Time belt

map of the world with time belts
map of the world with day night border

a time belt is a section of the earth's surface, on which a common time applies. It runs ideal-proves between the degrees of longitude of Poland out. One knows Poland after the logic no different time beltsassign. To it the coordinated world time ( UTC) applies.

Actually the term time belt can have a multiple meaning depending upon view.

  1. The range with common time.
  2. The time difference to UTC (GMT)
  3. the designated time belt as combination of 1. and 2. , forthe range and the difference is clear.

Countries arrange ranges often a time belt (time differences), separate from spring center to autumn center, too (summer time). Z. B. Central Europe has normally (designated) the time belt MEZ (UTC+1) starting from October. In March becomes on thoseCentral European Summer Time (UTC+2) back changed.

Table of contents


original had each largerPlace over its own time, which was synchronized to a certain extent after the sun. If the sun achieved its highest point over the Horizot and in the south stood, it was 12 o'clock at noon.
One travels with the finger on the map Direction the east, then one progresses in the time, toward the west against it turns back one the time.

However a border is set to this time journey, the date border in such a way specified. If one exceeds it direction the east, one wins one dayin addition, toward the west one loses one day.

With the arising of the railways and the introduction of timetables the old time system proved as too complicated, since constant time conversions in the timetables had to be considered.

Time belts became first 1879 ofCanadian railway engineer Sir sand Ford Fleming (1827-1915) suggested as a railway time. This led after some preparing international conferences on the international Meridiankonferenz in October 1884 in Washington, D.C.to the fact that the earth was divided first in 24 hour zones by 15 degrees of longitude each.The difference between each zone amounted to thereby 60 minutes or one hour and thus 23 hours maximally to that backwards in each case seen first time belt. On this conference one agreed on the 1883 for the computation of the world time determined Greenwich- Meridian as Nullmeridian.

Purely mathematically regarded each time belt re-paints over thus a strip of 15 degrees of longitude on the earth's surface.

today the times

are coupled the today's situation in the different time belts to the coordinated world time (UTC), thosethus the function of the “Greenwich Mean Time” (GMT) took over. Exactly like the latters also the UTC is aligned after the zeroth degree of longitude, these runs by Greenwich/London. The times in the other time belts arise as a result of adding or taking one off (mostly)integral number of hours, depending upon their (middle) distance from the zeroth degree of longitude.

A time belt was assigned to each country. Countries with very large east west expansion have several time belts. Like that for example Russia is distributed over eleven time belts, the USA over six, Canada over five, Brazil over four, Australia and Mexico over three time belts. China however has one time belt despite its large east west expansion only.

However there are also countries or regions, which have further their specific times, their difference to other time belts nonefull hours amount to. Thus for example Iran three and a half hours, Afghanistan lie four and one-half hours, India five one half hours, and the Australian Federal States „Northern Territory “and „South Australia “nine one half hours before the coordinated world time. The reasons for these special cases are above allpolitical-historical nature.

versus time in addition,

nowadays the time belts have politics more political meaning than the sense of the indication of the exact time of day. Within the European union most countries belong the Central European time (MEZ),the one hour before the coordinated world time lies.Portugal, the united kingdom and the Republic of Ireland use UTC, Finland, Estonia, Lettland, Litauen, Greece and Cyprus use the Eastern European time (+2h opposite UTC). In some countriesthere were again and again attempts to attach it to the Central European time belt.

This preference for the Central European time states in addition that on east Norway pre-aged islands (Vardø) the sun already stands around 10:53 clock at the highest point,the northwestSpanish coast (cape Finisterre) against it only around 13:37 clock MEZ, during the summer time one hour later. Portugal gave the MEZ up again, since the children themselves had to go in the summer still with darkness to the school.

In the People's Republic of China - whose territory about five time belts (UTC+5h to UTC+9h) would overlap - only one time (UTC+8h) is used, which the coordinated world time eight hours ahead is. Decisive for this definition at that time the time was inPeking. In the westernmost Zipfel of China thus astronomical noon is only around 15:00 clock, in the east around 11:00 clock.

And in the Russian Exklave Kaliningrad it was long after the turn some years one hour later than in eastern (!)adjacent Lithuania and two hours later than in Poland bordering south - relevant the westernmost time belt was in the Russian motherland, thus +3h opposite UTC for Kaliningrad. Today the Exklave took over the Eastern European time belt (UTC+2h).

