The Thai solar calendar (, , "solar calendar") was adopted by King

Chulalongkorn Chulalongkorn (20 September 1853 – 23 October 1910), posthumously honoured as King Chulalongkorn the Great, was the fifth king of Siam from the Chakri dynasty, titled Rama V. Chulalongkorn's reign from 1868 until his death in 1910 was cha ...

(Rama V) in 1888 CE as the Siamese version of the

Gregorian calendar The Gregorian calendar is the calendar used in most parts of the world. It went into effect in October 1582 following the papal bull issued by Pope Gregory XIII, which introduced it as a modification of, and replacement for, the Julian cale ...

, replacing the Thai lunar calendar as the legal Thai calendar (though the latter is still also used, especially for traditional and religious events). Years are now counted in the Buddhist Era (B.E.): (lit. ' era of the Shaka

Buddha Siddhartha Gautama, most commonly referred to as the Buddha (),* * * was a wandering ascetic and religious teacher who lived in South Asia during the 6th or 5th century BCE and founded Buddhism. According to Buddhist legends, he was ...

') which is 543 years ahead of the Gregorian calendar.

Years

The

Siam Thailand, officially the Kingdom of Thailand and historically known as Siam (the official name until 1939), is a country in Southeast Asia on the Mainland Southeast Asia, Indochinese Peninsula. With a population of almost 66 million, it spa ...

ese generally used two calendars, a ''sacred'' and a ''popular'' ( ''vulgar'' in the classical sense). The vulgar or minor era (, ''chula sakarat'') was thought to have been instituted when the worship of Gautama was first introduced, and corresponds to the traditional Burmese calendar (abbreviated ME or BE, the latter not to be confused with the abbreviation for the Buddhist Era, which is the sacred era.)

Rattanakosin Era

King Chulalongkorn decreed a change in vulgar reckoning to the '' Rattanakosin Era'' (, ''Rattanakosin Sok'' abbreviated ร.ศ. and R.S.) in 1889 CE. The

epoch (reference date) In chronology and periodization, an epoch or reference epoch is an instant in time chosen as the origin of a particular calendar era. The "epoch" serves as a reference point from which time is measured. The moment of epoch is usually decided by ...

for Year 1 was 6 April 1782 with the accession of

Rama I Phutthayotfa Chulalok (born Thongduang; 20 March 1737 – 7 September 1809), also known by his regnal name Rama I, was the founder of the Rattanakosin Kingdom (now Thailand) and the first King of Siam from the reigning Chakri dynasty. He asc ...

, the foundation of the

Chakri dynasty The Chakri dynasty is the current reigning dynasty of the Thailand, Kingdom of Thailand. The head of the house is the Monarchy of Thailand, king, who is head of state. The family has ruled Thailand since the founding of the Rattanakosin era and ...

, and the founding of Bangkok (Rattanakosin) as capital. To convert years in R.S. to the Common Era, add 1781 for dates from 6 April to December, and 1782 for dates from January to 5 April.

Buddhist Era

In Thailand the sacred, or Buddhist Era, is reckoned to have an epochal year 0 from 11 March 543 BC, believed to be the date of the death of

Gautama Buddha Siddhartha Gautama, most commonly referred to as the Buddha (),* * * was a śramaṇa, wandering ascetic and religious teacher who lived in South Asia during the 6th or 5th century BCE and founded Buddhism. According to Buddhist lege ...

. King

Vajiravudh Vajiravudh (1 January 188126 November 1925) was the sixth Monarchy of Thailand, king of Siam from the Chakri dynasty, titled Rama VI. He reigned from 1910 until his death in 1925. King Vajiravudh is best known for his efforts to create and pro ...

(Rama VI) changed year counting to this Buddhist Era (abbreviated BE) and moved the start of the year back to 1 April in 2455 BE, 1912 CE. As there is no longer any reference to a vulgar or popular era, the Common Era may be presumed to have taken the place of the former.

New year

New Year, the time at which a new

calendar year A calendar year begins on the New Year's Day of the given calendar system and ends on the day before the following New Year's Day, and thus consists of a whole number of days. The Gregorian calendar year, which is in use as civil calendar in ...

begins and the calendar's year count is incremented, originally coincided with the date calculated for Songkran, when the Sun transits the constellation of Aries, the first

astrological sign In Western astrology, astrological signs are the twelve 30-degree sectors that make up ecliptic, Earth's 360-degree orbit around the Sun. The signs enumerate from the first day of spring, known as the First Point of Aries, which is the Equinox (c ...

in the

Zodiac The zodiac is a belt-shaped region of the sky that extends approximately 8° north and south celestial latitude of the ecliptic – the apparent path of the Sun across the celestial sphere over the course of the year. Within this zodiac ...

as reckoned by sidereal astrology: thus the year commenced on 11 April 1822. As previously noted, Rama VI moved the start of the year back to 1 April in 2455 BE, 1912 CE, so that 130 R.S. only lasted for 356 days from 11 April 1911 to 31 March 1912. On 6 September 1940, Prime Minister Phibunsongkhram decreed 1 January 1941 as the start of the year 2484 BE, so year 2483 BE had only nine months running from 1 April to 31 December 1940. To convert dates from 1 January to 31 March prior to that year, the number to add or subtract is 542; otherwise, it is 543. Example: Today, both the

Common Era Common Era (CE) and Before the Common Era (BCE) are year notations for the Gregorian calendar (and its predecessor, the Julian calendar), the world's most widely used calendar era. Common Era and Before the Common Era are alternatives to the ...

