local p = {}
local function extract(num, pos, len)
local shifted = math.floor(num / (2 ^ pos))
local result = shifted % (2 ^ len)
return result
end
-- 天干
local HEAVENLY_STEMS = { '甲', '乙', '丙', '丁', '戊', '己', '庚', '辛', '壬', '癸' }
-- 地支
local EARTHLY_BRANCHES = { '子', '丑', '寅', '卯', '辰', '巳', '午', '未', '申', '酉', '戌', '亥' }
-- 月份
local LUNAR_MONTHS = { '正', '二', '三', '四', '五', '六', '七', '八', '九', '十', '冬', '腊' }
-- 日期
local LUNAR_DAYS = {
'初一', '初二', '初三', '初四', '初五', '初六', '初七', '初八', '初九', '初十',
'十一', '十二', '十三', '十四', '十五', '十六', '十七', '十八', '十九', '二十',
'廿一', '廿二', '廿三', '廿四', '廿五', '廿六', '廿七', '廿八', '廿九', '三十'
}
-- 农历数据 (1900-2100)
local LUNAR_INFO = {
0x04bd8,
0x04ae0,
0x0a570,
0x054d5,
0x0d260,
0x0d950,
0x16554,
0x056a0,
0x09ad0,
0x055d2, --1900-1909
0x04ae0,
0x0a5b6,
0x0a4d0,
0x0d250,
0x1d255,
0x0b540,
0x0d6a0,
0x0ada2,
0x095b0,
0x14977, --1910-1919
0x04970,
0x0a4b0,
0x0b4b5,
0x06a50,
0x06d40,
0x1ab54,
0x02b60,
0x09570,
0x052f2,
0x04970, --1920-1929
0x06566,
0x0d4a0,
0x0ea50,
0x06e95,
0x05ad0,
0x02b60,
0x186e3,
0x092e0,
0x1c8d7,
0x0c950, --1930-1939
0x0d4a0,
0x1d8a6,
0x0b550,
0x056a0,
0x1a5b4,
0x025d0,
0x092d0,
0x0d2b2,
0x0a950,
0x0b557, --1940-1949
0x06ca0,
0x0b550,
0x15355,
0x04da0,
0x0a5b0,
0x14573,
0x052b0,
0x0a9a8,
0x0e950,
0x06aa0, --1950-1959
0x0aea6,
0x0ab50,
0x04b60,
0x0aae4,
0x0a570,
0x05260,
0x0f263,
0x0d950,
0x05b57,
0x056a0, --1960-1969
0x096d0,
0x04dd5,
0x04ad0,
0x0a4d0,
0x0d4d4,
0x0d250,
0x0d558,
0x0b540,
0x0b6a0,
0x195a6, --1970-1979
0x095b0,
0x049b0,
0x0a974,
0x0a4b0,
0x0b27a,
0x06a50,
0x06d40,
0x0af46,
0x0ab60,
0x09570, --1980-1989
0x04af5,
0x04970,
0x064b0,
0x074a3,
0x0ea50,
0x06b58,
0x055c0,
0x0ab60,
0x096d5,
0x092e0, --1990-1999
0x0c960,
0x0d954,
0x0d4a0,
0x0da50,
0x07552,
0x056a0,
0x0abb7,
0x025d0,
0x092d0,
0x0cab5, --2000-2009
0x0a950,
0x0b4a0,
0x0baa4,
0x0ad50,
0x055d9,
0x04ba0,
0x0a5b0,
0x15176,
0x052b0,
0x0a930, --2010-2019
0x07954,
0x06aa0,
0x0ad50,
0x05b52,
0x04b60,
0x0a6e6,
0x0a4e0,
0x0d260,
0x0ea65,
0x0d530, --2020-2029
0x05aa0,
0x076a3,
0x096d0,
0x04afb,
0x04ad0,
0x0a4d0,
0x1d0b6,
0x0d250,
0x0d520,
0x0dd45, --2030-2039
0x0b5a0,
0x056d0,
0x055b2,
0x049b0,
0x0a577,
0x0a4b0,
0x0aa50,
0x1b255,
0x06d20,
0x0ada0, --2040-2049
0x14b63,
0x09370,
0x049f8,
0x04970,
0x064b0,
0x168a6,
0x0ea50,
0x06b20,
0x1a6c4,
0x0aae0, --2050-2059
0x0a2e0,
0x0d2e3,
0x0c960,
0x0d557,
0x0d4a0,
0x0da50,
0x05d55,
0x056a0,
0x0a6d0,
0x055d4, --2060-2069
0x052d0,
0x0a9b8,
0x0a950,
0x0b4a0,
0x0b6a6,
0x0ad50,
0x055a0,
0x0aba4,
0x0a5b0,
0x052b0, --2070-2079
0x0b273,
0x06930,
0x07337,
0x06aa0,
0x0ad50,
0x14b55,
0x04b60,
0x0a570,
0x054e4,
0x0d160, --2080-2089
0x0e968,
0x0d520,
0x0daa0,
0x16aa6,
0x056d0,
0x04ae0,
0x0a9d4,
0x0a2d0,
0x0d150,
0x0f252, --2090-2099
