Developer Launches Free API for Indonesia-Specific Hijri Calendar Dates

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An Indonesian developer has released mabims.dev, a free open-source API that provides Hijri calendar dates based on Indonesia's official MABIMS moon-sighting standard rather than Saudi Arabia's Umm al-Qura system. The two standards can differ by a full day, causing widespread distrust in online Hijri dates among Indonesian users, who often waited for government announcements instead. The API sources data from Indonesia's Ministry of Religious Affairs (Kemenag) tables for 2024–2026 and falls back to computed MABIMS criteria for dates up to 2053. It supports endpoints for today's date, single-date conversion, full month and year views, and even a sky chart visualising moon visibility. No API key is required, and the source code is publicly available on GitHub.

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