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Online Time Calculators

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Time Calculators

Here we discuss list of online weight Conversion calculators that help us for doing calculation easily.

1. Age Calculator

The Age Calculator can determine the age or interval between two dates. The calculated age will be displayed in years, months, weeks, days, hours, minutes, and seconds.

The age of a person can be counted differently in different cultures. This calculator is based on the most common age system. In this system, age grows at the birthday. For example, the age of a person that has lived for 3 years and 11 months is 3 and the age will turn to 4 at his/her next birthday one month later. Most western countries use this age system.

In some cultures, age is expressed by counting years with or without including the current year. For example, one person is twenty years old is the same as one person is in the twenty-first year of his/her life. In one of the traditional Chinese age systems, people are born at age 1 and the age grows up at the Traditional Chinese New Year instead of birthday. For example, if one baby was born just one day before the Traditional Chinese New Year, 2 days later the baby will be at age 2 even though he/she is only 2 days old.

In some situations, the months and days result of this age calculator may be confusing, especially when the starting date is the end of a month. For example, we all count Feb. 20 to March 20 to be one month. However, there are two ways to calculate the age from Feb. 28, 2015 to Mar. 31, 2015. If thinking Feb. 28 to Mar. 28 as one month, then the result is one month and 3 days. If thinking both Feb. 28 and Mar. 31 as the end of the month, then the result is one month. Both calculation results are reasonable. Similar situations exist for dates like Apr. 30 to May 31, May 30 to June 30, etc. The confusion comes from the uneven number of days in different months. In our calculation, we used the former method.

2. Time Calculator

This calculator can be used to "add" or "subtract" two time values. Input fields can be left blank, which will be taken as 0 by default.

Add or Subtract Time from a Date

Use this calculator to add or subtract time (days, hours, minutes, seconds) from a starting time and date. The result will be the new time and date based on the subtracted or added period of time. To calculate the amount of time (days, hours, minutes, seconds) between times on two different dates, use the Time Duration Calculator.

Time Calculator in Expression

Use this calculator to add or subtract two or more time values in the form of an expression. An acceptable input has d, h, m, and s following each value, where d means days, h means hours, m means minutes, and s means seconds. The only acceptable operators are + and -. "1d 2h 3m 4s + 4h 5s - 2030s" is an example of a valid expression.


3. Birthday Calculator

Birthday calculator automatically grabs the current date from your computer or cell phone & asks you to enter your date of birth. After entering your birth day click on the calculate button & it will automatically calculate your exact age today in years, days. If you wanted to know how old you were when something happened in the past, simply enter the date of the event at the top part of the calculator & it will calculate how old you were then.

The age of a person can be counted differently in different cultures. This calculator is based on the most common age system. In this system, age grows at the birthday. For example, the age of a person that has lived for 3 years and 11 months is 3 and the age will turn to 4 at his/her next birthday one month later. Most western countries use this age system.

How to Check Age using Online Birthday Calculator?

To use Birthday Calculator Online you will only need two things, person’s date of birth (dd / mm / yyyyy) and the date you seek to calculate the age in that format as well.

Input all information in the birthday calculator field, press calculate, then you can see the result not only of the age of the person. Using this birthday Calculators you can find your age in years and months.

4. Alaska Time

The Alaska Time Zone observes standard time by subtracting nine hours from Coordinated Universal Time (UTC−09:00). During daylight saving time its time offset is eight hours (UTC−08:00). The clock time in this zone is based on mean solar time at the 135th meridian west of the Greenwich Observatory.

The zone includes nearly all of the U.S. state of Alaska and is one hour behind the Pacific Time Zone.

standard time: Alaska Standard Time (AKST)

daylight saving time: Alaska Daylight Time (AKDT)

The western Aleutian Islands observe Hawaii–Aleutian Time, one hour behind the remainder of the state.

The largest city in the Alaskan Time Zone is Anchorage, Alaska. The Anchorage Metropolitan Area is the largest metropolitan area in the zone.

Effective from 2007, the local time changes from AKST to AKDT at 02:00 LST to 03:00 LDT on the second Sunday in March and returns at 02:00 LDT to 01:00 LST on the first Sunday in November.


5. Bangkok Time

Thailand follows UTC+07:00, which is 7 hours ahead of UTC. The local mean time in Bangkok was originally UTC+06:42:04.[1] Thailand used this local mean time until 1920, when it changed to Indochina Time, UTC+07:00; ICT is used all year round as Thailand does not observe daylight saving time. Thailand shares the same time zone with Vietnam, Cambodia, Laos, Christmas Island, and Western Indonesia.

6. Beijing Time

The official national standard time is called Beijing Time (Chinese: 北京时间) domestically and China Standard Time (CST) internationally. Daylight saving time has not been observed since 1991. The time in China follows a single standard time offset of UTC+08:00 (eight hours ahead of Coordinated Universal Time), despite China spanning five geographical time zones.

In the 1870s, the Shanghai Xujiahui Observatory was constructed by a French Catholic missionary. In 1880s officials in Shanghai French Concession started to provide a time announcement service using the Shanghai Mean Solar Time provided by the aforementioned observatory for ships into and out of Shanghai. By the end of 19th century, the time standard provided by the observatory had been switched to UTC+08:00. The practice has spread to other coastal ports, and in 1902 the "Coastal Time" was proposed to be the universal time zone for all the coastal ports in China. However, the time zone for the rest of China remained undetermined.

