Gregorian to Hijri Date Converter

This tool calculates the positions of the Sun and Moon. A new Hijri month starts on the day after the first evening on which, at sunset at the reference point (Banda Aceh), the conjunction (ijtimak) has passed and the Moon meets the new MABIMS criteria: an altitude of at least 3° and an elongation of at least 6.4°. If they are not met, the current month is completed at 30 days. Kemenag has applied these criteria since 2022, replacing the earlier 2°, 3° and 8-hour criteria.

We checked the results against 23 official dates from 2024 to 2027, taken from government announcements and the joint decree of three ministers (SKB 3 Menteri): the start of Ramadan, Eid al-Fitr, Eid al-Adha, 1 Muharram, Mawlid and Isra Mi’raj. All of them matched. Astronomical positions are calculated with the MIT-licensed astronomy-engine library.

In Indonesia, the start of Ramadan, Shawwal and Dhu al-Hijjah is set at an isbat session that combines calculation (hisab) and moon sighting (rukyat). Other organizations and countries use different criteria: for example, Muhammadiyah set 1 Shawwal 1447 AH on 20 March 2026, while the government set it on 21 March 2026. Saudi Arabia’s Umm al-Qura calendar is shown for comparison and often differs by one day from Indonesia.

The supported range is Gregorian years 1900 to 2099. For dates before 2022, the tool uses the current criteria, not the ones in force at the time. Treat the results here as estimates; for worship purposes, refer to announcements from Kemenag or the organization you follow.