The Nahdlatul Ulama Executive Board (PBNU), representing Indonesia's largest Islamic organization, has accused the Ministry of Religious Affairs of data manipulation in determining the date of Eid al-Fitr 1447 H, reigniting tensions over who holds authority to set the Islamic calendar in the world's largest Muslim-majority democracy.
PBNU's allegations, reported by Akurat.co, center on the ministry's hisab (astronomical calculation) methodology for determining when the new crescent moon marks the beginning of Shawwal, the month following Ramadan. NU traditionally relies on rukyat (physical moon sighting), while Muhammadiyah uses mathematical calculations—a methodological divide that has occasionally produced different Eid dates.
The controversy carries historical weight. In 2011, what Indonesians darkly refer to as the "Opor Tragedy" illustrated the social disruption caused by last-minute calendar changes. That year, the government had set August 30 as the Eid public holiday based on advance calculations. Muhammadiyah confirmed August 30 as 1 Shawwal. But on August 29 at 8:25 PM—85 minutes later than usual—the Ministry of Religious Affairs announced Eid would actually fall on August 31.
The late announcement came after tarawih prayers should have concluded if fasting continued. Families faced confusion about whether to perform final Ramadan prayers or begin Eid celebrations. The "opor" reference—a traditional Eid chicken dish—became shorthand for the chaos of prepared celebrations suddenly postponed.
PBNU's current allegations suggest the ministry may be prioritizing calendar unity over methodological integrity, possibly adjusting calculation parameters to align with Muhammadiyah's date rather than following NU's rukyat tradition. For NU, with an estimated 90 million followers, this represents more than technical disagreement—it touches questions of religious autonomy and the state's proper role in Islamic practice.
In Indonesia, as across archipelagic democracies, unity in diversity requires constant negotiation across islands, ethnicities, and beliefs. The Eid date dispute exemplifies how model of Islamic democracy must balance state coordination with respect for diverse interpretations within the .