For commercial reasons applies in Singapore the same time as Hong Kong, so that the stock exchanges of the two cities open at the same time and close. Thus the sun up and - take place fall around 07:00 clock and 19:00 clock, contrary to the astronomical time (Singapore lies only1° north the equator) of 06:00 clock and 18:00 clock. Also Malaysia uses the same time belt as Singapore and Hong Kong.

In Nepal the Zeitverschiebung amounts to +5: opposite 45h the UTC, thus itself the small country of the large neighbour India wantsdefine, the +5: 30h has.

In Cuba 2004 were decided due to a substantial energy crisis to remain in the summer time. Thus Cuba has now all year round UTC-4, instead of the before valid, and geographically correct UTC-5. Thus the same phenomena result, howabove for Singapore described.

summer time

many countries change back in the spring center into another time belt, in the autumn again. Thus for instance the MEZ (UTC +1) applies, in the summer months however in the Central European European Union states in the winterthe Central European summer time (Central European Summer Time, UTC +2). If countries use the summer time on the Southern Hemisphere, it must be paid attention naturally to the fact that their seasons the European are opposite.

list of the time belts (selection)

regions with a star (*)use the summer time. Note: The list is still incomplete. For the abbreviations there is no world-wide obligatory definition, apart from UTC+/rear spar: mm. Thus one finds z. B. for the abbreviation “ECT” European cent ral Time (UTC+1), Ecuador Time (UTC-5) and EasternCaribbean Time (UTC-4).

UTC-12 to UTC-9: 30

UTC-12 UTC-11 UTC-10 UTC-9: 30
name: IDLW -
Internationally DATE LINE west
Alaska Hawaii standard Time

summer time:

Hawaii Daylight Time, UTC-9

of countries:

UTC-9 to UTC-6



Alaska standard Time
Yukon standard Time
Pacific standard Time
Mountain standard Time
Cent ral standard Time

summer time:

Alaska Daylight Time
Yukon Daylight Time, UTC-8
Pacific Daylight Time, UTC-7
Mountain Daylight Time, UTC-6
cent ral Daylight Time, UTC-5

of countries:

UTC-5 to UTC-4



Eastern standard Time
Atlantic standard Time

summer time:

Eastern Daylight Time, UTC-4
Atlantic Daylight Time, UTC-3

of countries:

UTC-3: 30 to UTC-1

UTC-3: 30 UTC-3 UTC-2 UTC-1


MC -
Newfoundland standard Time

summer time:

Newfoundland Daylight Time, UTC-2: 30


UTC to UTC+3



West European Time,
Greenwich Mean Time
German: WEZ -
Western European time
also Z-time (mil.) Zulu time
also: UTC
Cent ral European Time
German: MEZ -
Central European time
East European Time
German: Eastern European time
Moscow Time
BT -
Baghdad Time

Summer time:

Western European summer time,
west European buzzers Time/Daylight Time,
British buzzer Time, UTC+1
Central European Summer Time -
Central European summer time,
cent ral European buzzer Time/Daylight Time, UTC+2
East European buzzer Time/Daylight Time, UTC+3
Moscow Daylight Time, UTC+4

of countries:

UTC+3: 30 to UTC+5

UTC+3: 30 UTC+4 UTC+4: 30 UTC+5


Iran Time

summer time:

Iran buzzer Time, UTC+4: 30


UTC+5: 30 to UTC+6: 30

UTC+5: 30 UTC+5: 45 UTC+6 UTC+6: 30


Indian standard Time

summer time:


UTC+7 to UTC+9

UTC+7 UTC+8 UTC+8: 45 UTC+9


Indochina Time
China standard Time
Japan standard Time

summer time:


UTC+9: 30 to UTC+11

UTC+9: 30 UTC+10 UTC+10: 30 UTC+11


Australian cent ral standard Time
Australian Eastern standard Time

summer time:

Australian cent ral Daylight Time, UTC+10: 30
Australian Eastern Daylight Time, UTC+11


UTC+11: 30 to UTC+14

UTC+11: 30 UTC+12 UTC+12: 45 UTC+13/UTC+14


Norfolk (Iceland) Time
international DATE LINE East,
new one Zealand standard Time

summer time:

New Zealand Daylight Time, UTC+13

of countries:



see also

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