I wonder how many countries change their clocks routinely ?  I have no idea
Added In:
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)