Function calendrical_calculations::iso::iso_year_from_fixed

source ยท 
pub(crate) fn iso_year_from_fixed(date: RataDie) -> i64
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Lisp code reference: https://github.com/EdReingold/calendar-code2/blob/1ee51ecfaae6f856b0d7de3e36e9042100b4f424/calendar.l#L1191-L1217