Until 1913, the official time standard for the whole of China was still the apparent solar time of Beijing, the capital of the country at the time. Starting in 1914, the Republic of China government began adopting the Beijing Local Mean Solar Time as the official time standard. By 1918, five standard time zones had been proposed by the Central Observatory of Beiyang government of Republic of China, including the Kunlun (UTC+05:30), Sinkiang-Tibet (UTC+06:00), Kansu-Szechwan (UTC+07:00), Chungyuan (UTC+08:00), and Changpai (UTC+08:30).


7. British Summer Time

the UK, the Daylight Saving (DST) period is is known as British Summer Time or BST for short.During British Summer Time (BST), civil time in the United Kingdom is advanced one hour forward of Greenwich Mean Time (GMT) (in effect, changing the time zone from UTC+00:00 to UTC+01:00), so that mornings have one hour less daylight, and evenings one hour more.

When BST starts, the UK moves its clocks forward from GMT by one hour, so BST= GMT+1.

The UK is the short name for the United Kingdom of Great Britain and Northern Ireland. Great Britain consists of England, Wales and Scotland.Since 1996 all clocks in the European Union have changed on same dates and at the same time, 1:00 am GMT. UK left the EU on 31 January 2020 and is in a transition period till the end of 2020. There have been no announcements so far about post-EU Daylight Saving Time (DST) rules.

8. California Time

California is in the Pacific Time Zone in the United States of America (USA). US Pacific Standard Time (PST) is 8 hours behind Greenwich Mean Time ( GMT-8 ).

Does California observe Daylight Saving Time?

Like most states in the USA, Daylight Saving Time (DST) is observed in California, where the time is shifted forward by 1 hour to Pacific Daylight Time (PDT), which is 7 hours behind Greenwich Mean Time ( GMT-7 ).

After the summer months the time in California is shifted back by 1 hour to US Pacific Standard Time (PST) or (GMT-8)


9. Chicago Time

Chicago is a city of United States. The official language is English, and the currency is United States Dollar (USD). The international dial code for United States is 1. The timezone Chicago located is Central Standard Time(Abbr:CST).

Chicago is in Central Time Zone and is -6 of GMT. So when it is 12:00 Noon Zulu or GMT, it is 6:00 AM Chicago or Central time. If you dont know, Zulu or GMT is the time at the Prime Meridian, which is in England. The major city would be London for reference. Chicago is close to the border of Central and Eastern time zones, in fact, for the most part, the Illinois/Indiana board is the line between Central and Eastern.

10. China Time

The time in China follows a single standard time offset of UTC+08:00 (eight hours ahead of Coordinated Universal Time), despite China spanning five geographical time zones. The official national standard time is called Beijing Time domestically and China Standard Time (CST) internationally. Daylight saving time has not been observed since 1991.

In China, they have only one time zone, GMT+8. This means that the time across the country is always 8 hours ahead of GMT (Greenwich Mean Time). This is known as Beijing Time, though it is the standard across all five different time zones that exist in China. This can sometimes create confusion in different parts of the country. In the West and East the sun may appear in different places but the official time calculation will be the same. Much like as if the entire United States ran on D.C. time, this affects people who live in the areas farthest from Beijing the most.


11. Central Time

Central Standard Time is observed during the winter months. While Central Daylight Time (CDT) is observed during daylight saving time in the spring, summer, and autumn months. There are areas which do not follow daylight saving time. In these areas Central Standard Time is observed year-around. In the United States and Canada, Central Standard Time is commonly shortened to Central Time (CT).

The North American Central Time Zone (CT) is a time zone in parts of Canada, the United States, Mexico, Central America, some Caribbean Islands, and part of the Eastern Pacific Ocean.

Effective 2007, the local time changes from CST to CDT at 02:00 LST to 03:00 LDT on the second Sunday in March, and returns at 02:00 LDT to 01:00 LST on the first Sunday in November.

The Central Time zone is an area 6 hours behind Greenwich Mean Time (GMT-6) during the winter months (referred to as Central Standard Time or CST) and 5 hours behind Greenwich Mean Time (GMT-5) during the summer months (referred to as Central Daylight Time or CDT).

12. Eastern Daylight Time

The Eastern Time Zone (ET) is a time zone encompassing part or all of 23 states in the eastern part of the United States, parts of eastern Canada, the state of Quintana Roo in Mexico, Panama in Central America, and Colombia, mainland Ecuador, Peru, and a small portion of westernmost Brazil in South America, along with certain Caribbean and Atlantic islands.

Places that use:

Eastern Standard Time (EST), when observing standard time (autumn/winter), are five hours behind Coordinated Universal Time (UTC−05:00).

Eastern Daylight Time (EDT), when observing daylight saving time (spring/summer), are four hours behind Coordinated Universal Time (UTC−04:00).

In the northern parts of the time zone, on the second Sunday in March, at 2:00 a.m. EST, clocks are advanced to 3:00 a.m. EDT leaving a one-hour "gap". On the first Sunday in November, at 2:00 a.m. EDT, clocks are moved back to 1:00 a.m. EST, thus "duplicating" one hour. Southern parts of the zone (Panama and the Caribbean) do not observe daylight saving time.

The largest city in the Eastern Time Zone is New York; the New York metropolitan area is the largest metropolitan area in the zone.


