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A time zone is an area which observes a uniform standard time for legal,commercial and social purposes. Time zones tend to follow the boundaries between countries and their subdivisions instead of strictly following longitude,because it is convenient for areas in frequent communication to keep the same time.
Japan Standard Time,or Japan Central Standard Time,is the standard time zone in Japan,9 hours ahead of UTC (UTC+09:00). Japan does not observe daylight saving time,though its introduction has been debated on several occasions. During World War II,the time zone was often referred to as Tokyo Standard Time.
In the United States,time is divided into nine standard time zones covering the states,territories and other US possessions,with most of the country observing daylight saving time (DST) for approximately the spring,summer,and fall months. The time zone boundaries and DST observance are regulated by the Department of Transportation,but no single map of those existed until the agency announced intentions to make one in September 2022. Official and highly precise timekeeping services (clocks) are provided by two federal agencies:the National Institute of Standards and Technology (NIST);and the United States Naval Observatory (USNO). The clocks run by these services are kept synchronized with each other as well as with those of other international timekeeping organizations.
Summer time in Europe is the variation of standard clock time that is applied in most European countries in the period between spring and autumn,during which clocks are advanced by one hour from the time observed in the rest of the year,with a view to making the most efficient use of seasonal daylight. It corresponds to the notion and practice of daylight saving time (DST) to be found in some other parts of the world.
Time in New Zealand is divided by law into two standard time zones. The main islands use New Zealand Standard Time (NZST),12 hours in advance of Coordinated Universal Time (UTC) / military M (Mike),while the outlying Chatham Islands use Chatham Standard Time (CHAST),12 hours 45 minutes in advance of UTC / military M^ (Mike-Three).
The Atlantic Time Zone is a geographical region that keeps standard time—called Atlantic Standard Time (AST)—by subtracting four hours from Coordinated Universal Time (UTC),resulting in UTC−04:00. AST is observed in parts of North America including several Caribbean islands. During part of the year,some portions of the zone observe daylight saving time,referred to as Atlantic Daylight Time (ADT),by moving their clocks forward one hour to UTC−03:00. The clock time in this zone is based on the mean solar time of the 60th meridian west of the Greenwich Observatory.
UTC+08:00 is an identifier for a time offset from UTC of +08:00.
South African Standard Time (SAST) is the time zone used by all of South Africa as well as Eswatini and Lesotho. The zone is two hours ahead of UTC (UTC+02:00) and is the same as Central Africa Time. Daylight saving time is not observed in either time zone. Solar noon in this time zone occurs at 30° E in SAST,effectively making Pietermaritzburg at the correct solar noon point,with Johannesburg and Pretoria slightly west at 28° E and Durban slightly east at 31° E. Thus,most of South Africa's population experience true solar noon at approximately 12:00 daily.
Australia uses three main time zones:Australian Eastern Standard Time,Australian Central Standard Time and Australian Western Standard Time.
There are 11 time zones in Russia,which currently observe times ranging from UTC+02:00 to UTC+12:00. Daylight saving time (DST) has not been used in Russia since 26 October 2014. From 27 March 2011 to 26 October 2014,permanent DST was used.
Jang Yeong-sil was a Korean mechanical engineer,scientist,and inventor during the Joseon dynasty (1392–1897). Although Jang was born a peasant,King Sejong allowed Jang to work at the royal palace. Jang's inventions,such as the Cheugugi and the water gauge,highlight the technological advancements of the Joseon dynasty.
Malaysian Standard Time or Malaysian Time (MYT) is the standard time used in Malaysia. It is 8 hours ahead of Coordinated Universal Time (UTC). Malaysia does not observe daylight saving time.
Iran Standard Time (IRST) or Iran Time (IT) is the time zone used in Iran. Iran uses a UTC offset UTC+03:30. IRST is defined by the 52.5 degrees east meridian,the same meridian which defines the Iranian calendar and is the official meridian of Iran.
The Borugak Jagyeongnu,classified as a scientific instrument,is the 229th National Treasure of South Korea and was designated by the South Korean government on March 3,1985. The water clock is currently held and managed by the National Palace Museum of Korea in Seoul. It dates to the time of King Sejong of the Joseon Dynasty.
Time in North Korea,called Pyongyang Time or Standard Time of the Democratic People's Republic of Korea,is since May 2018 equal to Korea Standard Time:9 hours ahead of UTC (UTC+09:00). Like South Korea,North Korea does not currently observe daylight saving time. Time keeping in North Korea is under the State Commission for Science and Technology.
Ireland uses Irish Standard Time in the summer months and Greenwich Mean Time in the winter period.
As of 2018,daylight saving time (DST) is permanently observed in Morocco. Previously,time was advanced to UTC+01:00 at 02:00 on the last Sunday of March,and reverted to UTC+00:00,defined as Greenwich Mean Time locally,at 03:00 on the last Sunday of October. This practice was continued until October 2018,after which clocks were permanently advanced. An exception was made during the month of Ramadan during which clocks reverted to UTC+00:00.
Denmark,including its dependencies of Faroe Islands and Greenland,uses six time zones.
Jang Yeong-sil (Korean: 장영실) is a 2016 South Korean historical drama television series starring Song Il-kook,Kim Yeong-cheol,Kim Sang-kyung and Park Sun-young. It replaced The Jingbirok:A Memoir of Imjin War and aired on KBS1 from January 2,2016 to March 26,2016 on Saturdays and Sundays at 21:40 (KST) for 24 episodes.
Time in Palau is given by Palau Time. Palau does not have an associated daylight saving time.
References
- ↑ "표준시" [Standard Time]. Doosan Encyclopedia (in Korean). Retrieved 2018-03-03.
- ↑ "KST". Geospatial Information System Glossary (in Korean). Retrieved 2018-03-03.
- ↑ "Current Local Time in South Korea". timeanddate.com.
- 1 2 Chad, Norman (1987-01-30). "Live From Seoul, 1988 Olympics Now Are Ready For Prime Time". Washington Post. ISSN 0190-8286 . Retrieved 2018-03-03.
- ↑ Chappell, Bill (2017-03-29). "The Olympics' TV Time-Delay Is Going Away, NBC Says". National Public Radio. Retrieved 2018-03-03.
- ↑ Pak, Sŏng-nae (2005). Science and Technology in Korean History: Excursions, Innovations, and Issues. Jain Publishing Company. pp. 96–99. ISBN 0895818388.
- ↑ Park, Changbom (2008). Astronomy: Traditional Korean Science. Ewha Womans University Press. p. 135. ISBN 978-8973007790.
- ↑ Yu, Jeong-in (2010-08-09). "1961년 표준자오선 동경 135도로 변경" [1961 Standard Meridian Changed to 135 Degrees East]. Kyunghyang Shinmun . Retrieved 2018-03-03.
- ↑ "North Korea's new time zone to break from 'imperialism'". BBC News. 2015-08-07. Retrieved 2018-03-03.
- ↑ "Turning back the clock: North Korea creates Pyongyang Standard Time". Reuters. 2015-08-07. Retrieved 2018-03-03.
- ↑ Westcott, Ben; Yoonjung, Seo; Watkins, Eli (29 April 2018). "North Korea will close main nuclear test site in May, South says". CNN. Retrieved 29 April 2018.
- ↑ "혼란 주던 '30분 시차' 사라진다…서울 표준시로 "통일"" (in Korean). 2018-04-29. Retrieved 2018-04-29.
