I wonder how many countries change their clocks routinely ? I have no idea
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Hehe, what can't you find on the internet
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Equatorial and tropical countries (lower latitudes) generally do not observe Daylight Saving Time. Since the daylight hours are similar during every season, there is no advantage to moving clocks forward during the summer. China has had a single time zone since May 1, 1980, observing summer Daylight Saving Time from 1986 through 1991; they do not observe DST now.
List of countries
Most countries that observe Daylight Saving Time are listed in the table below. They all save one hour in the summer and change their clocks some time between midnight and 3:00 a.m.
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Continent Country Beginning and ending days
Africa Egypt Start: Last Thursday in April
End: Last Thursday in September
Namibia Start: First Sunday in September
End: First Sunday in April
Tunisia Start: Last Sunday in March
End: Last Sunday in October
Asia Most states of the former USSR. Start: Last Sunday in March
End: Last Sunday in October
Iraq Start: April 1
End: October 1
Israel (more info) Start: Last Friday before April 2
End: The Sunday between
Rosh Hashana and Yom Kippur
Jordan Start: Last Thursday of March
End: Last Friday in September
Lebanon, Kyrgyzstan Start: Last Sunday in March
End: Last Sunday in October
Mongolia Start: Fourth Friday in March
End: Last Friday in September
Palestinian regions (more info) (Estimate)
Start: First Friday on or after 15 April
End: First Friday on or after 15 October
Syria Start: March 30
End: September 21
Australasia Australia - South Australia, Victoria,
Australian Capital Territory, New South Wales,
Lord Howe Island Start: Last Sunday in October
End: Last Sunday in March
Australia - Tasmania Start: First Sunday in October
End: Last Sunday in March
Fiji Stopped in 2000
New Zealand, Chatham - (read law) Start: First Sunday in October
End: Third Sunday in March
Tonga Start: First Sunday in November
End: Last Sunday in January
Europe European Union - (read law)
UK - (read law) Start: Last Sunday in March at 1 am UTC
End: Last Sunday in October at 1 am UTC
Russia Start: Last Sunday in March at 2 am local time
End: Last Sunday in October at 2 am local time
North America United States, Canada (excluding Saskatchewan and parts of Quebec, B.C., and Ontario), Mexico
St. Johns, Bahamas, Turks and Caicos Start: First Sunday in April
End: Last Sunday in October
U.S. and Canada beginning in 2007:
Start: Second Sunday in March
End: First Sunday in November
Cuba Start: April 1
End: Last Sunday in October
Greenland Same as EU
Guatemala Start: Last Sunday in April
End: First Sunday in October
Honduras Start: May 7
End: August
Mexico (except Sonora) Start: First Sunday in April
End: Last Sunday in October
Nicaragua Start: April
End: October (dates vary)
South America Brazil
(rules vary quite a bit from year to year).
Also, equatorial Brazil does not observe DST. Start: First Sunday in October
End: Third Sunday in February
Chile - (read law)
Start: Second Saturday of October - at midnight
End: Second Saturday of March - at midnight
Falklands Start: First Sunday on or after 8 September
End: First Sunday on or after 6 April
Paraguay Start: Third Sunday in October
End: Second Sunday in March
Antarctica Antarctica (more info) (varies, see below)