Convert a Gregorian date to the Islamic tabular civil calendar (or back); a calc...

{ "method": "GET", "queryParams": { "date": "2024-03-11" }, "type": "http" }

{ "example": { "asOf": "2026-10-11T08:54:33.116Z", "degraded": false, "disclaimer": "Screening signal computed from the named public source. Not financial, legal or investment advice; provided as is. Verify at the source before acting.", "from": "gregorian", "gregorian": { "day": 11, "iso": "2024-03-11", "month": 3, "weekday": "Monday", "year": 2024 }, "islamic": { "day": 1, "input": "1445-09-01", "leapYear": true, "month": 9, "monthLengthDays": 30, "monthName": "Ramadan", "observances": [ { "gregorian": "2023-07-19", "islamicDate": "1 Muharram", "name": "Islamic New Year" }, { "gregorian": "2023-07-28", "islamicDate": "10 Muharram", "name": "Ashura" } ], "text": "1 Ramadan 1445 AH", "year": 1445, "yearLengthDays": 355 }, "notChecked": [ "observed moon sighting and Umm al-Qura (Saudi) month starts, which can differ by 1 to 2 days: confirm religious dates with your local authority", "the astronomical-epoch (Thursday) variant of the tabular calendar, which is one day earlier", "…1 more" ], "reasons": [ "TABULAR approximation: months alternate 30 and 29 days with 11 leap years per 30-year cycle (years 2, 5, 7, 10, 13, 16, 18, 21, 24, 26, 29), civil (Friday) epoch of 16 July 622 Julian.", "The real calendar starts each month with a moon sighting or the Umm al-Qura table, so observed dates can differ from this one by a day or two." ], "source": "Reingold and Dershowitz, Calendrical Calculations: tabular Islamic calendar (civil epoch, 30-year cycle), computed locally", "summary": "2024-03-11 (Monday) is 1 Ramadan 1445 AH in the Islamic (tabular civil) calendar.", "supported": true, "verdict": "CONVERTED", "weekday": "Monday" }, "type": "json" }