13. Eastern Time

The Eastern Time Zone is also known as Eastern Standard Time (EST) falls mostly along the east coast of North America. Its time offset is −5 hours (UTC/GMT -5) during standard time and −4 hours (UTC/GMT -4) during daylight saving time. The time in this zone is based on the mean solar time of the 75th meridian west of the Greenwich Observatory.

Eastern Time (ET)

In the United States and Canada, this time zone is generally called Eastern Time (ET). Specifically, it is Eastern Standard Time (EST) when standard time is observed (winter), and Eastern Daylight Time (EDT) when daylight saving time is observed (spring, summer and autumn).

Effective since 2007, the local time changes from EST to EDT at 02:00 LST to 03:00 LDT on the second Sunday in March, and returns at 02:00 LDT to 01:00 LST on the first Sunday in November, in the U.S.A. as well as in Canada.

14. Greenwich Mean Time

Greenwich Mean Time (GMT) is the mean solar time at the Royal Observatory in Greenwich, London, reckoned from midnight. At different times in the past, it has been calculated in different ways, including being calculated from noon; as a consequence, it cannot be used to specify a precise time unless a context is given.

Greenwich Mean Time or GMT is clock time at the Royal Observatory in Greenwich, London. It is not affected by Summer Time (Daylight Saving Time) clock changes.

When the sun is at its highest point exactly above the Prime Meridian, it is 1200 noon at Greenwich.

Check out the GMT timestamp to see how accurate your computer time is.

GMT is also a time zone, used by the United Kingdom of Great Britain and Northern Ireland (UK) when Daylight Saving Time is not in use, from October to March.

The Greenwich Meridian (Prime Meridian or 0° Degrees Longitude) marks the starting point of every Time Zone of the time zone map.


15. Hawaii Time

Hawaii is in theHawaii-Aleutian Time Zone in the United States, which is 10 hours behind Greenwich Mean Time ( GMT-10 ).

The Hawaii–Aleutian Time Zone observes Hawaii–Aleutian Standard Time (HST), by subtracting ten hours from Coordinated Universal Time (UTC−10:00). The clock time in this zone is based on the mean solar time of the 150th meridian west of the Greenwich Observatory.

The zone takes its name from the two areas it includes: Hawaii and the portion of Alaska's Aleutian Islands west of 169° 30′ W longitude.

During daylight saving time (DST), the Alaskan portion observes Hawaii–Aleutian Daylight Time (HDT, UTC−09:00), while Hawaii stays on standard time.

From 1900 until 1947, UTC−10:30 was used as standard time in Hawaii.

French Polynesia uses UTC−10:00 for its major cities. The Cook Islands also use the same time. These areas do not use DST. "Hawaii–Aleutian Time Zone" is a U.S. term and for that reason the Polynesian areas are not considered to be a part of the Hawaii–Aleutian Time Zone.

The largest city in the Hawaii–Aleutian Time Zone is Honolulu; the Honolulu Metropolitan Area is the largest metropolitan area in the zone.

16. Hong Kong Time

Hong Kong Time is the time in Hong Kong, observed at UTC+08:00 all year round.The Hong Kong Observatory is the official timekeeper of the Hong Kong Time.

Currently, Hong Kong time is defined as UTC+08:00. The reference in section 67(2) to the Oil (Conservation and Control) Ordinance is actually a power given to the Legislative Council of Hong Kong to change Hong Kong Time for the purposes of conserving oil, i.e. to implement daylight saving time. However, no daylight saving time has been observed since 1979.

The Hong Kong Time was first set to Local Mean Time (GMT+07:36:42) on 1 January 1885 at 13:00 by the then Royal Observatory Hong Kong. In 1904, the Greenwich Mean Time was adopted as the basis for Hong Kong Time, the time was set at 8 hours in advance of Greenwich Mean Time. The current Coordinated Universal Time system was adopted as an official time standard on 1 January 1972. However, the legal Hong Kong Time still remained based on Greenwich Mean Time until it was changed to Universal Standard Time in 1998 after the Hong Kong handover./p>

17. Houston Time

Houston, Texas is located in the Central Time Zone, which means that the time is Central Standard Time (CST) during regular time and Central Daylight Time (CDT) when daylight savings is in effect.

When it is Central Standard Time, Houston, Texas is UTC-06:00 which means that it is -6 hours offset from Coordinated Universal Time (UTC).

When it is Central Daylight Time, Houston, Texas will be UTC-05:00 which means that it is -5 hours offset from Coordinated Universal Time (UTC)

18. India Time

Indian Standard time (IST) is the time zone observed throughout India, with a time offset of UTC+05:30. India does not observe daylight saving time or other seasonal adjustments. In military and aviation time IST is designated E* ("Echo-Star").

Indian Standard Time is calculated on the basis of 82.5°E longitude in the city of Mirzapur, Uttar Pradesh, which is situated approximately on the corresponding longitude reference line.

After Independence in 1947, the Union government established IST as the official time for the whole country, although Kolkata and Mumbai retained their own local time (known as Calcutta Time and Bombay Time) until 1948 and 1955, respectively. The Central observatory was moved from Chennai to a location at Shankargarh Fort in Prayagraj district, so that it would be as close to UTC+05:30 as possible.

Daylight Saving Time (DST) was used briefly during the China–India War of 1962 and the Indo-Pakistani Wars of 1965 and 1971.


19. IST Time

IST (Indian Standard Time) is one of the well-known names of UTC+5:30 time zone which is 5:30h. ahead of UTC (Coordinated Universal Time).The time offset from UTC can be written as +05:30.

