (East)
Indonesia Central: 8 hours (East)
Indonesia East: 9 hours (East)
Iran: 3.5 hours (East)
Iraq: 3 hours (East)
Ireland Republic of: 0 hours (West)
Israel: 2 hours (East)
Italy: 1 hours (East)
Jamaica: 5 hours (West)
Japan: 9 hours (East)
Johnston Island: 10 hours (West)
Jordan: 2 hours (East)
Kazakhstan: 6 hours (East)
Kenya: 3 hours (East)
Kiribati: 12 hours (East)
Korea Dem Republic of: 9 hours (East)
Korea Republic of: 9 hours (East)
Kusaie: 12 hours (East)
Kuwait: 3 hours (East)
Kwajalein: 12 hours (East)
Kyrgyzstan: 5 hours (East)
Laos: 7 hours (East)
Latvia: 2 hours (East)
Lebanon: 2 hours (East)
Leeward Islands: 4 hours (West)
Lesotho: 2 hours (East)
Liberia: 0 hours (West)
Libya: 2 hours (East)
Lithuania: 2 hours (East)
Luxembourg: 1 hours (East)
Macedonia: 1 hours (East)
Madagascar: 3 hours (East)
Madeira: 0 hours (West)
Malawi: 2 hours (East)
Malaysia: 8 hours (East)
Maldives: 5 hours (East)
Mali: 0 hours (West)
Mallorca Islands: 1 hours (East)
Malta: 1 hours (East)
Mariana Island: 10 hours (East)
Marquesas Islands: 9.5 hours (West)
Marshall Islands: 12 hours (East)
Martinique: 4 hours (West)
Mauritania: 0 hours (West)
Mauritius: 4 hours (East)
Mayotte: 3 hours (East)
Melilla: 1 hours (East)
Mexico: 6 hours (West)
Mexico Baja Calif Norte: 8 hours (West)
Mexico Nayarit: 7 hours (West)
Mexico Sinaloa: 7 hours (West)
Mexico Sonora: 7 hours (West)
Midway Island: 11 hours (West)
Moldova: 2 hours (East)
Moldovian Rep Pridnestrovye: 2 hours (East)
Monaco: 1 hours (East)
Mongolia: 8 hours (East)
Morocco: 0 hours (West)
Mozambique: 2 hours (East)
Myanmar: 6.5 hours (East)
Namibia: 1 hours (East)
Nauru Republic of: 12 hours (East)
Nepal: 5.75 hours (East)
Netherlands: 1 hours (East)
Netherlands Antilles: 4 hours (West)
Nevis Montserrat: 4 hours (West)
New Caledonia: 11 hours (East)
New Hebrides: 11 hours (East)
New Zealand: 12 hours (East)
Nicaragua: 6 hours (West)
Niger: 1 hours (East)
Nigeria: 1 hours (East)
Niue Island: 11 hours (West)
Norfolk Island: 11.5 hours (East)
Northern Ireland: 0 hours (West)
Northern Mariana Islands: 10 hours (East)
Norway: 1 hours (East)
Oman: 4 hours (East)
Pakistan: 5 hours (East)
Palau: 9 hours (East)
Panama: 5 hours (West)
Papua New Guinea: 10 hours (East)
Paraguay: 4 hours (West)
Peru: 5 hours (West)
Philippines: 8 hours (East)
Pingelap: 12 hours (East)
Poland: 1 hours (East)
Ponape Island: 11 hours (East)
Portugal: 1 hours (East)
Principe Island: 0 hours (West)
Puerto Rico: 4 hours (West)
Qatar: 3 hours (East)
Reunion: 4 hours (East)
Romania: 2 hours (East)
Russian Federation zone one: 2 hours (East)
Russian Federation zone two: 3 hours (East)
Russian Federation zone three: 4 hours (East)
Russian Federation zone four: 5 hours (East)
Russian Federation zone five: 6 hours (East)
Russian Federation zone six: 7 hours (East)
Russian Federation zone seven: 8 hours (East)
Russian Federation zone eight: 9 hours (East)
Russian Federation zone nine: 10 hours (East)
Russian Federation zone ten: 11 hours (East)
Russian Federation zone eleven: 12 hours (East)
Rwanda: 2 hours (East)
Saba: 4 hours (West)
Samoa: 11 hours (West)
San Marino: 1 hours (East)
Sao Tome e Principe: 0 hours (West)
Saudi Arabia: 3 hours (East)
Scotland: 0 hours (West)
Senegal: 0 hours (West)
Seychelles: 4 hours (East)
Sierra Leone: 0 hours (West)
Singapore: 8 hours (East)
Slovakia: 1 hours (East)
Slovenia: 1 hours (East)
Society Island: 10 hours (West)
Solomon Islands: 11 hours (East)
Somalia: 3 hours (East)
South Africa: 2 hours (East)
Spain: 1 hours (East)
Sri Lanka: 5.5 hours (East)
St Christopher: 4 hours (West)
