Function calendrical_calculations::islamic::observational_islamic_from_fixed

source ยท 
pub fn observational_islamic_from_fixed(date: RataDie) -> (i32, u8, u8)
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Lisp code reference: https://github.com/EdReingold/calendar-code2/blob/1ee51ecfaae6f856b0d7de3e36e9042100b4f424/calendar.l#L6983-L6995