Indian Standard time (IST) is the time zone observed throughout India, with a time offset of UTC+05:30. India does not observe daylight saving time or other seasonal adjustments. In military and aviation time IST is designated E* ("Echo-Star").

Indian Standard Time is calculated on the basis of 82.5°E longitude in the city of Mirzapur, Uttar Pradesh, which is situated approximately on the corresponding longitude reference line.

After Independence in 1947, the Union government established IST as the official time for the whole country, although Kolkata and Mumbai retained their own local time (known as Calcutta Time and Bombay Time) until 1948 and 1955, respectively. The Central observatory was moved from Chennai to a location at Shankargarh Fort in Prayagraj district, so that it would be as close to UTC+05:30 as possible.

Daylight Saving Time (DST) was used briefly during the China–India War of 1962 and the Indo-Pakistani Wars of 1965 and 1971.

20. Japan Time

Japan Standard Time abbreviated as JST, is the standard time zone in Japan, 9 hours ahead of UTC (i.e. it is UTC+09:00). There is no daylight saving time, though its introduction has been debated several times. During World War II, it was often called Tokyo Standard Time.

Japan Standard Time is the same as Korean Standard Time, Pyongyang Time (North Korea), Eastern Indonesia Standard Time, East-Timorese Standard Time and Yakutsk Time (Russia).

From 1948 to 1952, Japan observed daylight saving time (DST) between May and September every year. The United States imposed this policy as part of the Allied occupation of Japan. In 1952, three weeks before the occupation ended, the Japanese government, which had been granted increased powers, abolished daylight saving time, and the Allied occupation authorities did not interfere.Since then, DST has never been officially implemented nationwide in Japan.

Starting in the late 1990s, a movement to reinstate DST in Japan gained some popularity, aiming at saving energy and increasing recreational time. The Hokkaido region is particularly in favor of this movement because daylight starts as early as 03:30 (in standard time) there in summer due to its high latitude and its location near the eastern edge of the time zone, with much of the region's solar time actually closer to UTC+10:00. Because of this, the sun sets barely after 19:00 in much of the eastern part of the country (in Tokyo, the latest sunset of the entire year is 19:01, from June 26 to July 1, despite being at 35°41'N latitude). After 2000, a few local governments and commerce departments promoted unmandated hour-earlier work schedule experiments during the summer without officially resetting clocks.

The Council on Economic and Fiscal Policy of the Cabinet Office is expected(written October 2013) to propose that the Japanese government begin studying DST in an attempt to help combat global warming. Japanese Prime Minister Shinzō Abe made a significant effort to introduce daylight saving time, but was ultimately unsuccessful. However, it is not clear that DST would conserve energy in Japan. A 2007 simulation estimated that introducing DST to Japan would increase energy use in Osaka residences by 0.13%, with a 0.02% saving due to lighting more than outweighed by a 0.15% increase due to cooling costs; the simulation did not examine non-residential buildings.


21. Los Angeles Times

The Los Angeles Times (sometimes abbreviated as LA Times) is a daily newspaper based in El Segundo, California, which has been published in Los Angeles, California, since 1881. It has the fifth-largest circulation in the U.S., and is the largest American newspaper not headquartered on the East Coast. The paper focuses its coverage of issues particularly salient to the West Coast, such as immigration trends and natural disasters. It has won more than 40 Pulitzer Prizes for its coverage of these and other issues. As of June 18, 2018, ownership of the paper is controlled by Patrick Soon-Shiong, and the executive editor is Norman Pearlstine.

In the 19th century, the paper developed a reputation for civic boosterism and opposition to labor unions, the latter of which led to the bombing of its headquarters in 1910. The paper's profile grew substantially in the 1960s under publisher Otis Chandler, who adopted a more national focus. In recent decades the paper's readership has declined, and it has been beset by a series of ownership changes, staff reductions, and other controversies. In January 2018, the paper's staff voted to unionize and finalized their first union contract on October 16, 2019. The paper moved out of its historic downtown headquarters to a facility in El Segundo, California near Los Angeles International Airport in July 2018.

22. Mountain Time

The Mountain Time Zone of North America keeps time by subtracting seven hours from Coordinated Universal Time (UTC) when standard time (UTC−07:00) is in effect, and by subtracting six hours during daylight saving time (UTC−06:00). The clock time in this zone is based on the mean solar time at the 105th meridian west of the Greenwich Observatory. In the United States, the exact specification for the location of time zones and the dividing lines between zones is set forth in the Code of Federal Regulations at 49 CFR 71.

In the United States and Canada, this time zone is generically called Mountain Time (MT). Specifically, it is Mountain Standard Time (MST) when observing standard time, and Mountain Daylight Time (MDT) when observing daylight saving time. The term refers to the Rocky Mountains, which range from British Columbia to New Mexico. In Mexico, this time zone is known as the tiempo de la montaña or zona Pacífico ("Pacific Zone"). In the US and Canada, the Mountain Time Zone is to the east of the Pacific Time Zone and to the west of the Central Time Zone.

In some areas, starting in 2007, the local time changes from MST to MDT at 2 am MST to 3 am MDT on the second Sunday in March and returns at 2 am MDT to 1 am MST on the first Sunday in November.