St Croix: 4 hours (West)
St Helena: 0 hours (West)
St John: 4 hours (West)
St Kitts Nevis: 4 hours (West)
St Lucia: 4 hours (West)
St Maarten: 4 hours (West)
St Pierre & Miquelon: 3 hours (West)
St Thomas: 4 hours (West)
St Vincent: 4 hours (West)
Sudan: 2 hours (East)
Suriname: 3 hours (West)
Swaziland: 2 hours (East)
Sweden: 1 hours (East)
Switzerland: 1 hours (East)
Syria: 2 hours (East)
Tahiti: 10 hours (West)
Taiwan: 8 hours (East)
Tajikistan: 6 hours (East)
Tanzania: 3 hours (East)
Thailand: 7 hours (East)
Togo: 0 hours (West)
Tonga: 13 hours (East)
Trinidad and Tobago: 4 hours (West)
Tuamotu Island: 10 hours (West)
Tubuai Island: 10 hours (West)
Tunisia: 1 hours (East)
Turkey: 2 hours (East)
Turkmenistan: 5 hours (East)
Turks and Caicos Islands: 5 hours (West)
Tuvalu: 12 hours (East)
Uganda: 3 hours (East)
Ukraine: 2 hours (East)
United Arab Emirates: 4 hours (East)
United Kingdom: 0 hours (West)
USA Aleutian: 10 hours (West)
USA Hawaii: 10 hours (West)
USA Alaska: 9 hours (West)
USA Pacific: 8 hours (West)
USA Mountain: 7 hours (West)
USA Arizona: 7 hours (West)
USA Central: 6 hours (West)
USA Eastern: 5 hours (West)
USA Indiana East: 5 hours (West)
Uruguay: 3 hours (West)
Uzbekistan: 5 hours (East)
Vanuatu: 11 hours (East)
Vatican City: 1 hours (East)
Venezuela: 4 hours (West)
Vietnam: 7 hours (East)
Virgin Islands: 4 hours (West)
Wake Island: 12 hours (East)
Wales: 0 hours (West)
Wallis and Futuna Islands: 12 hours (East)
Windward Islands: 4 hours (West)
Yemen: 3 hours (East)
Yugoslavia: 1 hours (East)
Zaire Kinshasa Mbandaka: 1 hours (East)
Zaire Kasai: 2 hours (East)
Zaire Haut Zaire: 2 hours (East)
Zaire Kivu: 2 hours (East)
Zaire Shaba: 2 hours (East)
Zambia: 2 hours (East)
Zimbabwe: 2 hours (East)
Europe - Standard Time Zones
There are three different time zones across the EU:
1. Western Europe Time (Standard Time = GMT)
(United Kingdom, Ireland, Portugal)
2. Central Europe Time (Standard Time = GMT + 1)
(Austria, Belgium, Czech Republic, Germany, Denmark, Spain, France, Hungary, Italy, Luxembourg, Malta, The Netherlands, Poland, Slovakia, Slovenia, Sweden, (Non-EU:) Norway, Switzerland)
3. Eastern Europe Time (Standard Time = GMT + 2)
(Cyprus, Estonia, Finland, Greece, Latvia, Lithuania, Bulgaria, Romania,
(Non-EU:) Belarus, Moldova, Turkey, Ukraine)
USA Time Zones
The United States has six time zones. It shares four time zones with Canada viz. Eastern Time, Central Time, Mountain Time and Pacific Time.
Hawaii Time and Alaska Time are separate Time zones.
USA - Eastern EST/EDT
EST -5 hours
EDT -4 hours
USA - Central
CST -6 hours
CDT -5 hours
USA - Mountain
MST -7 hours
MDT -8 hours
USA - Pacific
PST -8 hours
PDT -7 hours
USA - Alaska Yukon
AKST -9 hours
AKDT -8 hours
USA - Hawaii
AHST -10 hours
Standard Time Zone Description
Abbreviation (+ or - GMT) ( Name )
-----------------------------------------------
GMT 0 Greenwich Mean
WAT 1 West African
AZT 2 Azores
BZT 3 Brazil (zone 2)
AST 4 Atlantic
EST 5 Eastern
CST 6 Central
MST 7 Mountain
PST 8 Pacific
YST 9 Yukon
AHT 10 Alaska-Hawaii
NAT 11 Nome, Alaska
NZT -12 New Zealand
Z11 -11 Zone11(USSR zone10)
GST -10 Guam
JST -9 Japan
CCT -8 China Coast
SST -7 Southern Sumatra
R5T -6 Russion Zone 5
R4T -5 Russion Zone 4
R3T -4 Russion Zone 3
BGT -3 Baghdad
EET -2 Eastern European
CET -1 Central European
NFT 3.5 Newfoundland
HST 10.5 Hawaiian Standard
KET -2.5 Kenya
IRT -3.5 Iran
IST -5.5 India Standard Time
NST -6.5 North Sumatra
SAT -9.5 South Australia
OZT -11.5 Old New Zealand
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