Thai Dates and the Buddhist Era: Why Your Documents Say 2569

Published 19 October 2026 · By the Visit-Thailand editorial team · Editor: Terje Moy

Thailand counts years in the Buddhist Era (B.E.), which is 543 years ahead of the Western calendar: 2026 is B.E. 2569, and 2027 will be 2570. The months and days are the same as yours, and the Thai year starts on 1 January. To convert, subtract 543 from a Thai year, or add 543 to a Western one.

The Buddhist Era is the official count for Thai government documents, laws and newspapers, so you will meet it on receipts, leases, bank papers and many product labels. The difficulty is that Thailand uses both systems side by side, and a date such as 05/06/69 does not say which calendar it is in. This page shows how to tell them apart and where the mix-ups happen.

Converting a Thai year: add or subtract 543

The arithmetic is the whole trick. A Thai year minus 543 gives the Western year, and a Western year plus 543 gives the Thai one. Because the Thai year has started on 1 January since 1941, the conversion works for every date in modern documents.

The two-digit short form is where people slip. A form dated "18/11/69" is in November 2026, not 1969. Thai documents written by hand often use only the last two digits of the B.E. year, and some printed ones use Thai numerals, in which 2569 is written ๒๕๖๙.

Why the Thai year changed in 1941

The Buddhist Era has been Thailand's official count since the 1910s, when it replaced an older era for government use. At that time the Thai year began in April. The Calendar Year Act of B.E. 2483 (1940), published in the Royal Gazette on 17 September 1940, changed this. Section 4 says the calendar year runs for twelve months from 1 January to 31 December, that the year B.E. 2483 ends on 31 December, and that B.E. 2484 begins on 1 January. That first January New Year fell on Wednesday 1 January 1941.

The result is a short year: B.E. 2483 lasted only nine months, from April to December 1940. It also means that for dates in January, February and March before 1941, the difference is 542, not 543. That matters only if you read old land deeds, family records or history books; for anything from 1941 onwards, 543 is always right.

The Buddhist Era is a count of years, not a different calendar of months. Buddhist holy days such as Makha Bucha follow the lunar calendar and move from year to year; our page on Buddhist holy days in Thailand explains those dates and the alcohol ban that comes with them, and the public holidays guide lists what closes.

Expiry dates on food: check the year before you panic

This is where most visitors meet the problem. A yogurt that seems to have expired in 1969, or will last until 2569, is just labeled in the other calendar. Thailand's food labeling rule, Ministry of Public Health Notification No. 450 (B.E. 2567, 2024), says what the date must show but not which era it must use:

• Food that keeps for 90 days or less must show day, month and year; longer-lasting food may show month and year only.
• The date comes with the words "consume before" (ควรบริโภคก่อน, best before) or "expiry date" (หมดอายุ).
• The month may be written as a number or in letters, and Thai and English may appear together.

So a pack can say "EXP 03/2027" or "หมดอายุ 03/2570", and both mean March 2027. Imported products often carry the Western year; Thai-made products may use either. If the year is around 2569 to 2575, subtract 543. If you cannot tell from the year, the order on Thai food labels is day, month, year, never month first.

Medicine packs and pharmacy labels

Medicine boxes and blister packs carry production and expiry dates too, often marked MFG and EXP. We have not found a published Thai rule that fixes the era for medicine labels, so apply the same check as for food: a year that starts with 25 is Buddhist Era.

If a date looks wrong, ask the pharmacist before you buy; any reputable shop will swap an old pack. Our article on what you can buy over the counter at Thai pharmacies covers checking packaging, and the guide to late-night pharmacies helps if you need one after dark.

Contracts, receipts and the names of Thai laws

Official Thai documents use the Buddhist Era: tax invoices, bank statements, house registration books, leases and work papers. A one-year lease signed in B.E. 2569 that "ends in 2570" ends in 2027. When a document matters, write the Western date next to the Thai one on your copy, and check that both parties read it the same way. Our guide to renting a condo covers what else to check before you sign.

Thai laws are named after their B.E. year. The Personal Name Act B.E. 2505, which governs Thai surnames, is from 1962; Notification No. 450 B.E. 2567 is from 2024. When a page on this site cites a law "B.E. 25xx", subtract 543 to place it in time. Many English translations of Thai laws keep the B.E. year in the title, so search for both forms.

Visa stamps, forms and the day count

When you work out how long you may stay, the date that counts is the one in your passport stamp or e-visa. Read the year on it carefully: if it starts with 25, subtract 543 before you count. Check each document on its own: a stamp, a receipt and a Thai-language form from the same office do not necessarily use the same year count.

Our visa-free stay calculator and the 90-day report date calculator work in Western dates, so convert first. A mistake of one year is obvious, but a misread day and month (5 June versus 6 May) is easy to make; Thai documents put the day first.

Thai month names and their short forms

Thai documents often write the month as a word or a short form with dots. These are the twelve months as they appear on forms and labels:

A useful pattern: month names ending in -khom have 31 days, those ending in -yon have 30, and February ends in -phan. The abbreviation for the era itself is พ.ศ. (pho so), which you will see in front of the year: พ.ศ. 2569. The Western year is marked ค.ศ. (kho so). For more everyday Thai, see our list of essential Thai phrases.

Frequently asked questions

What year is it in Thailand?

In 2026 the Thai year is B.E. 2569, and from 1 January 2027 it will be 2570. Thailand uses the Buddhist Era for official purposes, but the Western year is also widely used, especially in business and on imported goods.

How do I convert a Thai year to a Western year?

Subtract 543. For example, 2569 minus 543 is 2026. To go the other way, add 543. The rule works for all dates since 1 January 1941, when the Thai year began to start in January instead of April.

Are expiry dates in Thailand in the Buddhist Era?

Sometimes. The food labeling rule sets the order (day, month, year) and the wording, but not the era, so labels use either. A year around 2569 or 2570, or a short "69" or "70", is Buddhist Era; subtract 543.

Why is the Thai calendar 543 years ahead?

The Buddhist Era counts years from the time associated with the Buddha's passing into final nirvana in Thai tradition, which puts it 543 years ahead of the Common Era. Thailand has used it as its official era since the 1910s.

Sources

• Wikisource (Royal Gazette vol. 57, p. 420) – Calendar Year Act B.E. 2483, sections 1–4, in Thai (checked October 2026)
• Royal Gazette – Calendar Year Act B.E. 2483 (archived copy) (checked October 2026)
• Thai Food and Drug Administration – Ministry of Public Health Notification No. 450 (B.E. 2567) on food labeling, English translation (checked October 2026)