Sonora in Mexico and most of Arizona in the United States do not observe daylight saving time, and during the spring, summer, and autumn months they are on the same time as Pacific Daylight Time. The Navajo Nation, most of which lies within Arizona but extends into Utah and New Mexico (which do observe DST), does observe DST, although the Hopi Reservation, as well as some Arizona state offices lying within the Navajo Nation, do not.

The largest city in the Mountain Time Zone is Phoenix, Arizona; the Phoenix metropolitan area is the largest metropolitan area in the zone.


23. Mumbai Time

Mumbai is a city in India with a population of 12691836 people. Mumbai lies in Longitude 72.88 and Latitude 72.88. Mumbai follows Indian Standard Time with an UTC offset of UTC+5:30. Mumbai does not follow daylight saving time.The Mumbai Time Zone Converter helps you to convert Mumbai time to local time in other time zones. The General Time Zone Converter converts from any Time Zone to any other Time zone which supports Mumbai time zone as well.

24. Nepal Time

Nepal Standard Time (NPT) is the time zone for Nepal.With a time offset from Coordinated Universal Time (UTC) of UTC+05:45 all over Nepal,it is one of only three time zones with a 45-minute offset from UTC.

NPT is an approximation of Kathmandu mean time, which is 5:41:16 ahead of UTC. The standard meridian passes through the peak of Gaurishankar mountain about 100 kilometres (62 mi) east of Kathmandu.

Nepal used local solar time until 1920, in Kathmandu UTC+05:41:16. In 1920, Nepal adopted Indian Standard Time, UTC+05:30. In 1986 Nepal advanced their clocks by 15 minutes, giving them a time zone of UTC+05:45.


25. New York Time

The state of New York uses the Eastern Time Zone (UTC-05:00) with daylight saving time (UTC-04:00). Because the largest city in the state, New York City, is the largest city in the United States, and because the Eastern Time Zone is used in the nation's capital, Washington, D.C., in addition to the fact that a majority of the nation's population is in that time zone, Eastern Time is the most commonly used time zone for television scheduling. Therefore, if a program airs at 7:00 PM Eastern Time, the network will usually advertise it by saying "Tonight at 7, 6 Central", or just "Tonight at 7".

26. Pakistan Time

Pakistan Standard Time is UTC+05:00 hours ahead of Coordinated Universal Time. The time zone is in use during standard time in Asia.

Pakistan had been following UTC+05:30 since 1907 (during the British Raj) and continued using it after independence in 1947. On 15 September 1951, following the findings of mathematician Mahmood Anwar, two time zones were introduced. Karachi Time (KART) was introduced in West Pakistan by adjusting 30 minutes off UTC+05:30 to UTC+05:00, while Dacca Time (DACT) was introduced in East Pakistan by subtracting 30 minutes off UTC+06:30 to UTC+06:00. The changes were made effective on 30, September 1951. PKT is measured in Gilgit, near the village of Naltar. In 1971, Karachi Time was renamed to Pakistan Standard Time.


27. New Delhi Time

New Delhi is a city in India. Indian Standard time (IST) is the time zone observed throughout India, with a time offset of UTC+05:30. India does not observe daylight saving time or other seasonal adjustments. In military and aviation time IST is designated E* ("Echo-Star").It is indicated as Asia/Kolkata in the IANA time zone database.

Indian Standard Time is calculated on the basis of 82.5°E longitude in the city of Mirzapur, Uttar Pradesh, which is situated approximately on the corresponding longitude reference line.

28. Pacific Daylight Time

Pacific Daylight Time is seven hours behind the Coordinated Universal Time standard, written as an offset of UTC - 7:00. That means to find the standard time in the zone you must subtract seven hours from Coordinated Universal Time.

Territories observing the time zone are primarily in North America. It runs through several U.S. states, including California, Idaho, Nevada, Oregon, and Washington. It also passes through Canada in the North, and Mexico in the South.

Depending on where the time zone is being referenced, it may be called one of these additional names:

1. Pacific Daylight Saving Time or PDST

2. North American Pacific Daylight Time or NAPDT

3. Heure Avancée du Pacifique or HAP (in French)

In many of the areas where this time zone is used, during the fall to winter months Pacific Standard Time, or PST, is observed, and then during Daylight Saving (spring to summer months) Pacific Daylight Time or PDT is used.


29. Philippines Manila Time

Philippine Standard Time (PST or PhST; Filipino: Pamantayang Oras ng Pilipinas), also known as Philippine Time (PHT), is the official name for the time zone used in the Philippines. The country only uses one time zone, at an offset of UTC+08:00, but has used daylight saving time for brief periods in the 20th century.

Geographically, the Philippines lies within 116°40′ and 126°34′ east of the Prime Meridian, and is physically located within the UTC+08:00 time zone. Philippine Standard Time is maintained by the Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA). The Philippines shares the same time zone with China, Taiwan, Hong Kong, Macau, Malaysia, Singapore, Western Australia, Brunei, Irkutsk, Central Indonesia, and most of Mongolia.

30. Phoenix Time

Phoenix, Arizona's time zone is Mountain Standard Time (MST). In the Greater Phoenix area we never change our clocks, since Arizona does not participate in Daylight Saving Time. Arizona is in the Mountain Time Zone and most of the state (with exceptions noted below) remains in Mountain Standard Time (MST) all year. Thus, during daylight saving time, from March to November, most of Arizona has the same time as the Pacific Time Zone.

Unlike most of the United States, Arizona does not observe daylight saving time (DST), with the exception of the Navajo Nation, which does observe DST. The Hopi Reservation, which is not part of the Navajo Nation but is geographically surrounded by it, does not observe DST.

