Are my date inputs uploaded?

No. The conversion runs in the browser and does not send dates to a server.

Is the Hijri result an official religious date?

No. The tool uses the civil/tabular Islamic calendar for deterministic conversion. Local official announcements can differ by about one day.

How is the Buddhist Era year calculated?

Thai Buddhist Era years are calculated by adding 543 to the Gregorian year.

Calendar Converter - Gregorian, Hijri, Buddhist Era

Calendar Converter

Convert dates between Gregorian, Buddhist Era, and civil Hijri calendars in your browser.

Gregorian to Buddhist EraBuddhist Era to GregorianGregorian to HijriHijri to Gregorian

Gregorian date

Result

Select a Gregorian date

Calculated with the civil/tabular Islamic calendar. Local official moon-sighting announcements may differ by about one day.

All calculations run locally in your browser.

Convert dates across calendar systems

Use this calendar converter when you need to compare a Gregorian date with Thai Buddhist Era years or civil Hijri dates. The tool runs locally and is designed for date reference, travel planning, documentation checks, and quick calendar lookups.

How the methods work

Buddhist Era conversion is fixed year arithmetic. Hijri conversion uses the civil/tabular Islamic calendar so the result is deterministic; official dates for Ramadan and Eid can still differ by country because local authorities may use moon-sighting announcements.

Related date pages

Islamic calendar dates 2026 Buddhist calendar 2026 Catholic dates 2026

Calendar Converter FAQ

Are my date inputs uploaded?: No. The conversion runs in the browser and does not send dates to a server.
Is the Hijri result an official religious date?: No. The tool uses the civil/tabular Islamic calendar for deterministic conversion. Local official announcements can differ by about one day.
How is the Buddhist Era year calculated?: Thai Buddhist Era years are calculated by adding 543 to the Gregorian year.