Calendar Converter

About the Calendar Converter

Enter a date in any of 15 calendars and see the same day in all the others: Gregorian, Islamic Hijri (Umm al-Qura and the two tabular versions), Persian Solar Hijri, Hebrew, India’s national Saka calendar, the Bangla calendar of Bangladesh, Ethiopian, Coptic, Buddhist, Japanese era, Republic of China (Minguo), Chinese lunar and Julian. Each result is written in English and, where it is the custom, in the calendar’s own language and script — Arabic, Persian, Hebrew numerals, Hindi, Bengali, Amharic, Thai, Japanese or Chinese.

The month view shows any month of any of these calendars with the Gregorian date in every square, so you can see at a glance when Ramadan, Tishri or Boishakh begins and ends. The conversions use the calendar algorithms built into your browser (Unicode CLDR / ICU) plus official tables and rules where those are more reliable, and nothing leaves your device.

Common uses

• Finding the Gregorian dates of Ramadan, Eid, Rosh Hashanah, Nowruz, Pohela Boishakh or Chinese New Year.
• Reading dates on Indian government documents (Saka), Bangladeshi papers (Bangla), Iranian, Israeli, Ethiopian, Thai, Japanese or Taiwanese documents.
• Converting historical and genealogical dates between the Julian and Gregorian calendars.

Which Islamic Hijri calendar should I use?

Islamic months begin with the first sighting of the new crescent, so the true date depends on where and when the moon is seen. Umm al-Qura is Saudi Arabia’s official calculated calendar and the most common choice for a quick answer. The tabular calendars use a fixed 30-year cycle and differ only in their starting day (civil: Friday 16 July 622, Julian; astronomical: Thursday 15 July 622); they are predictable but drift from the real moon by up to a day or two.

Where months are started by local sighting — India, Pakistan and Bangladesh, for example — dates are often a day later than Umm al-Qura. In 2026, the Umm al-Qura calendar puts Id-ul-Fitr (1 Shawwal 1447) on 20 March and Id-ul-Zuha (10 Dhuʻl-Hijjah) on 27 May, while India’s Central Government holiday list has them on 21 March and 28 May. Always check religious dates with your local authority.

How each calendar is converted

• Hijri, Persian, Hebrew, Indian Saka, Ethiopian and Coptic come from the ICU calendar code in your browser. The Persian calendar uses the 33-year arithmetic rule, which matches Iran’s astronomical calendar from 1925 to about 2090; the Umm al-Qura table covers 1300–1600 AH, outside which the tabular rule is used.
• Chinese dates for lunar years 1901–2099 come from the Hong Kong Observatory’s official conversion tables. Your browser’s own calculation puts 15 month starts in that period on the wrong side of midnight — Chinese New Year 2027, for example, on 7 instead of 6 February — so it is only used outside that range.
• Bangla follows the Bangla Academy’s 2019 revision: Boishakh to Ashwin have 31 days, Kartik to Magh and Choitro 30, and Falgun 29 (30 in leap years), so 1 Boishakh is always 14 April, 21 February is 8 Falgun and 16 December is 1 Poush.
• Saka (India’s national calendar since 22 March 1957) starts on 22 March, or 21 March in leap years.
• Buddhist, Japanese and ROC years count from different starting points but use Gregorian months and days: BE = CE + 543, Reiwa 1 = 2019 (from 1 May), Minguo 1 = 1912.
• Julian dates use the Julian calendar’s leap year every four years; it is 13 days behind the Gregorian calendar from 14 March 1900 to 13 March 2100 (Gregorian dates). The Julian Day Number counts days continuously from 4713 BC, as used in astronomy.

Limitations

• Islamic and Hebrew days begin at sunset; here every day runs from midnight to midnight, so after sunset it is already the next date in those calendars.
• Religious dates that depend on moon sighting can differ by a day from every calculated calendar.
• Dates from 1 January 1 to 31 December 9999 (Gregorian) are supported. Japanese era dates start in 1873, ROC dates in 1912, and each calendar starts at its own year 1. Gregorian dates before 1582 are proleptic.
• Hindu lunisolar calendars (Vikram Samvat, regional panchangs), the Nepali Bikram Sambat and the Bengali calendar of West Bengal are calculated differently and are not included.

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