Time zone

Sri Lanka Standard Time Zonetime zoneslocal timetimezoneLocalPacific Time Zone (PTZ)Eastern timeESTtime-zoneGMT
A time zone is a region of the globe that observes a uniform standard time for legal, commercial, and social purposes.wikipedia
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Standard time

TimeAllegheny Time SystemEST
A time zone is a region of the globe that observes a uniform standard time for legal, commercial, and social purposes.
Applied globally in the 20th century, the geographical areas became extended around evenly spaced meridians into time zones which (usually) centered on them.

Nepal Standard Time

Nepal TimeNSTNPT
Most of the time zones on land are offset from Coordinated Universal Time (UTC) by a whole number of hours (UTC−12:00 to UTC+14:00), but a few zones are offset by 30 or 45 minutes (e.g. Newfoundland Standard Time is UTC−03:30, Nepal Standard Time is UTC+05:45, Indian Standard Time is UTC+05:30 and Myanmar Standard Time is UTC+06:30).
Nepal Standard Time (NPT) is the time zone for Nepal.

UTC−12:00

UTC−12Howland and Baker IslandsIDLW
Most of the time zones on land are offset from Coordinated Universal Time (UTC) by a whole number of hours (UTC−12:00 to UTC+14:00), but a few zones are offset by 30 or 45 minutes (e.g. Newfoundland Standard Time is UTC−03:30, Nepal Standard Time is UTC+05:45, Indian Standard Time is UTC+05:30 and Myanmar Standard Time is UTC+06:30).
It is the offset of the time zone that is the last to celebrate a New Year, sometimes referred to as the International Date Line West time zone (IDLW).

Time in Russia

local timeIRKTUTC+11:00
Russia is traditionally divided into 11 time zones, but in 2011 the number was reduced to nine.
There are eleven time zones in Russia, which currently observe times ranging from UTC+02:00 to UTC+12:00.

Sandford Fleming

Sanford FlemingSir Sandford Fleming
Scottish-born Canadian Sir Sandford Fleming proposed a worldwide system of time zones in 1879.
He promoted worldwide standard time zones, a prime meridian, and use of the 24-hour clock as key elements to communicating the accurate time, all of which influenced the creation of Coordinated Universal Time.

Time

temporaldurationsequence of events
Time zones tend to follow the boundaries of countries and their subdivisions instead of longitude, because it is convenient for areas in close commercial or other communication to keep the same time.
The position of the shadow marks the hour in local time.

Railway time

Railway time in IndiaRailway time of IndiaStandard railway time
This quickly became known as Railway Time.
Despite this early reluctance, railway time rapidly became adopted as the default time across the whole of Great Britain, although it took until 1880 for the government to legislate on the establishment of a single Standard Time and a single time zone for the country.

Time in the United States

time zonesEDTEST
Time in the United States, by law, is divided into nine standard time zones covering the states, territories and other US possessions, with most of the United States observing daylight saving time (DST) for approximately the spring, summer, and fall months.

Charles F. Dowd

Charles F. Dowd proposed a system of one-hour standard time zones for American railroads about 1863, although he published nothing on the matter at that time and did not consult railroad officials until 1869.
He was the first person to propose multiple time zones for any country, those for the railways of the United States.

Time in Canada

CSTCACanada
Canada is divided into six time zones, based on proposals by Scottish Canadian railway engineer Sir Sandford Fleming, who pioneered the use of the 24-hour clock, the world's time zone system, and a standard prime meridian.

Chicago

Chicago, IllinoisChicago, ILCity of Chicago
The offset from UTC changes with daylight saving time, e.g. a time offset in Chicago, which is in the North American Central Time Zone, is "−06:00" for the winter (Central Standard Time) and "−05:00" for the summer (Central Daylight Time).
In 1883, Chicago's railway managers needed a general time convention, so they developed the standardized system of North American time zones.

Time in Germany

GermanyBerlin TimeUTC+1
The time zone in Germany is Central European Time (Mitteleuropäische Zeit, MEZ; UTC+01:00) and Central European Summer Time (Mitteleuropäische Sommerzeit, MESZ; UTC+02:00).

