Swift - 实现公历、农历日期之间的相互转换

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//根据公历年、月、日获取对应的农历日期信息

func solarToLunar(year: Int, month: Int, day: Int) -> String {

    //初始化公历日历

    let solarCalendar = Calendar.init(identifier: .gregorian)

    var components = DateComponents()

    components.year = year

    components.month = month

    components.day = day

    components.hour = 12

    components.minute = 0

    components.second = 0

    components.timeZone = TimeZone.init(secondsFromGMT: 60 * 60 * 8)

    let solarDate = solarCalendar.date(from: components)

    //初始化农历日历

    let lunarCalendar = Calendar.init(identifier: .chinese)

    //日期格式和输出

    let formatter = DateFormatter()

    formatter.locale = Locale(identifier: "zh_CN")

    formatter.dateStyle = .medium

    formatter.calendar = lunarCalendar

    return formatter.string(from: solarDate!)

}

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print("公历：2017年11月11日")

print("农历：\(solarToLunar(year: 2017, month: 11, day: 11))")

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import Foundation

class LunarToSolar {

    fileprivate static var lunar_month_days = [

        1887, 0x1694, 0x16aa, 0x4ad5, 0xab6, 0xc4b7, 0x4ae, 0xa56, 0xb52a, 0x1d2a,

        0xd54, 0x75aa, 0x156a, 0x1096d, 0x95c, 0x14ae, 0xaa4d, 0x1a4c, 0x1b2a,

        0x8d55, 0xad4, 0x135a, 0x495d, 0x95c, 0xd49b, 0x149a, 0x1a4a, 0xbaa5, 0x16a8,

        0x1ad4, 0x52da, 0x12b6, 0xe937, 0x92e, 0x1496, 0xb64b, 0xd4a, 0xda8, 0x95b5,

        0x56c, 0x12ae, 0x492f, 0x92e, 0xcc96, 0x1a94, 0x1d4a, 0xada9, 0xb5a, 0x56c,

        0x726e, 0x125c, 0xf92d, 0x192a, 0x1a94, 0xdb4a, 0x16aa, 0xad4, 0x955b,

        0x4ba, 0x125a, 0x592b, 0x152a, 0xf695, 0xd94, 0x16aa, 0xaab5, 0x9b4, 0x14b6,

        0x6a57, 0xa56, 0x1152a, 0x1d2a, 0xd54, 0xd5aa, 0x156a, 0x96c, 0x94ae, 0x14ae,

        0xa4c, 0x7d26, 0x1b2a, 0xeb55, 0xad4, 0x12da, 0xa95d, 0x95a, 0x149a, 0x9a4d,

        0x1a4a, 0x11aa5, 0x16a8, 0x16d4, 0xd2da, 0x12b6, 0x936, 0x9497, 0x1496,

        0x1564b, 0xd4a, 0xda8, 0xd5b4, 0x156c, 0x12ae, 0xa92f, 0x92e, 0xc96, 0x6d4a,

        0x1d4a, 0x10d65, 0xb58, 0x156c, 0xb26d, 0x125c, 0x192c, 0x9a95, 0x1a94,

        0x1b4a, 0x4b55, 0xad4, 0xf55b, 0x4ba, 0x125a, 0xb92b, 0x152a, 0x1694, 0x96aa,

        0x15aa, 0x12ab5, 0x974, 0x14b6, 0xca57, 0xa56, 0x1526, 0x8e95, 0xd54, 0x15aa,

        0x49b5, 0x96c, 0xd4ae, 0x149c, 0x1a4c, 0xbd26, 0x1aa6, 0xb54, 0x6d6a, 0x12da,

        0x1695d,0x95a, 0x149a, 0xda4b, 0x1a4a, 0x1aa4, 0xbb54, 0x16b4, 0xada, 0x495b,

        0x936, 0xf497, 0x1496, 0x154a, 0xb6a5, 0xda4, 0x15b4, 0x6ab6, 0x126e, 0x1092f,

        0x92e, 0xc96, 0xcd4a, 0x1d4a, 0xd64, 0x956c, 0x155c, 0x125c, 0x792e, 0x192c,

        0xfa95, 0x1a94, 0x1b4a, 0xab55, 0xad4, 0x14da, 0x8a5d, 0xa5a, 0x1152b, 0x152a,

        0x1694, 0xd6aa, 0x15aa, 0xab4, 0x94ba, 0x14b6, 0xa56, 0x7527, 0xd26, 0xee53,

        0xd54, 0x15aa, 0xa9b5, 0x96c, 0x14ae, 0x8a4e, 0x1a4c, 0x11d26, 0x1aa4, 0x1b54,

        0xcd6a, 0xada, 0x95c, 0x949d, 0x149a, 0x1a2a, 0x5b25, 0x1aa4, 0xfb52, 0x16b4,

        0xaba, 0xa95b, 0x936, 0x1496, 0x9a4b, 0x154a, 0x136a5, 0xda4, 0x15ac ]

