Most of us realize daylight savings time is not universal.
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 am.
Continent Country Beginning and ending days
Africa Egypt Start: Last Friday in April
End: Last Thursday in September
Namibia Start: First Sunday in September
End: First Sunday in April
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: April 1
End: The Saturday between
Rosh Hashana and Yom Kippur
Lebanon, Kirgizstan Start: Last Sunday in March
End: Last Sunday in October
Mongolia Stopped in 2002
Palestine (more info) (Estimate)
Start: First Friday on or after 15 April
End: First Friday on or after 15 October
Syria Start: April 1
End: October 1
Iran Start: the first day of Farvardin
End: the first day of Mehr
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, Mexico
St. Johns, Bahamas, Turks and Caicos Start: First Sunday in April
End: Last Sunday in October
Cuba Start: April 1
End: Last Sunday in October
Greenland Same as EU
South America Brazil
(rules vary quite a bit from year to year).
Also, equatorial Brazil does not observe DST. Start: First Sunday in November
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: First Sunday in September
End: First Sunday in April
Antarctica Antarctica (more info) (varies, see below)
Note that there are many oddities. For example, some parts of the US and Canada do not observe Daylight Saving Time, such as the state of Arizona (US) and the province Saskatchewan (Canada).
http://webexhibits.org/daylightsaving/g.html