UTC+08:00

UTC+8UTC+08GMT+8
Also, China extends as far west as 73°34′E, but all parts of it use UTC+08:00 (120°E), so solar "noon" can occur as late as 15:00 in western portions of China such as Xinjiang and Tibet.
With an estimated population of 1.708 billion living within the time zone, roughly 24% of the world population, it is the most populous time zone in the world, as well as a possible candidate for ASEAN Common Time.

Local mean time

mean timemeanLMT
A notable exception was Detroit (which is about halfway between the meridians of eastern time and central time) which kept local time until 1900, then tried Central Standard Time, local mean time, and Eastern Standard Time before a May 1915 ordinance settled on EST and was ratified by popular vote in August 1916.
This measurement of time was used for everyday use during the 19th century before time zones were introduced beginning in the late 19th century; it still has some uses in astronomy and navigation.

Daylight saving time

DSTdaylight savingPST
The offset from UTC changes with daylight saving time, e.g. a time offset in Chicago, which is in the North American Central Time Zone, is "−06:00" for the winter (Central Standard Time) and "−05:00" for the summer (Central Daylight Time). Some higher latitude and temperate zone countries use daylight saving time for part of the year, typically by adjusting local clock time by an hour.
The effect also varies according to how far east or west the location is within its time zone, with locations farther east inside the time zone benefiting more from DST than locations farther west in the same time zone.

Greenwich Mean Time

GMTGMT+4UTC±00:00
Greenwich Mean Time (GMT) was established in 1675, 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.
Most time zones were based upon GMT, as an offset of a number of hours (and possibly half or quarter hours) "ahead of GMT" or "behind GMT".

Coordinated Universal Time

UTCUTC-3UTC-4
Most of the time zones on land are offset from Coordinated Universal Time (UTC) by a whole number of hours (UTC−12:00 to UTC+14:00), but a few zones are offset by 30 or 45 minutes (e.g. Newfoundland Standard Time is UTC−03:30, Nepal Standard Time is UTC+05:45, Indian Standard Time is UTC+05:30 and Myanmar Standard Time is UTC+06:30).
Time zones around the world are expressed using positive or negative offsets from UTC, as in the list of time zones by UTC offset.

Philippine Standard Time

PSTPHTPhilippines Standard Time
The country only uses one time zone (UTC+08:00), and for a short period, it also used daylight saving time.

Time in Brazil

BRTBRT-1Brasília Time
Time in Brazil is calculated using standard time, and the country (including its offshore islands) is divided into four standard time zones: UTC−02:00, UTC−03:00, UTC−04:00 and UTC−05:00.

UTC offset

time offset from UTCtime offsetoffsets from UTC
Offsets from UTC are written in the format ±[hh]:[mm], ±[hh] [mm], or ±[hh] (either hours ahead or behind UTC).
A time zone is a geographical region in which residents observe the same standard time.

Sundial

sundialssun dialsun clock
Before clocks were invented, it was common practice to mark the time of day with apparent solar time (also called "true" solar time) – for example, the time on a sundial – which was typically different for every location and dependent on longitude.
A standard time zone covers roughly 15° of longitude, so any point within that zone which is not on the reference longitude (generally a multiple of 15°) will experience a difference from standard time equal to 4 minutes of time per degree.

Time in Indonesia

WIBIWSTIndonesia Western Time
Daylight saving time is not currently observed anywhere in Indonesia, resulting in all regions using their respective time zone all year long.

UTC+11:30

+11:30
This time zone has been used as standard time in New Zealand and Norfolk Island, but is no longer used as a time zone anywhere.

Palmyra Atoll

Palmyra IslandPalmyraUnited States Territory of Palmyra Island
Palmyra Atoll is in the Samoa Time Zone (UTC−11:00), the same time zone as American Samoa, Midway Atoll, Kingman Reef and Jarvis Island.

Oregon

ORState of OregonOregon, USA
Oregon lies in two time zones.