    fileprivate static var solar_1_1 = [

        1887, 0xec04c, 0xec23f, 0xec435, 0xec649, 0xec83e, 0xeca51, 0xecc46, 0xece3a,

        0xed04d, 0xed242, 0xed436, 0xed64a, 0xed83f, 0xeda53, 0xedc48, 0xede3d,

        0xee050, 0xee244, 0xee439, 0xee64d, 0xee842, 0xeea36, 0xeec4a, 0xeee3e,

        0xef052, 0xef246, 0xef43a, 0xef64e, 0xef843, 0xefa37, 0xefc4b, 0xefe41,

        0xf0054, 0xf0248, 0xf043c, 0xf0650, 0xf0845, 0xf0a38, 0xf0c4d, 0xf0e42,

        0xf1037, 0xf124a, 0xf143e, 0xf1651, 0xf1846, 0xf1a3a, 0xf1c4e, 0xf1e44,

        0xf2038, 0xf224b, 0xf243f, 0xf2653, 0xf2848, 0xf2a3b, 0xf2c4f, 0xf2e45,

        0xf3039, 0xf324d, 0xf3442, 0xf3636, 0xf384a, 0xf3a3d, 0xf3c51, 0xf3e46,

        0xf403b, 0xf424e, 0xf4443, 0xf4638, 0xf484c, 0xf4a3f, 0xf4c52, 0xf4e48,

        0xf503c, 0xf524f, 0xf5445, 0xf5639, 0xf584d, 0xf5a42, 0xf5c35, 0xf5e49,

        0xf603e, 0xf6251, 0xf6446, 0xf663b, 0xf684f, 0xf6a43, 0xf6c37, 0xf6e4b,

        0xf703f, 0xf7252, 0xf7447, 0xf763c, 0xf7850, 0xf7a45, 0xf7c39, 0xf7e4d,

        0xf8042, 0xf8254, 0xf8449, 0xf863d, 0xf8851, 0xf8a46, 0xf8c3b, 0xf8e4f,

        0xf9044, 0xf9237, 0xf944a, 0xf963f, 0xf9853, 0xf9a47, 0xf9c3c, 0xf9e50,

        0xfa045, 0xfa238, 0xfa44c, 0xfa641, 0xfa836, 0xfaa49, 0xfac3d, 0xfae52,

        0xfb047, 0xfb23a, 0xfb44e, 0xfb643, 0xfb837, 0xfba4a, 0xfbc3f, 0xfbe53,

        0xfc048, 0xfc23c, 0xfc450, 0xfc645, 0xfc839, 0xfca4c, 0xfcc41, 0xfce36,

        0xfd04a, 0xfd23d, 0xfd451, 0xfd646, 0xfd83a, 0xfda4d, 0xfdc43, 0xfde37,

        0xfe04b, 0xfe23f, 0xfe453, 0xfe648, 0xfe83c, 0xfea4f, 0xfec44, 0xfee38,

        0xff04c, 0xff241, 0xff436, 0xff64a, 0xff83e, 0xffa51, 0xffc46, 0xffe3a,

        0x10004e, 0x100242, 0x100437, 0x10064b, 0x100841, 0x100a53, 0x100c48,

        0x100e3c, 0x10104f, 0x101244, 0x101438, 0x10164c, 0x101842, 0x101a35,

        0x101c49, 0x101e3d, 0x102051, 0x102245, 0x10243a, 0x10264e, 0x102843,

        0x102a37, 0x102c4b, 0x102e3f, 0x103053, 0x103247, 0x10343b, 0x10364f,

        0x103845, 0x103a38, 0x103c4c, 0x103e42, 0x104036, 0x104249, 0x10443d,

        0x104651, 0x104846, 0x104a3a, 0x104c4e, 0x104e43, 0x105038, 0x10524a,

        0x10543e, 0x105652, 0x105847, 0x105a3b, 0x105c4f, 0x105e45, 0x106039,

        0x10624c, 0x106441, 0x106635, 0x106849, 0x106a3d, 0x106c51, 0x106e47,

        0x10703c, 0x10724f, 0x107444, 0x107638, 0x10784c, 0x107a3f, 0x107c53,

        0x107e48 ]

    fileprivate static func GetBitInt(data:Int, length:Int, shift:Int) -> Int {

        return (data&(((1<<length)-1)<<shift))>>shift

    }

    fileprivate static func SolarToInt(year:Int, month:Int, day:Int) -> Int {

