Converts Ethiopian calendar dates into Gregorian and vice versa.
ES6 implementation of Ethiopian dates conversion.
Based on calendariale
let ethiopic = require('ethiopic-js')
ethiopic.toEthiopian(1992, 10, 4) // [1985, 1, 24]
ethiopic.toGregorian(1985, 1, 24) // [1992, 10, 4]