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Time Zones Explained!
Table 1: Converting Between American and Military Time
| American | 12 Midnight | 1 AM | 2 AM | 3 AM | 4 AM | 5 AM | 6 AM | 7 AM | 8 AM | 9 AM | 10 AM | 11 AM | 12 noon | 1 PM | 2 PM | 3 PM | 4 PM | 5 PM | 6 PM | 7 PM | 8 PM | 9 PM | 10 PM | 11 PM | 12 Midnight |
| Military | 0000 | 0100 | 0200 | 0300 | 0400 | 0500 | 0600 | 0700 | 0800 | 0900 | 1000 | 1100 | 1200 | 1300 | 1400 | 1500 | 1600 | 1700 | 1800 | 1900 | 2000 | 2100 | 2200 | 2300 | 2400 |
The American system of telling time divides the day into two equal parts with twelve hours
in each.
The first half-12 Midnight through 12 Noon-is called AM (ante meridiem, before noon).
The second half-12 Noon through 12 Midnight-is called PM (post meridiem, after noon).
Niether AM nor PM should be used to denote either Midnight or Noon without ambiguity.
To denote Noon the word Noon should be used. To denote Midnight, the word Midnight
should be used.
This system is used primarily in the United States.
The Military system of telling time divides the day into 24 equal hours.
The hours 0000-1200 corespond to to the AM hours, and 1200-2400 corespond to PM.
1300 is referred to as "thirteen hundred hours", and 0100 hours is called "Zero one hundred hours."
To convert between systems, subtract 12 from military time if the hour is 1300 or greater; thus 1300 hours is 1 PM.
If the hour is less than 1200, it is the same; thus 0800 hours is 8 AM.
Both 0000 hours and 2400 hours refer to midnight.
This system is used in Europe, by scientific organizations, and by the military.
Table 2: Time Zones Around the World
| Date | April 30th | May 1st |
|---|
| American | 11 PM | 12 Midnight | 1 AM | 2 AM | 3 AM | 4 AM | 5 AM | 6 AM | 7 AM | 8 AM | 9 AM | 10 AM | 11 AM | 12noon | 1PM | 2 PM | 3 PM | 4 PM | 5 PM | 6 PM | 7 PM | 8 PM | 9 PM | 10 PM |
| Greenwhich Mean Time | +11 | +12/-12 Int'l Nat'l Date Line | -11 | -10 | -9 | -8 | -7 | -6 | -5 | -4 | -3 | -2 | -1 | 0 | +1 | +2 | +3 | +4:30 | +5:30 | +6 | +7 | +8 | +9 | +10:00 |
| City In Zone | Honiara | Aukland | Pago Pago, American Samoa | Honolulu | Juneau | Los Angeles | Denver | Chicago | New York | Halifax | Buenos Aires | Godthab, Greenland | Scoresbysund, Greenland | London | Berlin | Athens | Moscow | Kabul, Afghanistan | Bombay | Dhanka, Bangladesh | Sumatra, Indonesia | Beijing | Tokyo | Canberra, Australia |
| Time Zone Name | Soloman Islands | New Zealand | Samoa | Hawaii/Aleutian | Alaska | Pacific | Mountain | Central | Eastern | Atlantic | Eastern Andes | Greenland Central | Greenland Eastern | Greenwhich Mean | Middle Eupropean | | | | | | | | | Australian Eastern |
Standard time is determined from the Prime Meridian of Longitude in Greenwhich, England.
The world is divided into 24 zones, each fifteen degrees, or one hour apart.
The Greenwhich meridian (zero degrees) bisects the premiere zone.
Zones on the right (East) are numbered from 1 to 12, with a "minus" sign showing the number of hours to be subtracted to obtain Greenwhich Time.
The zones to the left (West) are similarly numbered, but with a "plus" showing the number of hours that must be added to obtain Greenwhich time.
The International Date line, which rests on the 180th meridian, separates calendar dates.
The date must be advanced one day when crossing in a westerly direction, and set back one day when crossing in an easterly direction.
The international date line deviates from the 180th meridian because of decisions made by nations affected.
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