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Thai solar calendar

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Title: Thai solar calendar  
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Subject: Sarit Thanarat, Thailand, Buddhist calendar, 123, Time in Thailand
Collection: Modified Gregorian Calendars, Solar Calendars, Specific Calendars, Thai Culture, Time in Thailand
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Thai solar calendar

The Thai solar calendar, Suriyakhati (Thai: สุริยคติ) was adopted by King Chulalongkorn (Rama V) in AD 1888 as the Siamese version of the Gregorian calendar. It is the legal calendar in Thailand, though Thai lunar calendar dates continue in use. Years are now counted in the Buddhist Era (BE: พ.ศ. พุทธศักราช, pútthasàkkàrât) which began 543 years before the Christian Era ( ค.ศ. คริสต์ศักราช, krítsàkkàrât). As a convenience, calendars typically include the year AD in both Arabic and Thai numerals.

August ๒๕๔๗ Thai numerals = 2547 BE, AD 2004 Chinese 二〇〇四年
August 2547 BE/AD 2004


  • Calendar 1
  • Birthdays 2
  • Years 3
    • Rattanakosin Era 3.1
    • Buddhist Era 3.2
    • New year 3.3
  • Months 4
  • Weeks 5
    • Weekends and holidays 5.1
  • See also 6
  • Notes 7
  • References 8
  • External links 9


Thai (left) and Chinese (right) holy days.


Mundane astrology figures prominently in Thai culture, so modern Thai birth certificates include lunar calendar dates, and the appropriate Chinese calendar zodiacal animal year-name for both Thai Hora (โหราศาสตร์, ho-ra-sat) and Chinese astrology. Thai birth certificates record the date, month and time of birth, followed by the day of the week, lunar date, and the applicable zodiac animal name. Thai traditionally reckon age by the 12-year animal-cycle names, with the twelfth and sixtieth anniversaries being of special significance; but the official calendar determines age at law.

For instance, 12 August 2004 was observed without regard to the lunar date as Queen Sirikit's birthday, a public holiday also observed as Thai Mothers' Day. Her zodiacal animal is the Monkey and her traditionally significant sixtieth anniversary year was 1992. Born on a Friday, her auspicious birthday colour is blue. Thai auspicious colours of the day are given in the table of weekdays, followed below it by a link to the Buddha images for each day of the week.


The Siamese generally used two calendars, a sacred and a popular (vulgar in the classical sense). The vulgar or minor era (จุลศักราช, chula sakarat) was thought to have been instituted when the worship of Gautama was first introduced,[1] [2] 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 (abbreviated RE) (รัตนโกสินทรศก, Rattanakosin Sok abbreviated ร.ศ. and R.S.) The epoch (reference date) for Year 1 was 6 April 1782 with the accession of Rama I, the foundation of the Chakri Dynasty, and the founding of Bangkok (Rattanakosin) as capital in 106 RE, AD 1888.

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. King Vajiravudh (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, AD 1912. 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 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 the Zodiac as reckoned by sidereal astrology: thus the year commenced on 11 April 1822.[1] As previously noted, Rama VI moved the start of the year back to 1 April in 2455 BE, AD 1912.

On 6 September 1940, Prime Minister Phibunsongkhram decreed[3] 1 January 1941 as the start of the year 2484 BE, so year 2483 BE had only nine months. 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:

Month 1–3 4–6 7–9 10–12 1–3 4–6 7–9 10–12 1–3 4–6 7–9 10–12 1–3 4–6 7–9 10–12
AD 1939 1940 1941 1942
BE 2481 2482 2483 2484 2485
Thai Month 10-12 1-3 4–6 7–9 10-12 1-3 4–6 7–9 1-3 4-6 7-9 10-12 1-3 4-6 7-9 10-12

Today, both the Common Era New Year's Day (1 January) and the traditional Thai New Year (สงกรานต์, Songkran) celebrations (13–15 April) are public holidays in Thailand. In the traditional Thai calendar, the change to the next Chinese zodiacal animal occurs at Songkran (now fixed at 13 April.)[4] For Thai Chinese communities in Thailand, however, the Chinese calendar determines the day that a Chinese New Year begins, and assumes the name of the next animal in the twelve-year animal cycle.


Names of the months derive from Hindu astrology names for the signs of the zodiac. Thirty-day-month names end in -ayon (-ายน), from Sanskrit root āyana : the arrival of; 31-day-month names end in -akhom (-าคม), from Sanskrit āgama (cognate to English "come") that also means the arrival of.

