Uhrzeit Tokyo, Japan - Zeitverschiebung, Zeitumstellung, Lokalzeit Tokyo, Sommerzeit , Zeitunterschied, Weltzeituhr. Reiseinformationen zu Japan. Japan befindet sich in der Zeitzone Japan Standard Time (JST). nach Reisezeit. Aktuelle Uhrzeit in Tokio (Japan). 16 am. Aktuelles Datum, 8. Dezember Aktuelle Uhrzeit, Sonnenaufgang heute, Sonnenuntergang heute, Zeitzone, UTC+9. Tageslänge, 09h.
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Apparent and mean solar time can differ by up to around 15 minutes as described by the equation of time because of the elliptical shape of the Earth's orbit around the Sun eccentricity and the tilt of the Earth's axis obliquity.
Mean solar time has days of equal length, and the accumulated difference between the two sums to zero after a year.
Greenwich Mean Time GMT was established in , when the Royal Observatory was built, as an aid to mariners to determine longitude at sea, providing a standard reference time while each city in England kept a different local time.
Local solar time became increasingly inconvenient as rail transport and telecommunications improved, because clocks differed between places by amounts corresponding to the differences in their geographical longitudes, which varied by four minutes of time for every degree of longitude.
For example, Bristol , England is about 2. The first adoption of a standard time was in November , in Great Britain by railway companies using GMT kept by portable chronometers.
This quickly became known as Railway Time. About August 23, , time signals were first transmitted by telegraph from the Royal Observatory, Greenwich.
Some British clocks from this period have two minute hands—one for the local time, one for GMT.
Improvements in worldwide communication further increased the need for interacting parties to communicate mutually comprehensible time references to one another.
The problem of differing local times could be solved across larger areas by synchronizing clocks worldwide, but in many places that adopted time would then differ markedly from the solar time to which people were accustomed.
On November 2, , the then British colony of New Zealand officially adopted a standard time to be observed throughout the colony, and was the first country to do so.
This standard was known as New Zealand Mean Time. Timekeeping on the American railroads in the midth century was somewhat confused. Each railroad used its own standard time, usually based on the local time of its headquarters or most important terminus, and the railroad's train schedules were published using its own time.
Some junctions served by several railroads had a clock for each railroad, each showing a different time. Charles F. Dowd proposed a system of one-hour standard time zones for American railroads about , although he published nothing on the matter at that time and did not consult railroad officials until In he proposed four ideal time zones having north—south borders , the first centered on Washington, D.
Dowd's system was never accepted by American railroads. Instead, U. Allen, the editor of the Traveler's Official Railway Guide.
For example, the border between its Eastern and Central time zones ran through Detroit , Buffalo , Pittsburgh , Atlanta , and Charleston. It was inaugurated on Sunday, November 18, , also called "The Day of Two Noons",  when each railroad station clock was reset as standard-time noon was reached within each time zone.
The confusion of times came to an end when Standard zone time was formally adopted by the U. Congress in the Standard Time Act of March 19, The first known person to conceive of a worldwide system of time zones was the Italian mathematician Quirico Filopanti.
He introduced the idea in his book Miranda! He proposed 24 hourly time zones, which he called "longitudinal days", the first centred on the meridian of Rome.
He also proposed a universal time to be used in astronomy and telegraphy. But his book attracted no attention until long after his death. Scottish-born Canadian Sir Sandford Fleming proposed a worldwide system of time zones in He advocated his system at several international conferences, and is credited with "the initial effort that led to the adoption of the present time meridians".
In he specified that his universal day would begin at the anti-meridian of Greenwich th meridian , while conceding that hourly time zones might have some limited local use.
He also proposed his system at the International Meridian Conference in October , but it did not adopt his time zones because they were not within its purview.
The conference did adopt a universal day of 24 hours beginning at Greenwich midnight, but specified that it "shall not interfere with the use of local or standard time where desirable".
By about , almost all inhabited places on Earth had adopted one or other standard time zone; but only some of these used an hourly offset from GMT.
Many applied the time at a local astronomical observatory to an entire country, without any reference to GMT. By , the majority of countries had adopted hourly time zones, though a number of countries from Iran to Australia had time zones with a minute offset.
