Convert dates between different calendar systems.
1/3/2026
Sunday
16/2/2026
Julian Day: 2461100
12 Ramadan 1447 AH
12/9/1447
24 Iyar 2026
24/2/2026
While the Gregorian calendar is used worldwide for civil purposes, many cultures and religions use different calendar systems. The Islamic (Hijri) calendar is lunar-based with 12 months of 29-30 days. The Hebrew calendar is lunisolar, combining lunar months with solar year corrections. The Julian calendar, predecessor to the Gregorian, is still used by some Orthodox churches.
Our converter helps you find corresponding dates across these systems β useful for religious observances, historical research, and cultural understanding. Combine with our Weekday Calculator to find the day of the week, or check leap years across different systems.
Our converter uses the astronomical calculation method. Actual Islamic dates may vary by 1-2 days as some communities rely on moon sightings.
It is a continuous count of days since January 1, 4713 BC. Astronomers use it to easily calculate time spans between dates across different calendar eras.
Different civilizations developed calendars based on solar, lunar, or lunisolar cycles to track seasons, religious observances, and agricultural cycles.
Convert between Gregorian, Julian, Islamic, and Hebrew calendars.
Convert dates from any era or time period.
Learn about different calendar systems and their history.
Convert dates between Gregorian, Julian, Islamic (Hijri), and Hebrew calendars with our free online converter. Accurate conversions using standard astronomical algorithms. Perfect for historical research, religious observances, and cross-cultural planning.
Our converter supports Gregorian, Julian, Islamic (Hijri), and Hebrew calendar systems.
Our converter uses standard astronomical algorithms for precise date conversions across all supported calendar systems.
Yes! Convert dates from any time period. The tool handles the transition between Julian and Gregorian calendars correctly.
Last updated: February 12, 2026