Example:- When daylight saving is not active, the time in Phoenix and Denver is the same (Mountain Standard Time), and both are one hour ahead of San Diego (Pacific Standard Time).

When daylight saving is active, the time in Phoenix (Mountain Standard Time) and San Diego (Pacific Daylight Time) is the same, and both are one hour behind Denver (Mountain Daylight Time).


31. Pacific Time

The Pacific Time Zone (PT) is a time zone encompassing parts of western Canada, the western United States, and western Mexico. Places in this zone observe standard time by subtracting eight hours from Coordinated Universal Time (UTC−08:00). During daylight saving time, a time offset of UTC−07:00 is used.

In the United States and Canada, this time zone is generically called the "Pacific Time Zone". Specifically, time in this zone is referred to as "Pacific Standard Time" (PST) when standard time is being observed (early November to mid-March), and "Pacific Daylight Time" (PDT) when daylight saving time (mid-March to early November) is being observed. In Mexico, the corresponding time zone is known as the Zona Noroeste (Northwest Zone) and observes the same daylight saving schedule as the U.S. and Canada. The largest city in the Pacific Time Zone is Los Angeles, whose metropolitan area is also the largest in the zone.

The zone is two hours ahead of the Hawaii–Aleutian Time Zone, one hour ahead of the Alaska Time Zone, one hour behind the Mountain Time Zone, two hours behind the Central Time Zone, three hours behind the Eastern Time Zone, and four hours behind the Atlantic Time Zone.

32. Seoul Time

South Korea has one time zone, Korea Standard Time (UTC+09:00), which is abbreviated KST. South Korea currently does not observe daylight saving time, but experimented with it during the 1988 Summer Olympics in Seoul.In 1434, inventor Jang Yeong-sil developed Korea's first automatic water clock, which King Sejong adapted as Korea's standard timekeeper. It is likely that Koreans used water clocks to keep time prior to this invention, but no concrete records of them exist. In 1437, Jang Yeong-sil, with Jeong Cho, created a bowl-shaped sundial called the angbu ilgu , which King Sejong had placed in public so anyone could use it.

Geographically, the western parts of Korea, including the South Korean capital city, Seoul, is UTC+08:00. In 1908, the Korean Empire adopted a standard time that was 8 1⁄2 hours ahead of GMT, UTC+08:30. In 1912, during the Japanese occupation of Korea, the Governor-General of Korea changed standard time to UTC+09:00 to align with Japan Standard Time. However, in 1954, the South Korean government under President Syngman Rhee reverted the standard time to UTC+08:30. Then in 1961, under the military government of President Park Chung-hee, the standard time was changed back to UTC+09:00 once again.

In order to accommodate American television viewers, South Korea observed daylight saving time (UTC+10:00) when Seoul hosted the 1988 Summer Olympics. The one-hour time change meant that many daytime events could be broadcast live from South Korea when it was prime time on the U.S. east coast.

North Korea also uses Korea Standard Time. From August 2015 to May 2018, North Korea changed its time zone to UTC+08:30, a time zone known as Pyongyang Standard Time, but the change was reverted to promote Korean unity.


33. Singapore Time

Singapore Standard Time (SST), also known as Singapore Time (SGT), is used in Singapore and is 8 hours ahead of UTC (UTC+08:00). Singapore does not currently observe daylight saving time.

Daylight saving time in Singapore:-

Although Singapore does not currently observe daylight saving time in the traditional sense due to its tropical location, a form of daylight saving time, using a 20-minute offset, was introduced on an annual basis by the Legislative Council of the Straits Settlements in 1933.

On 2 July 1920, a bill was intituled as Daylight Saving Ordinance, 1920. It is to introduce a 30-minutes offset or seven and a half hour in advance of Greenwich mean time. The bill was read for the first time on 5 July 1920 but was later abandoned.

In 1932, Sir Arnold Percy Robinson raised the idea of 20-minute offset after an earlier attempt was abandoned in 1920 which was first proposed by Sir Laurence Guillemard for a 30-minute offset. On 26 September 1932, a bill was intituled as Daylight Saving Ordinance, 1932. The Ordinance was passed at a meeting of the Legislative Council held on 5 December 1932 and approved by Sir Cecil Clementi (Governor) on 15 December 1932.

Between 1934 and 1935, the Daylight Saving Ordinance, 1932 was extended throughout both years by Gazette Notifications. The 20-minute offset was formally adopted as standard time in Singapore in 1936,[8] and on 1 September 1941 the offset was increased to 30 minutes, the same as the 1920 proposal.

34. South Korea Time

South Korea has one time zone, Korea Standard Time (UTC+09:00), which is abbreviated KST. South Korea currently does not observe daylight saving time, but experimented with it during the 1988 Summer Olympics in Seoul.In 1434, inventor Jang Yeong-sil developed Korea's first automatic water clock, which King Sejong adapted as Korea's standard timekeeper. It is likely that Koreans used water clocks to keep time prior to this invention, but no concrete records of them exist. In 1437, Jang Yeong-sil, with Jeong Cho, created a bowl-shaped sundial called the angbu ilgu , which King Sejong had placed in public so anyone could use it.