New Year's Day (1 January) and the traditional Thai New Year (, ''Songkran'') celebrations (13–15 April) are public holidays in Thailand. In the traditional Thai calendar, the change to the next

Chinese zodiac The Chinese zodiac is a traditional classification scheme based on the Chinese calendar that assigns an animal and its reputed attributes to each year in a repeating twelve-year (or duodenary) cycle. The zodiac is very important in traditional ...

al animal occurs at Songkran (now fixed at 13 April.) For

Thai Chinese Thai Chinese (also known as Chinese Thais, Sino-Thais) are persons of Chinese people, Chinese descent in Thailand. Thai Chinese are the largest mixed group in the country and the largest overseas Chinese community in the world with a popul ...

communities in Thailand, however, the

Chinese calendar The traditional Chinese calendar, dating back to the Han dynasty, is a lunisolar calendar that blends solar, lunar, and other cycles for social and agricultural purposes. While modern China primarily uses the Gregorian calendar for officia ...

determines the day that a

Chinese New Year Chinese New Year, or the Spring Festival (see also #Names, § Names), is a festival that celebrates the beginning of a New Year, new year on the traditional lunisolar calendar, lunisolar Chinese calendar. It is one of the most important holi ...

begins, and assumes the name of the next animal in the twelve-year animal cycle.

Months

Names of the months derive from Hindu astrology names for the signs of the zodiac. Thirty-day-month names end in ''-ayon'' (), from Sanskrit root ''āyana'', meaning the arrival of; 31-day-month names end in ''-akhom'' (), from Sanskrit ''āgama'' (cognate to English "come") that also means the arrival of. February's name ends in ''-aphan'' (), from Sanskrit ''bandha'', meaning "fettered" or "bound". The day added to February in a solar

leap year A leap year (also known as an intercalary year or bissextile year) is a calendar year that contains an additional day (or, in the case of a lunisolar calendar, a month) compared to a common year. The 366th day (or 13th month) is added to keep t ...

is ''Athikasurathin'' (, respelled to aid pronunciation () from Sanskrit ''adhika'': "additional"; and ''sura'': "move".Thai2english.com
, dictionary

Days

Problems

Using Buddhist era could easily cause confusion between itself and Anno Domini in the historical context. For example, Anno Domini , and Buddhist year (which corresponds to AD ). Two-digit year numbering could cause even more confusion. Another problem is the counting of the Buddhist era, which has changed several times in the past, including the inclusion of year 0, and the change of New Year's Day from April to January in 1941, has caused confusion in historical context as well. For example, many Thai people regard the establishment of the

Ayutthaya Kingdom The Ayutthaya Kingdom or the Empire of Ayutthaya was a Thai people, Thai kingdom that existed in Southeast Asia from 1351 to 1767, centered around the city of Phra Nakhon Si Ayutthaya (city), Ayutthaya, in Siam, or present-day Thailand. Europe ...

to be in 1350, which is direct conversion from Buddhist era 1893, while the actual date is 1351. In computer programming, using the Buddhist era has sometimes caused the computer programs to void the license immediately, as the input values of the Buddhist era would exceed the expiration date for the program. Some users report that dates appear in future dates, due to the input data being the Buddhist era, while the computer is designed to accept

Anno Domini The terms (AD) and before Christ (BC) are used when designating years in the Gregorian calendar, Gregorian and Julian calendar, Julian calendars. The term is Medieval Latin and means "in the year of the Lord" but is often presented using "o ...

References

* Eade, John Christopher. 1995. ''The Calendrical Systems of Mainland South-East Asia''. Handbuch der Orientalistik: Dritte Abteilung, Südostasien 9. Leiden and New York: E. J. Brill. * na Nakorn, Bleung (comp.). 971 นายเปลื้อง ณ นคร ผู้รวบรวม ปทานุกรมนักเรียน ไทยวัฒนาพานิช กทม. Student's Handbook. Bangkok: Thai Wattana Panit, 2514. * Sethaputra, So. 1999. ''New Model English – Thai Dictionary''. rung Thep Maha Nakhon?: Thai Watthana Phanit? * Thai calendar for August 2004.
Web dictionary Thai-English English-Thai

External links

Thai Lunar/Solar Calendar (BE.2300–2584)
(Thai Language) {{DEFAULTSORT:Thai Solar Calendar

Solar calendar A solar calendar is a calendar whose dates indicates the season or almost equivalently the apparent position of the Sun relative to the stars. The Gregorian calendar, widely accepted as a standard in the world, is an example of a solar calendar ...

Solar calendars Specific calendars Modified Gregorian calendars