0x0d520,
} --2100
-- 检查日期是否合法
local function isValidDate(year, month, day)
local days = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }
if (year % 4 == 0 and year % 100 ~= 0) or (year % 400 == 0) then
days[2] = 29
end
return day <= days[month]
end
-- 计算指定公历日期是一年中的第几天
local function getDayOfYear(year, month, day)
local days = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }
if (year % 4 == 0 and year % 100 ~= 0) or (year % 400 == 0) then
days[2] = 29
end
local dayOfYear = day
for i = 1, month - 1 do
dayOfYear = dayOfYear + days[i]
end
return dayOfYear
end
local function leapMonth(y)
return extract(LUNAR_INFO[y - 1900], 0, 4)
end
local function leapDays(y)
if leapMonth(y) > 0 then
return extract(LUNAR_INFO[y - 1900], 16, 1) > 0 and 30 or 29
end
return 0
end
local function monthDays(y, m)
if m > 12 or m < 1 then return -1 end
local bit = extract(LUNAR_INFO[y - 1900], 16 - m, 1)
return bit > 0 and 30 or 29
end
local function lYearDays(y)
local sum = 348
local info = LUNAR_INFO[y - 1900]
for i = 15, 4, -1 do
local bit = extract(info, i, 1)
if bit > 0 then
sum = sum + 1
end
end
return sum + leapDays(y)
end
-- 将公历日期转换为农历日期
function p.toLunar(frame)
local date = frame.args[1]
-- 输入格式验证
if not date:match('^%d%d%d%d%-%d%d%-%d%d$') then
return '错误：日期格式无效，请使用YYYY-MM-DD格式'
end
local year = tonumber(date:sub(1, 4))
local month = tonumber(date:sub(6, 7))
local day = tonumber(date:sub(9, 10))
-- 输入日期范围验证
if year < 1900 or year > 2100 then
return '错误：年份超出范围(1900-2100)'
end
if month < 1 or month > 12 then
return '错误：月份无效'
end
if not isValidDate(year, month, day) then
return '错误：日期无效'
end
-- 计算总天数
local offset = getDayOfYear(year, month, day)
local temp = 0
-- 计算农历年份
for i = 1900, year - 1 do
temp = lYearDays(i)
offset = offset + temp
end
-- 计算农历月份和日期
local lunarYear = year
local lunarMonth = 1
local lunarDay = 1
temp = lYearDays(lunarYear)
while offset > temp do
offset = offset - temp
lunarYear = lunarYear + 1
temp = lYearDays(lunarYear)
end
temp = monthDays(lunarYear, lunarMonth)
while offset > temp do
offset = offset - temp
lunarMonth = lunarMonth + 1
if lunarMonth > 12 then
lunarMonth = 1
lunarYear = lunarYear + 1
end
temp = monthDays(lunarYear, lunarMonth)
end
lunarDay = offset
-- 生成输出
local stemIndex = (lunarYear - 4) % 10
local branchIndex = (lunarYear - 4) % 12
local result = HEAVENLY_STEMS[stemIndex + 1] .. EARTHLY_BRANCHES[branchIndex + 1] .. '年'
local isLeapMonth = false
local lm = leapMonth(lunarYear)
if lm > 0 and lunarMonth > lm then
lunarMonth = lunarMonth - 1
if lunarMonth == lm then
isLeapMonth = true
end
end
if isLeapMonth then
result = result .. '闰'
end
result = result .. LUNAR_MONTHS[lunarMonth] .. '月' .. LUNAR_DAYS[lunarDay]
return result
end
return p