Geographically, the western parts of Korea, including the South Korean capital city, Seoul, is UTC+08:00. In 1908, the Korean Empire adopted a standard time that was 8 1⁄2 hours ahead of GMT, UTC+08:30. In 1912, during the Japanese occupation of Korea, the Governor-General of Korea changed standard time to UTC+09:00 to align with Japan Standard Time. However, in 1954, the South Korean government under President Syngman Rhee reverted the standard time to UTC+08:30. Then in 1961, under the military government of President Park Chung-hee, the standard time was changed back to UTC+09:00 once again.

In order to accommodate American television viewers, South Korea observed daylight saving time (UTC+10:00) when Seoul hosted the 1988 Summer Olympics. The one-hour time change meant that many daytime events could be broadcast live from South Korea when it was prime time on the U.S. east coast.

North Korea also uses Korea Standard Time. From August 2015 to May 2018, North Korea changed its time zone to UTC+08:30, a time zone known as Pyongyang Standard Time, but the change was reverted to promote Korean unity.


35. Taiwan Time

National Standard Time is the official time zone in Taiwan defined by an UTC offset of +08:00. This standard is also known as Taiwan Time , Taipei Time and historically as Chungyuan Standard Time until the early 2000s.The first time zone standard in Taiwan was enforced on 1 January 1896, the second year of Taiwan under Japanese rule. The standard was called Western Standard Time with time offset of UTC+08:00, based on 120°E longitude. On 1 October 1937, the Western Standard Time zone was abolished and the Central Standard Time , with time offset of UTC+09:00, was enforced in the entire country of Japan including Taiwan. This time was used until the end of the Second World War. On 21 September 1945, the Governor-General of Taiwan announced that the order issued in 1937 was revoked. Time Memorial Day was observed every 10 June from 1921 to 1941, which led to an increase in the observance of an official time.

After the war's end, Taiwan was annexed to the five time zones system of the Republic of China and was classified in the "Chungyuan Standard Time" with time offset of UTC+08:00. After the Chinese Civil War in 1949, the Government of the Republic of China retreated to Taiwan and lost nearly all the territory in mainland China. Since then, the five time zones system was no longer implemented except the Chungyuan Standard Time in Taiwan. Due to the fact that the term "Chungyuan" (Zhongyuan) refers to the Central Plain of China, the government gradually phased out the name in favor of "National Standard Time", though some radio channels continued using "Chungyuan", most notably the Broadcasting Corporation of China until 2007. Other alternatives include "Taiwan Standard Time" , "Taipei Time" and "Formosan Time" .

Daylight saving time was implemented in Taiwan after the Second World War on the summer of 1946–1961, 1974, 1975, 1979.

In October 2017, a petition took place to change the offset to UTC+09:00, which was responded by an assessment of potential impact by the government.

36. Thailand Time

Thailand follows UTC+07:00, which is 7 hours ahead of UTC. The local mean time in Bangkok was originally UTC+06:42:04. Thailand used this local mean time until 1920, when it changed to Indochina Time, UTC+07:00; ICT is used all year round as Thailand does not observe daylight saving time. Thailand shares the same time zone with Vietnam, Cambodia, Laos, Christmas Island, and Western Indonesia.

Prior to 1 January 1901 locations in Siam with an astronomical observatory would adopt local mean time based on the observatory's geographic position. Chiang Mai Province and two other provinces each had an observatory, hence, each province had its own distinct local mean time, with minutes of difference between the three locations.

On 1 April 1920 the mean time of the 105th meridian east (passing through Ubon Ratchathani Province) was adopted by Siam as the new standard time. The mean time of the 105th meridian is 7 hours ahead of Greenwich Mean Time (i.e., local mean time at the Greenwich Royal Observatory).

In July 2001, Thailand announced its intention of moving its time forward one hour, to align with both Malaysia and Singapore and more importantly with China and Hong Kong, i.e., UTC+08:00. This was met with much criticism and resistance and the plan was withdrawn.


37. Tokyo Time

Tokyo is a city in Japan.Japan Standard Time abbreviated as JST, is the standard time zone in Japan, 9 hours ahead of UTC (i.e. it is UTC+09:00). There is no daylight saving time, though its introduction has been debated several times. During World War II, it was often called Tokyo Standard Time.

Daylight saving time in Japan:- From 1948 to 1952, Japan observed daylight saving time (DST) between May and September every year. The United States imposed this policy as part of the Allied occupation of Japan. In 1952, three weeks before the occupation ended, the Japanese government, which had been granted increased powers, abolished daylight saving time, and the Allied occupation authorities did not interfere. Since then, DST has never been officially implemented nationwide in Japan.

Starting in the late 1990s, a movement to reinstate DST in Japan gained some popularity, aiming at saving energy and increasing recreational time. The Hokkaido region is particularly in favor of this movement because daylight starts as early as 03:30 (in standard time) there in summer due to its high latitude and its location near the eastern edge of the time zone, with much of the region's solar time actually closer to UTC+10:00. Because of this, the sun sets barely after 19:00 in much of the eastern part of the country (in Tokyo, the latest sunset of the entire year is 19:01, from June 26 to July 1, despite being at 35°41'N latitude). After 2000, a few local governments and commerce departments promoted unmandated hour-earlier work schedule experiments during the summer without officially resetting clocks.

The Council on Economic and Fiscal Policy of the Cabinet Office is expected (written October 2013) to propose that the Japanese government begin studying DST in an attempt to help combat global warming. Japanese Prime Minister Shinzō Abe made a significant effort to introduce daylight saving time, but was ultimately unsuccessful. However, it is not clear that DST would conserve energy in Japan. A 2007 simulation estimated that introducing DST to Japan would increase energy use in Osaka residences by 0.13%, with a 0.02% saving due to lighting more than outweighed by a 0.15% increase due to cooling costs; the simulation did not examine non-residential buildings.

