Daylight Saving Time (DST) Rules — Summer Time Rules...

Daylight saving time (DST), also known as summer time in some locations, is the practice of moving clocks ahead usually, but not always, by 1 hour. Daylight saving time is most often implemented in the spring and ends in late autumn.

The benefit of daylight saving time is that by moving the clock ahead by 1 hour, sunset will happen later in the day thus creating more daylight for people to take advantage of. By having more daylight later in the day the theory is that less energy will be used for lighting, more people will go shopping after work because it is still daylight, people will have more recreation time later into the night and so on.

When daylight saving time ends and the clocks are moved back to the original time, the time is then referred to as Standard Time.

Most time zones have abbreviations. By looking at the abbreviation you can often tell if the time is based on standard time or daylight saving time. Example: PST stands for Pacific Standard Time while PDT stands for Pacific Daylight Time.

While the above rule is often accurate, like all good rules, there are exceptions. Since some regions prefer to use the term Summer Time, the S in the abbreviation can sometimes refer to Summer rather than Standard. Example: CET stands for Central Europe Time while CEST stands for Central Europe Summer Time.

To see a complete list of time zone abbreviations, please visit timegenie.com's comprehensive time zone abbreviations page.

Different regions around the world follow different rules as to when daylight saving time begins and ends. The rules are, for the most part, established well in advance but some countries start and end their daylight saving time with less than one week's notice.

There are numerous factors that can impact when daylight saving time begins and ends. Some of the factors are:

The latitude of location.
Religious holidays (Ramadan — Islamic countries ) or festivals (Carnival — Brazil).
Whether the location is in the northern (North America, Europe, etc) or southern (Australia, New Zealand, etc) hemisphere.
- For those that are not aware, when it is summer in the northern hemisphere , it's winter in the southern hemisphere and vice versa.

The chart below gives the starting and ending dates along with other information about daylight saving time rules for major regions around the world .

Region	Start Date	Start Time	Abbr	End Date	End Time	Abbr
Australia: Central	2009-10-04	02:00	ACDT	2010-04-04	02:00	ACST
Europe: Central	2009-03-29	02:00	CDT	2009-10-25	02:00	CET
Europe: Eastern	2009-03-29	02:00	EEST	2009-10-25	02:00	EET
Europe: Moscow	2009-03-29	02:00	MSD	2009-10-25	02:00	MSK
Europe: Western	2009-03-29	02:00	WEST	2009-10-25	02:00	WET
Mexico: Central	2009-04-05	02:00	CDT	2009-10-25	02:00	CST
Mexico: Mountain	2009-04-05	02:00	MDT	2009-10-25	02:00	MST
Mexico: Pacific	2009-04-05	02:00	PDT	2009-10-25	02:00	PST
North America: Alaska	2009-03-08	02:00	AKDT	2009-11-01	02:00	AKST
North America: Atlantic	2009-03-08	02:00	ADT	2009-11-01	02:00	AST
North America: Central	2009-03-08	02:00	CDT	2009-11-01	02:00	CST
North America: Eastern	2009-03-08	02:00	EDT	2009-11-01	02:00	EST
North America: Mountain	2009-03-08	02:00	MDT	2009-11-01	02:00	MST
North America: Newfoundland	2009-03-08	02:00	NDT	2009-11-01	02:00	NST
North America: Pacific	2009-03-08	02:00	PDT	2009-11-01	02:00	PST
South America: Argentina	2009-10-18	02:00	ARST	2010-03-21	02:00	ART
South America: Brazil	2009-10-18	00:00	BRST	2010-02-21	00:00	BRT
South America: Chile	2009-10-11	00:00	CLDT	2010-03-28	00:00	CLT
South Pacific: Australia Central	2009-10-04	02:00	ACDT	2010-04-04	02:00	ACST
South Pacific: Australia Eastern	2009-10-04	02:00	AEDT	2010-04-04	02:00	AEST
South Pacific: New Zealand	2009-09-27	02:00	NZDT	2010-04-04	02:00	NZST

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Current World Time...

You can change these times by setting your preferences. Additionally, Your Clock allows you to compare the time for up to 14 different cities around the world.

City	Time	GMT±
Vancouver	6:17 AM — Sat, Nov 7	-8:00
Perth	10:17 PM — Sat, Nov 7	+8:00
Nairobi	5:17 PM — Sat, Nov 7	+3:00
Vladivostok	12:17 AM — Sun, Nov 8	+10:00
Reykjavík	2:17 PM — Sat, Nov 7	+0:00

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