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Thai Solar Date Converter

Convert between Gregorian dates and modern Thai solar dates using Buddhist Era year numbering with Gregorian month and day values.

Enter a Gregorian date to return the matching modern Thai solar date.

Live output

Result

Ready to convert

Choose a direction, enter a Gregorian or Thai solar date, and the result appears here without leaving the page.

Guide

Convert Thai solar dates and Gregorian dates

This Thai Solar Date Converter changes Gregorian calendar dates into modern Thai solar dates and converts Thai solar input back into Gregorian dates. It is intended for official and civil date lookup where the Thai Buddhist Era year appears with Gregorian month and day values.

The implementation uses a fixed 543-year offset for the year while retaining the Gregorian month and day. That makes Thai solar conversion different from lunar Buddhist calendar traditions and from historical Thai calendar variants that are not modeled here.

Use this page when a document or form shows a Thai Buddhist Era date such as 2569-06-30 and you need the corresponding Gregorian date, or when you have a Gregorian date and need the modern Thai civil year.

What it handles

Modern Thai civil conversion coverage

The converter covers the modern Thai solar calendar as a civil year-numbering system. It does not change the month names, month lengths, or day positions because the current Thai solar calendar follows Gregorian month and day structure.

Both directions use the same offset logic, so a Thai solar date converted to Gregorian can be converted back without changing the calendar basis.

Gregorian to Thai solar

Enter a Gregorian date and return the Thai Buddhist Era year with the same month and day.

Thai solar to Gregorian

Enter a Thai solar date in YYYY-MM-DD format and subtract the 543-year offset to recover the Gregorian date.

Civil date validation

The reverse conversion checks the resulting Gregorian date with standard month and day validation.

How to use

Use the Thai solar conversion modes

Choose the direction based on the source date you already have. The page expects one input at a time: either a Gregorian date or a Thai solar date in the text field.

For Thai solar input, keep the month and day in two-digit form. The converter treats 2569-06-30 as Buddhist Era year 2569, Gregorian-style month 06, and day 30.

1

Choose Gregorian to Thai solar

Use this direction for a Gregorian date such as 2026-06-30. The result is 2569-06-30 in modern Thai solar notation.

2

Choose Thai solar to Gregorian

Use this direction for Thai solar input such as 2569-06-30. The result is the matching Gregorian date.

3

Do not use it for historical Thai variants

This page handles modern civil Thai solar dates only. It does not model older New Year transitions or regional historical calendar rules.

Examples

Reference conversions from the local implementation

These examples are generated from the same offset-based conversion logic used by the form. They show that Thai solar conversion changes the year number while preserving the Gregorian month and day.

Gregorian date to Thai solar date

2026-06-30 -> 2569-06-30

The Gregorian date 2026-06-30 converts to Thai solar 2569-06-30.

Thai solar date to Gregorian date

2569-06-30 -> 2026-06-30

The Thai solar input 2569-06-30 converts back to Gregorian 2026-06-30.

FAQ

Thai solar conversion notes

Thai solar dates are easy to confuse with other Buddhist Era calendars because the same BE year number appears in multiple contexts. These answers keep the page scoped to modern Thai civil date conversion.

Is Thai solar the same as the Buddhist Date Converter?

They often produce the same modern year, month, and day for current civil dates, but this page explicitly models Thai solar civil usage with a 543-year offset.

Does the month or day change?

No. Modern Thai solar dates retain Gregorian month and day values. The converter changes the year by 543 years.

Does this handle old Thai New Year rules?

No. The page targets modern official usage and does not apply historical New Year or calendar adoption rules.

Reference

Calendar implementation reference

The conversion rule is implemented directly as a Buddhist Era year offset for modern Thai solar dates. ICU calendar documentation is still useful background for related Buddhist Era calendar identifiers used elsewhere in this converter set.