These are the official authorities and publications we use to check Ramadan, Eid and holiday dates on ramadanclock.com. Where an authority has not announced a date yet, we use the Umm al-Qura calendar and astronomical calculation, as explained on our How We Calculate Ramadan Dates page.
Official calendars and authorities
- Umm al-Qura Calendar, the official calendar of Saudi Arabia
- Diyanet İşleri Başkanlığı, Presidency of Religious Affairs, Turkey
- Kementerian Agama Republik Indonesia, Ministry of Religious Affairs, Indonesia
- Islamic Foundation Bangladesh, home of the National Moon Sighting Committee
- Moon Sighting Headquarters (Setad-e Esteghlal) of the Office of the Supreme Leader, Iran
- Central Ruet-e-Hilal Committee, Pakistan
Astronomical data
- NOAA Solar Calculator, the formulas we use for sunrise, sunset and dawn
News reports on 2027 dates and holidays
- Indonesia: detikNews, Antara, Metro TV, RRI
- Turkey: Milli Gazete, Dünya, Takvim
- Bangladesh: The Daily Ittefaq, The Daily Star Bangla
Last updated: 18 October 2026