Today, all nations use standard time zones for secular purposes, but they do not all apply the concept as originally conceived. Newfoundland , India, Iran, Afghanistan, Myanmar, Sri Lanka, the Marquesas , as well as parts of Australia use half-hour deviations from standard time, and some nations, such as Nepal, and some provinces, such as the Chatham Islands of New Zealand, use quarter-hour deviations.
ISO is an international standard that defines methods of representing dates and times in textual form, including specifications for representing time zones.
UTC time is also known as "Zulu" time, since "Zulu" is a phonetic alphabet code word for the letter "Z".
This numeric representation of time zones is appended to local times in the same way that alphabetic time zone abbreviations or "Z", as above are appended.
The offset from UTC changes with daylight saving time , e. Time zones are often represented by alphabetic abbreviations such as "EST", "WST", and "CST", but these are not part of the international time and date standard ISO and their use as sole designator for a time zone is discouraged.
These examples give the local time at various locations around the world when daylight saving time is not in effect:.
Where the adjustment for time zones results in a time at the other side of midnight from UTC, then the date at the location is one day later or earlier.
The time-zone adjustment for a specific location may vary because of daylight saving time. The more familiar term "UTC offset" is used here rather than the term "zone designator" used by the standard.
These calculations become more complicated near a daylight saving boundary because the UTC offset for zone X is a function of the UTC time.
Since the s a nautical standard time system has been in operation for ships on the high seas. Nautical time zones are an ideal form of the terrestrial time zone system.
A nautical date line is implied but not explicitly drawn on time zone maps. It follows the th meridian except where it is interrupted by territorial waters adjacent to land, forming gaps: it is a pole-to-pole dashed line.
A ship within the territorial waters of any nation would use that nation's standard time, but would revert to nautical standard time upon leaving its territorial waters.
The captain is permitted to change the ship's clocks at a time of the captain's choice following the ship's entry into another time zone. The captain often chooses midnight.
Ships going in shuttle traffic over a time zone border often keep the same time zone all the time, to avoid confusion about work, meal, and shop opening hours.
Still the time table for port calls must follow the land time zone. Ideal time zones, such as nautical time zones, are based on the mean solar time of a particular meridian located in the middle of that zone with boundaries located 7.
In practice, zone boundaries are often drawn much farther to the west with often irregular boundaries, and some locations base their time on meridians located far to the east.
They were obliged to follow German time during the war, and kept it thereafter. In the mid s the Netherlands, as with other European states, began observing daylight saving summer time.
In the Northern hemisphere, there is a tendency to draw time zone boundaries far to the west of their meridians. A reason is that it can allow the more efficient use of sunlight.
To make solar noon coincide more with awake time noon i. Many of these locations also use DST , adding yet another nautical time zone to the east.
This westernmost area of continental Spain never experiences sunset before clock time, even in midwinter, despite its lying more than 40 degrees north of the equator.
Stockholm has much earlier sunrises, though. Many countries, and sometimes just certain regions of countries, adopt daylight saving time also known as "Summer Time" during part of the year.
This typically involves advancing clocks by an hour near the start of spring and adjusting back in autumn "spring forward", "fall back".
Modern DST was first proposed in and was in widespread use in as a wartime measure aimed at conserving coal. Despite controversy , many countries have used it off and on since then; details vary by location and change occasionally.
Most countries around the equator do not observe daylight saving time, since the seasonal difference in sunlight is minimal.
Many computer operating systems include the necessary support for working with all or almost all possible local times based on the various time zones.
Internally, operating systems typically use UTC as their basic time-keeping standard , while providing services for converting local times to and from UTC, and also the ability to automatically change local time conversions at the start and end of daylight saving time in the various time zones.
See the article on daylight saving time for more details on this aspect. Web servers presenting web pages primarily for an audience in a single time zone or a limited range of time zones typically show times as a local time, perhaps with UTC time in brackets.
More internationally oriented websites may show times in UTC only or using an arbitrary time zone. The format is typically based in the W3C Note "datetime".
Email systems and other messaging systems IRC chat , etc. Database records that include a time stamp typically use UTC, especially when the database is part of a system that spans multiple time zones.
The use of local time for time-stamping records is not recommended for time zones that implement daylight saving time because once a year there is a one-hour period when local times are ambiguous.
Calendar systems nowadays usually tie their time stamps to UTC, and show them differently on computers that are in different time zones.
