Local time in GREENWICH - UNITED KINGDOM
Greenwich - United Kingdom Speaking clock provides precise time
Synchronized clock on atomic clock in real time
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Current Local time
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Greenwich timezone information
Geographical and astronomical datas : United Kingdom
About time in Europe England United Kingdom Greenwich
This is due to fractional hour offsets and zones with offsets larger than 12 hours near the International Date Line as well as one unofficial zone in Australia
See the list of time zones.
The largest time gap along a political border is the 3.5 hour gap along the border of China (UTC+08) and Afghanistan (UTC+04:30).
One of the most unusual time zones is the Australian Central Western Time zone (CWST), which is a small strip of Western Australia from the border of South Australia west to 125.5°E, just before Caiguna
It is 8¾ hours ahead of UTC (UTC+08:45) and covers an area of about 35,000 km2, larger than Belgium, but has a population of about 200
Although unofficial, it is universally respected in the area—without it, the time gap in standard time at 129°E (the WA/SA border) would be 1.5 hours
Internet and computer systems
UTC is often used on the Internet for meetings (i.e IRC chats, news, shows and so on).
For e-mail, the sender time zone is used to calculate the send time, but this time is recalculated by the receiver mail client, and shown according to the receiver time zone.
On websites with mainly domestic audiences local time is often used, sometimes with UTC in brackets: e.g
the international English-language version of CNN includes GMT and Hong Kong Time, US Eastern Time and Pacific Time are also used fairly commonly on many US-based English-language websites with global readership.
The format is based in the W3C Note "datetime".
On the other hand, most modern computer operating systems include information about time zones, including the capability to automatically change the local time when daylight saving starts and finishes (see the article on daylight saving time for more details on this aspect).
Most Unix-like systems, including Linux and Mac OS X, keep system time as UTC (Coordinated Universal Time)
Rather than having a single time zone set for the whole computer, timezone offsets can vary for different processes
Standard library routines are used to calculate the local time based on the current timezone, normally supplied to processes through the TZ environment variable
This allows users in multiple timezones to use the same computer, with their respective local times displayed correctly to each user
Timezone information is most commonly stored in a timezone database known as tz database (or sometimes zoneinfo or Olson format)
In fact, many systems, including anything using the GNU C Library, can make use of this database.
Windows-based computer systems normally keep system time as local time in a particular time zone