Calendar Converter
Convert any date between the Gregorian, Hebrew, Islamic (Hijri), Persian, Chinese, Japanese, Buddhist, Indian, Coptic, Ethiopian and Julian calendars, with the Julian Day Number, the Mayan Long Count and the next Chinese New Year, Ramadan, Rosh Hashanah and Nowruz.
How to Use
- Choose the calendar you are converting from, then pick the year, month and day in it. Gregorian is the usual Western calendar.
- Read the same day in every other calendar, in English and in its own script.
- The month grid shows the Gregorian month with the matching day of a second calendar in each cell; pick which one with Show in the grid.
- The list of coming dates shows the next Chinese New Year, Rosh Hashanah, Passover, Ramadan, Eid al-Fitr, Eid al-Adha, Nowruz, Ethiopian New Year and Easter after your date.
Worked Example
Saturday 3 October 2026 (Gregorian). Its Julian Day Number is 2,461,317. Every calendar below is that same day counted a different way:
Hebrew: the year 5787 began on 1 Tishri, 12 September 2026, so 3 October is 21 days later, 22 Tishri 5787, the festival of Shemini Atzeret. Islamic: 22 Rabiʻ II 1448 AH in Saudi Arabia’s Umm al-Qura calendar, or 20 Rabiʻ II by the tabular calendar. Persian: 11 Mehr 1405. Chinese: the 23rd day of the eighth month of the bing-wu year (the Fire Horse). Julian: 13 days behind, 20 September 2026.
The common mistake: forgetting that some days start at sunset. Hebrew and Islamic days run from sunset to sunset, so on the evening of 3 October the Hebrew date is already 23 Tishri, and a festival listed for a date begins the evening before it.
Show Work
Formulas
Three Ways to Keep a Calendar
Every calendar has to reconcile the day, the month and the year, which do not divide into each other. Solar calendars, such as the Gregorian and the Persian, follow the seasons and let the months drift from the moon. Lunar calendars, such as the Islamic, follow the moon exactly, so their 354-day year moves through all the seasons in about 33 years; that is why Ramadan comes around 11 days earlier each year.
Lunisolar calendars do both. The Hebrew calendar adds a 13th month in 7 years out of every 19, the Metonic cycle known to Babylonian astronomers, and the Chinese calendar adds a leap month whenever a lunar month passes without one of the twelve principal solar terms. Converting between them is only reliable through a continuous day count, which is why astronomers use the Julian Day Number, introduced by Joseph Scaliger in 1583.
About This Tool
This converter turns a date in any of 13 calendars into 14, written in English and in each calendar’s own script, with the Julian Day Number and Mayan Long Count. It uses the calendar data built into your browser, from the Unicode Common Locale Data Repository, including the Umm al-Qura tables and Chinese leap months. Chinese and Korean month starts are checked against a precise new-moon calculation, because the browser data puts some of them a day out; Chinese New Year 2027 is 6 February, not 7. It also lists the next major festivals and new years from your date.
Religious dates can depend on local moon sighting and on the day starting at sunset; treat them as a guide and check with your community. Everything runs in your browser.
Related tools: Day of Week Calculator, Date Calculator, and Unix Timestamp Converter.
Frequently Asked Questions
Why do Islamic dates differ by a day or two between sources?
The Islamic calendar is lunar, and many communities start each month when the new crescent moon is actually seen, which depends on the weather and where you are. Saudi Arabia’s official Umm al-Qura calendar is computed in advance from the moon’s position; the tabular (civil) calendar uses a fixed 30-year cycle. On 3 October 2026 the two give 22 and 20 Rabiʻ II 1448. Check local announcements for religious dates.
When does a Hebrew or Islamic day begin?
At sunset, not midnight. The converter gives the date for the daylight hours of the Gregorian day, so the evening of 3 October 2026 is already 23 Tishri 5787. Festivals listed here start on the evening before the date shown.
What is the Julian calendar, and when did countries switch?
The calendar introduced by Julius Caesar in 46 BC, with a leap year every four years. It drifts by about three days every 400 years, which the Gregorian calendar of 1582 corrected. Catholic countries switched in 1582, Britain and its colonies in 1752, and Russia in 1918. Today the two are 13 days apart, and several Orthodox churches still date festivals by the Julian calendar.
How does the Chinese calendar work?
It is lunisolar: each month starts at a new moon, and a leap month is added about every three years so that the year stays in step with the seasons. Chinese New Year therefore falls between 21 January and 20 February. Years are also named in a 60-year cycle; 2026 is bing-wu, the year of the Fire Horse.
What are the Julian Day Number and the Mayan Long Count?
The Julian Day Number counts days continuously from 1 January 4713 BC; astronomers use it to subtract dates across calendars. The Maya Long Count counts days from a starting point in 3114 BC, in units of 1, 20, 360, 7,200 and 144,000 days. Using the standard GMT correlation, 21 December 2012 was 13.0.0.0.0, the end of the 13th baktun.
How do I use the Calendar Converter?
Simply type or paste your value and read the result, which refreshes the instant you change something. There is nothing to submit and nothing to wait for.
Is it free? Does it work without internet?
Yes to both. It is free with no sign-up, and once the page has loaded it keeps working even with no internet.
Where does my data go?
Nowhere — every calculation runs on your own device. Nothing you enter is uploaded, logged, or stored.
Common Use Cases
Religious dates
Find a Hebrew or Islamic date for a yahrzeit, a bar mitzvah, Ramadan or Eid; the Hebrew year 5787 began at sunset on 11 September 2026.
Genealogy and history
Turn old Julian dates into Gregorian ones: the Battle of Hastings on 14 October 1066 (Julian) was 20 October in the Gregorian calendar.
Official documents
Read dates on Iranian, Afghan, Ethiopian, Thai, Japanese or Taiwanese documents, which use their own calendars.
Festivals and travel
See when Chinese New Year, Nowruz or Ethiopian New Year falls next, to plan around holidays.
Astronomy
Get the Julian Day Number of any date for astronomical calculations.
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