- The what and why of daylight savings time and some timezone notes
- The current US schedule for when daylight savings time begins and ends
- Where is daylight savings time in the US and some timezone notes
- Dealing with changing all the clocks
- Daylight savings time around the world
Why Have and What Is Daylight Savings Time?This page is US-centric; but except for the start and end dates, it's pretty much all the same.
The purpose of Daylight Savings Time is to conserve energy. There is some dispute as to whether this objective is accomplished or not. The methodology used is to move one hour of sunlight from the morning to the evening by resetting the clocks.
The official abbreviation for Daylight Savings Time is DST (Standard Time being ST). So, for the east and west coast time zones for example, the designations change from EST and PST to EDT and PDT.
When Does Daylight Savings Time Start and End in 2017?
Daylight Saving Time Begins: Sunday, March 12, 2017, 2:00 am (dates updated yearly)To move one hour of sunlight from the morning to the evening, clocks are reset ahead one hour every spring. Currently this is done on the second Sunday of every March at 2:00 a.m. At the appointed time, the clocks are reset forward to 3:00 a.m. ("spring forward").
Daylight Saving Time Ends: Sunday, November 5, 2017, 2:00 am (dates updated yearly)To make things as they were and move that extra sunlight hour back to the morning, clocks are reset back one hour every fall. Currently this is done the first Sunday of every November at 2:00 a.m. At the appointed time, the clocks are reset from 2:00 a.m. back to 1:00 a.m. ("fall back"). Generally, folks aren't amused when this happens; they have become used to not having to commute home in the dark every evening.
Where Is Daylight Savings Time? East and West Coast. More.Not all of the US engages in this adventure. Both Hawaii and most of Arizona decided they wanted nothing to do with it. Most US territories also do not observe Daylight Savings Time. These entities remain on Standard Time year-round.
The Clock-Changing Reality...
|Yb (Ytterbium) Lattice Atomic Clock (NIST)|
What one is "supposed" to do is reset all the clocks before going to bed. However, more often than not, this usually does not happen. The clocks generally get reset Sunday throughout the day, usually because there are so many of them. Personally, I start doing the resetting beginning mid Saturday morning. By the time I go to bed, I've pretty much already adjusted to the time change.
The various computer and computer-related clocks are invariably checked to see if they were indeed coordinated enough to do what they are supposed to do.
If you are looking to reset everything accurately right down to the precise second, you can do so at www.time.gov. Daylight Savings Time changes are also supposed to be the bi-annual reminder to check and/or change your smoke and carbon monoxide detectors and batteries.
Daylight Saving Time Around the World
DST World Overview List
- Canada is as the US; most provinces and territories take it, some leave it. Mexico is the same.
- Central and South America mostly want nothing to do with Daylight Savings Time; however, Chile and parts of Brazil do indeed do DST.
- Europe mostly does do Daylight Savings Time. Russia, China, and all of Asia want absolutely nothing to do with it.
- Australia is as the US, Canada and Mexico; majority do, but some don't.
- Africa is 90% don't do DST and 10% do do DST.
Non US daylight savings time start and end dates can usually be found at www.timeanddate.com.
World Time Zone Non Standard AbbreviationsThere sure are a lot of them... Not only that, many of the abbreviations are not unique. The whole thing is a complete, non-standardized mess. The reason is each country makes up their own, locally relevant designations. The timeanddate website appears to have the best compilation of the non-standardized world time zone abbreviations currently being used.
There is also a World Standardized Time Zone and and a World Standardized Time Code
- GMT (0/-/+) is the time zone abbreviation for Greenwich Mean Time. Many other time zones will refer to themselves as GMT, plus or minus the number of hours difference between their timezone and the GMT timezone.
- UTC (0/-/+) is the time code abbreviation for Coordinated Universal Time or Universal Coordinated Time. This is the military and civilian standard mostly used these days.
UTC / GMT Map
Note that each timezone also has its own letter designation.
Random List of Examples (during non daylight saving times):
- 0 London; Paris
- -5 New York; Quebec; US East Coast. (-4 during DST)
- -6 Winnipeg; Dallas
- -7 Denver; Edmonton
- -8 Los Angeles; San Francisco; US West Coast (-7 during DST)
- -10 Honolulu
- +1 Berlin
- +3 Moscow
- +8 Shanghai; Perth
- +9 Tokyo
- +10 Sydney