        let m = (month + 9) % 12

        let y = year - m / 10

        return 365 * y + y / 4 - y / 100 + y / 400 + (m * 306 + 5) / 10 + (day - 1)

    }

    fileprivate static func SolarFromInt(g:Int) -> (Int, Int, Int){

        var y = (10000*g+14780)/3652425

        var ddd = g-(365*y+y/4-y/100+y/400)

        if ddd < 0 {

            y=y-1

            ddd = g-(365*y+y/4-y/100+y/400)

        }

        let mi = (100*ddd+52)/3060

        let mm = (mi+2)%12+1

        y = y+(mi+2)/12

        let dd = ddd-(mi*306+5)/10+1

        //return "\(y) \(mm) \(dd)"

        return (y, mm, dd)

    }

    static func convert(year: Int, month: Int, day: Int) -> (Int, Int, Int){

        //闰月范围1950-2050，如需要增加，自行增加

        //也就是说在1950-2050之外的阴历时间计算阳历，你需要自己给闰月。不然闰月计算阳历会出错

        var leapDic = [1952:5, 1955:3, 1957:8, 1960:6, 1963:4, 1966:3, 1968:7,

                       1971:5, 1974:4, 1976:8, 1979:6, 1982:4, 1984:10, 1987:6,

                       1990:5, 1993:3, 1995:8, 1998:5, 2001:4, 2004:2, 2006:7,

                       2009:5, 2012:4, 2014:9, 2017:6, 2020:4, 2023:2, 2025:6,

                       2028:5, 2031:3, 2033:11, 2036:6, 2039:5, 2042:2, 2044:7,

                       2047:5, 2050:3]

        let days = lunar_month_days[year-lunar_month_days[0]]

        let leap = GetBitInt(data: days, length: 4, shift: 13)

        var offset = 0

        var loopend = leap

        //判断是否是闰月

        var isleap = false

        if leapDic.keys.contains(year) {

            if leapDic[year] == month {

                isleap = true

            } else {

                isleap = false

            }

        }

        print("该农历日期是否闰月:\(isleap)")

        if !isleap {

            if month <= leap || leap == 0 {

                loopend = month-1

            } else {

                loopend = month

            }

        }

        for i in 0..<loopend {

            offset += GetBitInt(data: days, length: 1, shift: 12-i) == 1 ? 30 : 29

        }

        offset += day

        let solar11 = solar_1_1[year-solar_1_1[0]]

        let y = GetBitInt(data: solar11, length: 12, shift: 9)

        let m = GetBitInt(data: solar11, length: 4, shift: 5)

        let d = GetBitInt(data: solar11, length: 5, shift: 0)

        let g = SolarToInt(year: y, month: m, day: d)+offset-1

        return SolarFromInt(g: g)

    }

}

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//输出待转换的农历日期

print("农历：2017年九月初九")

//进行转换

let solar = LunarToSolar.convert(year: 2017, month: 9, day: 9)

//输出对应的的公历日期

print("公历：\(solar.0)年\(solar.1)月\(solar.2)日")