38. US Time

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. The time zone boundaries and DST observance are regulated by the Department of Transportation. Official and highly precise timekeeping services (clocks) are provided by two federal agencies: the National Institute of Standards and Technology (NIST) (an agency of the Department of Commerce); 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.

It is the combination of the time zone and daylight saving rules, along with the timekeeping services, which determines the legal civil time for any U.S. location at any moment.

In 1960, the International Radio Consultative Committee formalized the concept of Coordinated Universal Time (UTC), which became the new international civil time standard. UTC is, within about 1 second, mean solar time at 0°. UTC does not observe daylight saving time.

For most purposes, UTC is considered interchangeable with GMT, but GMT is no longer precisely defined by the scientific community. UTC is one of several closely related successors to GMT.


39. United Kingdom Time

The United Kingdom uses Greenwich Mean Time or Western European Time (UTC) and British Summer Time or Western European Summer Time (UTC+01:00).

Until the advent of the railways, the United Kingdom used Local Mean Time. Greenwich Mean Time was adopted first by the Great Western Railway in 1840 and a few others followed suit in the following years. In 1847 it was adopted by the Railway Clearing House, and by almost all railway companies by the following year. It was from this initiative that the term "railway time" was derived.

It was gradually adopted for other purposes, but a legal case in 1858 held "local mean time" to be the official time.On 14 May 1880, a letter signed by 'Clerk to Justices' appeared in 'The Times', stating that 'Greenwich time is now kept almost throughout England, but it appears that Greenwich time is not legal time. This was changed later in 1880, when Greenwich Mean Time was legally adopted throughout the island of Great Britain under the Statutes (Definition of Time) Act 1880 (43 & 44 Vict.). GMT was adopted on the Isle of Man in 1883, Jersey in 1898 and Guernsey in 1913. Ireland adopted GMT in 1916, supplanting Dublin Mean Time.

Daylight saving time was introduced by the Summer Time Act 1916 (6 & 7 Geo. V), which was implemented in 1916 as GMT plus one hour and Dublin Mean Time plus one hour. The length of DST could be extended by Order in Council, and was extended for the duration of World War I. For 1916, DST extended from 21 May to 1 October, with transitions at 02:00 standard time. On 1 October 1916, Greenwich Mean Time was introduced to Ireland.

At the beginning of the 20th century, Sandringham Time (UTC+00:30) was used by the royal household. This practice was halted by King Edward VIII, in an effort to reduce confusions over time.

The United Kingdom experimentally adopted Central European Time by maintaining Summer Time throughout the year from 1968 to 1971.In a House of Lords debate, Richard Butler, 17th Viscount Mountgarret said that the change was welcomed at the time, but the experiment was eventually halted after a debate in 1971, in which the outcome might have been influenced by a major accident on the morning of the debate. Proposals to adopt CET have been raised by various politicians over the years, including a proposal in 2011 to conduct an analysis of the costs and benefits.

The dates of British Summer Time are the subject of the Summer Time Act 1972. From 1972 to 1980, the day following the 3rd Saturday in March was the start of British Summer Time (unless that day was Easter Sunday, in which case BST began a week earlier), with the day following the 4th Sunday in October being the end of British Summer Time. From 1981 to 2001, the dates were set in line with various European Directives. Since 2002 the Act has specified the last Sunday in March as the start of British Summer Time with the last Sunday in October being end of British Summer Time.

Since 1998 the start and end date are the same in both the United Kingdom and the European Union.

40. UTC Time

Coordinated Universal Time or UTC is the primary time standard by which the world regulates clocks and time. It is within about 1 second of mean solar time at 0° longitude, and is not adjusted for daylight saving time. It is effectively a successor to Greenwich Mean Time (GMT).

The coordination of time and frequency transmissions around the world began on 1 January 1960. UTC was first officially adopted as CCIR Recommendation 374, Standard-Frequency and Time-Signal Emissions, in 1963, but the official abbreviation of UTC and the official English name of Coordinated Universal Time (along with the French equivalent) were not adopted until 1967.

The system has been adjusted several times, including a brief period where the time-coordination radio signals broadcast both UTC and "Stepped Atomic Time (SAT)" before a new UTC was adopted in 1970 and implemented in 1972. This change also adopted leap seconds to simplify future adjustments. This CCIR Recommendation 460 "stated that (a) carrier frequencies and time intervals should be maintained constant and should correspond to the definition of the SI second; (b) step adjustments, when necessary, should be exactly 1 s to maintain approximate agreement with Universal Time (UT); and (c) standard signals should contain information on the difference between UTC and UT."

A number of proposals have been made to replace UTC with a new system that would eliminate leap seconds. A decision whether to remove them altogether has been deferred until 2023.

The current version of UTC is defined by International Telecommunication Union Recommendation (ITU-R TF.460-6), Standard-frequency and time-signal emissions, and is based on International Atomic Time (TAI) with leap seconds added at irregular intervals to compensate for the slowing of the Earth's rotation. Leap seconds are inserted as necessary to keep UTC within 0.9 second of the UT1 variant of universal time. See the "Current number of leap seconds" section for the number of leap seconds inserted to date.