elm-easter is a pure Elm library for computing the date of Easter for any given year, using Western, Orthodox or Julian algorithms.
-- Easter in year 2017, according to Western (most common) algorithm
easter Western 2017 -- 2017-04-16
-- Easter in year 1416, according to the Orthodox algorithm
easter Orthodox 1416 -- 1416-04-29
See the akheron/elm-easter package for full documentation.
Run the test suite:
elm-test