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Time zone

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Time zones are areas of the Earth that follow the same definition of time. Formerly, people were using apparent solar time, resulting in the time differing slightly from town to town. Time zones partially rectified the problem by setting the clocks of a region to the same mean solar time. Time zones are generally centered on meridians of a longitude that is a multiple of 15º; however as the map below shows, the shapes of time zones can be quite irregular because of boundaries of countries.

All time zones are defined relative to Coordinated Universal Time (UTC), the time zone containing London.

See also: Sidereal time


A map of the world's time zones, Larger image

Table of contents
1.1 UTC-11
1.2 UTC-10 (HST - Hawaiian Standard Time)
1.3 UTC-9:30
1.4 UTC-9 (AKST - Alaska Standard Time)
1.5 UTC-8 (PST - Pacific Standard Time)
1.6 UTC-7 (MST - Mountain Standard Time)
1.7 UTC-6 (CST - Central Standard Time)
1.8 UTC-5 (EST - Eastern Standard Time)
1.9 UTC-4 (AST - Atlantic Standard Time)
1.10 UTC-3:30
1.11 UTC-3
1.12 UTC-2
1.13 UTC-1
1.14 UTC (WET - Western European Time, also called GMT)
1.15 UTC+1 (CET - Central European Time, also called MET - Middle European Time)
1.16 UTC+2 (EET - Eastern European Time)
1.17 UTC+3
1.18 UTC+3:30
1.19 UTC+4
1.20 UTC+4:30
1.21 UTC+5
1.22 UTC+5:30
1.23 UTC+5:45
1.24 UTC+6
1.25 UTC+6:30
1.26 UTC+7
1.27 UTC+8 (AWST - Australian Western Standard Time)
1.28 UTC+9
1.29 UTC+9:30 (ACST - Australian Central Standard Time)
1.30 UTC+10 (AEST - Australian Eastern Standard Time)
1.31 UTC+10:30
1.32 UTC+11
1.33 UTC+11:30
1.34 UTC+12
1.35 UTC+12:45
1.36 UTC+13
1.37 UTC+14

List of time zones and contained areas Countries with * observe Daylight Saving Time: add 1 in summer.

UTC-11

UTC-10 (HST - Hawaiian Standard Time)

UTC-9:30

UTC-9 (AKST - Alaska Standard Time)

UTC-8 (PST - Pacific Standard Time)

UTC-7 (MST - Mountain Standard Time)

UTC-6 (CST - Central Standard Time)

UTC-5 (EST - Eastern Standard Time)

UTC-4 (AST - Atlantic Standard Time)

UTC-3:30

UTC-3

UTC-2

UTC-1

UTC (WET - Western European Time, also called GMT)

UTC+1 (CET - Central European Time, also called MET - Middle European Time)

UTC+2 (EET - Eastern European Time)

UTC+3

UTC+3:30

UTC+4

UTC+4:30

UTC+5

UTC+5:30

UTC+5:45

UTC+6

UTC+6:30

UTC+7

UTC+8 (AWST - Australian Western Standard Time)

Note that the whole of China has the same time, which makes this time zone exceptionally wide. In the extreme west of China the sun is at its highest at 3 pm, in the extreme east at 11 am.

UTC+9

UTC+9:30 (ACST - Australian Central Standard Time)

UTC+10 (AEST - Australian Eastern Standard Time)

UTC+10:30

UTC+11

UTC+11:30

UTC+12

UTC+12:45

UTC+13

UTC+14

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