February's name ends in -phan (-พันธ์), from Sanskrit bandha : "fettered" or "bound". The day added to February in a solar leap year is Athikasuratin (อธิกสุรทิน, respelled to aid pronunciation (อะทิกะสุระทิน) from Sanskrit adhika : additional; sura : move).[5]

English name Thai name Abbr. Transcription Sanskrit word Zodiac sign
January มกราคม ม.ค. makarakhom, mokkarakhom makara "sea-monster" Capricorn
February กุมภาพันธ์ ก.พ. kumphaphan kumbha "pitcher, water-pot" Aquarius
March มีนาคม มี.ค. minakhom mīna "(a specific kind of) fish" Pisces
April เมษายน เม.ย. mesayon meṣa "ram" Aries
May พฤษภาคม พ.ค. phruetsaphakhom vṛṣabha "bull" Taurus
June มิถุนายน มิ.ย. mithunayon mithuna "a pair" Gemini
July กรกฎาคม ก.ค. karakadakhom karkaṭa "crab" Cancer
August สิงหาคม ส.ค. singhakhom sinha "lion" Leo
September กันยายน ก.ย. kanyayon kanyā "girl" Virgo
October ตุลาคม ต.ค. tulakhom tulā "balance" Libra
November พฤศจิกายน พ.ย. phruetsachikayon vṛścika "scorpion" Scorpio
December ธันวาคม ธ.ค. thanwakhom dhanu "bow, arc" Sagittarius


A week (สัปดาห์, sapda or สัปดาหะ, sapdaha from Sanskrit "seven") is a 7-day period beginning on Sunday and ending Saturday.[6]

Days of the week are named after the first seven of the nine Indian astrological Navagraha; i.e., the sun, moon, and five classical planets.

English name Thai name Transcription Color Sanskrit word Planet
Sunday วันอาทิตย์ wan athit red Aditya Sun
Monday วันจันทร์ wan chan yellow Chandra Moon
Tuesday วันอังคาร wan angkhan pink Angaraka Mars
Wednesday วันพุธ wan phut green Budha Mercury
Thursday วันพฤหัสบดี wan phruehatsabodi orange Brihaspati Jupiter
Friday วันศุกร์ wan suk blue Shukra Venus
Saturday วันเสาร์ wan sao purple Shani Saturn

Note: Colours are those considered auspicious for the given days of the week, that of Wednesday day being green and of Wednesday night, light green. Of Buddha images representing episodes (ปาง) from his life, there is one that represents a week and others for each day of the week: Monday has three options that are similar and Wednesday, entirely different ones for day and night.[7]

Thai representations of the planets in deity form are below:

Weekends and holidays

Saturdays and Sundays (Thai: เสาร์-อาทิตย์ sao athit) are observed as legal non-workdays (วันหยุดราชการ, wan yut ratchakan) and are generally shown on calendars in red, as are public holidays. Since 1996 and subject to declaration by the Cabinet of Thailand, public holidays that fall on weekends are followed by Substitution days (วันชดเชย, wan chot choei) generally shown in a lighter shade of red, as shown above for Monday, 2 August 2004. Buddhist feasts that are public holidays are calculated according to the Thai lunar calendar, so their dates change every year with respect to the solar calendar. Chinese New Year and other feasts observed by Thai Chinese vary with respect to both, as these are calculated according to the Chinese calendar.

See also


  1. ^ a b  
  2. ^  
  3. ^ พระราชบัญญัติปีปฏิทิน พุทธศักราช ๒๔๘๓ (PDF). Royal Gazette (in Thai) 57 (0 ก): 419. 1940-09-17. 
  4. ^ J.C. Eade. The calendrical systems of mainland southeast asia. E.J. Brill, Leiden. p. 22. George Coedes the change occurred at the beginning of the 5th lunar month originally a few days before Songkhran.
  5. ^, dictionary
  6. ^ Royal Institute Dictionary 1999
  7. ^ "Thai birth day colors and Buddha image". United States Muay Thai Association Inc. 16 October 2004. Retrieved 14 November 2009. An innovation of the Ayutthaya period. 


  • 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. ISBN 90-04-10437-2
  • na Nakorn, Bleung (comp.). [1971]. นายเปลื้อง ณ นคร ผู้รวบรวม ปทานุกรมนักเรียน ไทยวัฒนาพานิช กทม. Student's Handbook. Bangkok: Thai Wattana Panit, 2514.
  • Sethaputra, So. 1999. New Model English - Thai Dictionary. [Krung Thep Maha Nakhon?: Thai Watthana Phanit?]. ISBN 974-08-3253-9
  • Thai calendar for August 2004.
  • Web dictionary Thai-English English-Thai

External links

  • Thai Time by Anthony Diller
  • Thai Buddha Images for the Days of the Week
  • Thai Lunar/Solar Calendar (BE.2300-2584) (Thai Language)
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