That works when having telephone or internet meetings. It works less well when travelling, because the calendar events are assumed to take place in the time zone the computer or smartphone was on when creating the event.
The event can be shown at the wrong time. Mit dem Inkrafttreten des erwähnten Zeitgesetzes galt sie ein Jahr später für das gesamte Reichsgebiet Umstellung am 1.
April Anders als in den meisten anderen Ländern wurde in Österreich Mitte des Seit dem 1. Längengrad war das ein gutes Mittel. Ab erfolgte die Ermittlung in der neuen Sternwarte Neuenburg , wurde aber weiterhin in Berner Ortszeit umgerechnet verbreitet.
Der Wechsel der Berner wurde von den anderen Kantonen zum selben Datum mitgemacht. Zu Lande obliegt es den jeweiligen Staaten, ihre Zeitrechnung gesetzlich zu regeln.
Die internationale Harmonisierung basiert auf Zusammenarbeit der internationalen und nationalen Zeitinstitute und zwischenstaatlichen Verträgen.
Auf den Weltmeeren und im Luftraum, wie auch in der Raumfahrt gelten die Usancen und Standards der internationalen See-, Luft- und Raumfahrt, die über die meist aus dem militärischen Bereich kommenden nationalen oder supranationalen Verbindlichkeiten wie zum Beispiel die Nautical time NATO geregelt sind.
Bei Ost-West- oder West-Ost-Reisen an Bord eines Schiffes wird die Zeitumstellung recht willkürlich gehandhabt und die Tage, an denen eine Umstellung erfolgt, den betrieblichen Erfordernissen an Bord entsprechend festgelegt.
In der Regel wird an einem Tag maximal eine Stunde umgestellt. Der Tag, an dem das geschieht, muss nicht zwingend mit dem Queren der geographischen Grenze zwischen zwei Zeitzonen zusammenfallen.
Nicht berücksichtigt sind gegebenenfalls international umstrittene Besitzansprüche in der Antarktis und durch Sommerzeiten bedingte Abweichungen.
Die Volksrepublik China hat dagegen heute nur noch eine s. Zum 9. Die Gründe für diese Sonderfälle sind meist die geographische Lage zwischen zwei Zeitzonen, wie auch historischer oder politischer Natur.
Frankreich und Spanien hatten allerdings schon vor dem europäischen Einigungsbestreben — Frankreich seit der deutschen Besatzung , Spanien seit einem Erlass Francos aus dem Jahr — anstatt der passenderen Westeuropäischen Zeit WEZ die MEZ, die dort bereits mit Normalzeit erheblich von der Sonnenzeit abweicht, so dass z.
Diese passt gut zur Hauptstadt Peking und zu Shanghai. In Kuba wurde aufgrund einer massiven Energiekrise beschlossen, in der Sommerzeit zu verbleiben.
In der Vergangenheit wurde oft einem besetzten Land die Zonenzeit der Besatzer aufgezwungen. Auch in den Niederlanden führte sie die MEZ ein.
In der Nacht zum Nordkorea kündigte Anfang August an, zum Jahrestag der Unabhängigkeit von der japanischen Kolonialherrschaft am Nordkorea behielt nach der Unabhängigkeit diese Zeit bei, während Südkorea — jedoch nur zwischen und — zur vor der Kolonisierung gültigen Zeit zurückwechselte.
Die Uhrzeitumstellung hat sich nicht überall bewährt und wurde von Regierung wie Bevölkerung nicht überall widerspruchslos hingenommen. In der Schweiz wurde die sommerliche Uhrzeitumstellung vom Volk zwar abgelehnt, später dann aber dennoch eingeführt, um keine Zeitinsel zu bilden.
Die Sommerzeit wurde in einigen Gebieten der Welt wieder abgeschafft. Border restrictions imposed on non-Japanese residents to stop the spread of COVID were seen as discriminatory by many, but they're not likely to prevent travel here in the future.
At the start of the year it was expected that 's buzzwords would all be related to the Olympics. Oh, how quickly that can change. The world-famous Beatle was killed on Dec.
President-elect Joe Biden as it was the regime in Tehran. The murder raises tensions in the Persian Gulf region as Iranian authorities threaten Most important, his team is composed of policy traditionalists who believe the U.
Various types of plastic react differently during the recycling process. If two different types are mixed together, the output will be a mishmash of limited economic value.