World clock
With the world clock (せかいどけい, World clock), it is one of the addition functions of the clock.
Other than the local clock using it, I did the local clock of all parts of the world.
I am said to be "a global clock".
Table of contents
Summary
The world clock as a function of the clocks,
- Other than local time (local time) to normally use, I can display other local time by a simple change.
- I displayed several common clocks and let you display the main local time and knew the time of all parts of the world at a glance.
But, there is it. In addition to utility, I may have both decorative elements coming from an international image.
1.I may be implemented by については, a table clock and a high-performance watch. I can easily change it in time of the all parts of the world area, and it is not necessary to align it one by one at the time. In addition, there is the thing which can display plural time (usually two of an own area and another area).
2.A plural number displays の case, several clocks (usually analog wall clock) and lets you display the time with each local name (the city name). It is often raised in the front desk or the securities exchange of the budget hotel.
In late years the function of the world clock colonizes as basic software such as a PC, the PDA and there is much multifunctional software including the freeware and is shown and is established a site having world clock function on the Internet a lot. In addition, to the digital gadgets such as a cell-phone, a smartphone, the digital camera, the function of the world clock may be equipped with by a built-in clock and is utilized in the case of the international call, and the functions that calculate the difference in time in the photography place in the digital camera, and can automatically modify the photography date and time may be equipped with.
Change in the standard
(time zone) is often changed in a standard becoming the cause of the world clock. The date line on the Pacific was changed in 1995, and standard time of +14 was added in UTC. Similarly, I am changed in the form that Samoa changes the date line from UTC-11 (because during daylight saving time enforcement UTC-10) to from December, 2011 in (because during daylight saving time enforcement UTC +14) in +13 in UTC. In addition, the Venezuelan standard time including Caracas was changed to UTC-4:30 from 2007 (changed to UTC-4 on May 1, 2016). At Russian time, I am changed with 2014 in 2011 for 2,010 years, and, unification, subdivision, an area change in standard time, the abolition in daylight saving time is carried out again, too, and, for example, it is (there is no it in daylight saving time) now in +3 in UTC in standard time of Moscow.
The update after the time zone change is relatively easy by the world clock function by the computer software, but difficulty is accompanied from the aspects such as expenses, or it becomes structurally impossible that update remodels the world clock function after after production to completion with the clocks such as a watch, a table clock, the building. Therefore, attention is necessary some other time whether indication in the local standard time that I want to take advantage of is accuracy including the particularly area mentioned above when I use a world clock.
Correspondence to daylight saving time
There is the period when the time is advanced in the area with the daylight saving time, and, in that case, world clock of the daylight saving time correspondence is convenient. The enforcement period of the daylight saving time varies according to each area, and, even in the case of enforcement, there is a gap at the start end time according to average year by a year, and there are cancellation, the area reopen it or to carry out newly; every year with the change (because, in addition, a season reverses in the Northern Hemisphere and the Southern Hemisphere, daylight saving time is approximately always carried out world somewhere). Therefore, it is difficult to let you always give an automatic response in daylight saving time of the world whole area even if it is a world clock, and the user is hand-operated, and it is necessary to set it.
Because but I automatically often give all responses in the world clock site in the Internet top in daylight saving time particularly I may not cope about the daylight saving time of some areas, attention is necessary.
Difference in time correction mechanism
As a function associated with the world clock, there is the thing which a difference in time correction mechanism is put on in the digital gadget with a built-in including the table clock for a watch and the trip and cell-phone, clock including the digital camera.
It is the function that can easily revise the time of the clock at the local time when I moved to the different time zone, and a method mechanical, to revise with a dragon-head gargoyle or a manual operation button with the quartz type is mainstream. The methods that I receive a local standard radio wave by an appearance of the radio time signal and can revise automatically including daylight saving time spread, but the standard radio wave of the long wave which I can receive with a clock is limited to Europe, the United States, China any place other than Japan, and, in that case, still this method revises a lot of areas that are not usable by the method like the quartz type in the world.
As for the difference in time correction mechanism, there are almost many methods to reverse, and to display the field time and the partner ahead time by using this function because I misappropriate a world clock function integrating into a clock. In addition, it is necessary to revise the time by manual operation because the difference in time correction mechanism does not support in a time zone and the daylight saving time when I do not cope with a world clock.
After 2011, two methods came up for the difference in time correction mechanism of the watch more. And I receive positional information with a watch, and one pays its attention to what a cell-phone and a smartphone always revise the time of the point by the communication with the base station now, and a method (I refer to the GPS watch), the other which estimate the local time, and synchronize with a watch can display exactly the time of the GPS and is a method to synchronize with a watch by communication facility of Bluetooth at the time. But it is good points and bad points under the present conditions both because the GPS method does not function when it is not the outdoors that GPS can receive, and the Bluetooth method does not function if there are not always smartphones of the coping model near.
The Bluetooth method (G-SHOCK GB-6900AA,GB-5600AA) that Casio adopted supports all current time zones with the world clock, difference in time correction mechanism, and only a difference in time correction mechanism gives a complete response in daylight saving time. The GPS method of SEIKO automatically receives an electric wave (time information, positional information) once a day and copes with all current time zones with the world clock, difference in time correction mechanism, but is a manual operation correction in daylight saving time. The GPS method of the citizen has to perform the electric wave reception (only as for the time information) by manual operation (as for the model as of 2015) and I cope only with a main time zone with a world clock function, the difference in time correction mechanism and am a manual operation correction in daylight saving time. The GPS method of Casio incorporates the map information that divided the whole world into a 500m square division and I compare map information with an electric wave (time information, positional information) which I received and a change is automatic and is performed in world clock, a difference in time correction, daylight saving time.
Allied item
- Greenwich Mean Time (GMT)
- Conventional world time (UTC)
- The huge world clock in the Urania world clock - Germany capital Berlin City (old East Berlin district) Alexander open space.
Outside link
This article is taken from the Japanese Wikipedia World clock
This article is distributed by cc-by-sa or GFDL license in accordance with the provisions of Wikipedia.
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