Daylight Saving Time Changes

DST Summary Worldwide 2011
DST Observance Count Example
No DST at all 168 China
At least one location observes DST 80 United States
All locations observe DST some part of the year 70 Iran
Many locations observe DST part of the year 10 United States
Daylight Saving Time for other years
Yearly Overview January–June July–December
2009 first half of 2009 second half of 2009
2010 first half of 2010 second half of 2010
2011 first half of 2011 second half of 2011
2012 first half of 2012 second half of 2012
2013 first half of 2013 second half of 2013

Other years

Daylight Saving Time – DST
  1. What Is Daylight Saving Time?
  2. One Hour Back or Forward?
  3. What Is Standard Time?
  4. Savings or Saving?
  5. Pros and Cons of DST
  6. Expert on DST
  7. Your Health and DST
  8. Is Summer Time the Same as DST?
  9. Winter Time or Standard Time?
  10. History of DST
  11. DST in the USA
  12. DST in Europe
  13. History of DST in Europe
  14. How Does DST Work?
  15. DST Statistics
  16. Circadian Rhythm: Your Body’s Master Clock
  17. Babies and DST
  18. Dealing with Daylight Saving Time Chaos

Time Zones & DST

Time Zone Library
  1. What Is a Time Zone?
  2. Why Do We Have Time Zones?
  3. How Are Time Zones Decided?
  4. How Many Time Zones Are There?
  5. Which Country Has the Most Time Zones?
  6. Half Hour & 45 Minute Time Zones
  7. What Is Standard Time?
  8. Your Clock and Solar Time
  9. What's the International Date Line?
  10. Time at the North Pole
  11. Time on Cruise Ships
  12. Jet Lag Tips
  13. Tips for Meetings across Time Zones

Time Zones Worldwide