Swift - 实现公历、农历日期之间的相互转换
作者：hangge | 2017-11-13 08:10
有时我们需要根据一个公历（阳历）日期，得到对应的农历（阴历）日期。或者反过来，根据农历日期计算对应的公历日期。下面通过样例演示如何实现这两个日期的转换。
一、公历转农历
1，转换函数定义
公历转农历比较简单，直接借助系统提供的 Calendar 即可。为方便使用，这里定义一个日期转换方法。我们将公历日期的年、月、日作为参数传入，便能返回对应的农历日期（字符串形式）。
//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!)
}
2，使用样例
print("公历：2017年11月11日")
print("农历：\(solarToLunar(year: 2017, month: 11, day: 11))")
二、农历转公历
1，转换类定义
农历转公历稍微麻烦些，这里我将其封装成一个工具类。需要转换时调用 convert 方法，将农历日期的年、月、日作为参数传入，便能返回对应的公历日期的年、月、日（元组形式）。
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)
}
}
2，使用样例
//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")
全部评论（1）
航哥辛苦了~能否介绍下日期的处理，比如给定日期所在周的首末时间，所在月的首末时间，前一个月后一个月首末时间的计算之类的，对calendar这块的东西很不了解
站长回复：其实我之前也写过类似的文章，你可以参考下：Swift - 获取（当月、当年、任意月|年）的第一天、最后一天日期，看完应该就会明白大概的用法了。