Last library of 平成. So, in Japan change era. This library is my memorial library.

EraCalculator can convert other Era years. This example is Calculates what year of 大化 was when the 平成 was 大化.

let expected = Era(eraType: .大化, year: 1345)
let got = EraType.平成.convert(to: EraType.大化)
XCTAssertEqual(got.eraType, expected.eraType)
XCTAssertEqual(got.year, expected.year)
XCTAssertEqual(got.description, "大化 1345年")

EraCalculator is available under the MIT license. See the LICENSE file for more info.