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Internet Accuracy Project

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World Time Zones

World Time Zones




Examples of U.S. time zone differences

Hawaii
Time
(HST)

Alaska
Time
(AKST)

Pacific
Time
(PST)

Mountain
Time
(MST)

Central
Time
(CST)

Eastern
Time
(EST)

10:00 a.m.
11:00 a.m.
12:00 p.m.
1:00 p.m.
2:00 p.m.
3:00 p.m.

The continental ("lower 48") United States is divided into four time zones - Pacific, Mountain, Central, and Eastern. Traveling from west to east, don't forget to set your watch ahead one hour for each time zone you cross. Traveling from east to west, set your watch back one hour for each time zone you cross.


You will find a detailed map of U.S. Time Zones and Area Codes here.



Daylight Saving Time

Setting your clock ahead one hour of standard time provides more daylight at the end of the day during late spring, summer, and early fall. Daylight Savings Time provides significant energy savings, more accessible daylight hours for those working outdoors, such as farmers, as well as a safer commute home for most workers.

Recently in the United States, daylight saving time had been observed from the first Sunday in April to the last Sunday in October, but starting in 2007, it will be observed from the second Sunday in March to the first Sunday in November, adding about a month to daylight saving time.

Most areas in Arizona, Hawaii and the U.S. territories of Puerto Rico, Virgin Islands, Guam, and American Samoa, do not observe DST, but instead stay on "standard time" all year long.

The rule to remember when setting your clocks is, spring forward one hour in the spring, and fall back one hour in autumn.

U.S. Daylight Saving Time Schedule

2007: March 11 - November 4 (set clocks back the night of the 3rd)
2008: March 9 - November 2 (set clocks back the night of the 1st)
2009: March 8 - November 1 (set clocks back the night of the 31th)
2010: March 14 - November 7 (set clocks back the night of the 6th)
2011: March 13 - November 6 (set clocks back the night of the 5th)
2012: March 11 - November 4 (set clocks back the night of the 3rd)




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