package carbon import ( "fmt" "strings" ) var ( minYear, maxYear = 1900, 2100 chineseNumbers = []string{"零", "一", "二", "三", "四", "五", "六", "七", "八", "九"} chineseMonths = []string{"正", "二", "三", "四", "五", "六", "七", "八", "九", "十", "十一", "腊"} chineseDayPrefixes = []string{"初", "十", "廿", "卅"} animals = []string{"猴", "鸡", "狗", "猪", "鼠", "牛", "虎", "兔", "龙", "蛇", "马", "羊"} festivals = []string{"春节", "元宵节", "端午节", "七夕节", "中元节", "中秋节", "重阳节", "寒衣节", "下元节", "腊八节", "小年"} lunarTerms = []int{ 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, 0x16a95, 0x05ad0, 0x02b60, 0x186e3, 0x092e0, 0x1c8d7, 0x0c950, //1930-1939 0x0d4a0, 0x1d8a6, 0x0b550, 0x056a0, 0x1a5b4, 0x025d0, 0x092d0, 0x0d2b2, 0x0a950, 0x0b557, //1940-1949 0x06ca0, 0x0b550, 0x15355, 0x04da0, 0x0a5d0, 0x14573, 0x052d0, 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, 0x0b5a0, 0x195a6, //1970-1979 0x095b0, 0x049b0, 0x0a974, 0x0a4b0, 0x0b27a, 0x06a50, 0x06d40, 0x0af46, 0x0ab60, 0x09570, //1980-1989 0x04af5, 0x04970, 0x064b0, 0x074a3, 0x0ea50, 0x06b58, 0x05ac0, 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, 0x04bd7, 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 } ) // lunar define lunar structure // 定义 lunar 结构体 type lunar struct { year, month, day int // 农历年、月、日 isLeapMonth bool // 是否是闰月 } // Lunar convert the gregorian calendar into the lunar calendar // 将公历转为农历 func (c Carbon) Lunar() (l lunar) { if c.IsInvalid() { return } // leapMonths:闰月总数,daysOfYear:年天数,daysOfMonth:月天数,leapMonth:闰月月份 daysInYear, daysInMonth, leapMonth := 365, 30, 0 // 有效范围检验 if c.Year() < minYear || c.Year() > maxYear { return } offset := int(c.DiffInDaysWithAbs(c.CreateFromDateTime(minYear, 1, 31, 0, 0, 0))) for l.year = minYear; l.year <= maxYear && offset > 0; l.year++ { daysInYear = l.getDaysInYear() offset -= daysInYear } if offset < 0 { offset += daysInYear l.year-- } l.isLeapMonth = false leapMonth = l.LeapMonth() for l.month = 1; l.month <= 12 && offset > 0; l.month++ { if leapMonth > 0 && l.month == (leapMonth+1) && !l.isLeapMonth { l.month-- l.isLeapMonth = true daysInMonth = l.getDaysInLeapMonth() } else { daysInMonth = l.getDaysInMonth() } offset -= daysInMonth if l.isLeapMonth && l.month == (leapMonth+1) { l.isLeapMonth = false } } // offset为0时,并且刚才计算的月份是闰月,要校正 if offset == 0 && leapMonth > 0 && l.month == leapMonth+1 { if l.isLeapMonth { l.isLeapMonth = false } else { l.isLeapMonth = true l.month-- } } // offset小于0时,也要校正 if offset < 0 { offset += daysInMonth l.month-- } l.day = offset + 1 return } // getDaysInYear get days in lunar year // 获取该年总天数 func (l lunar) getDaysInYear() int { var i, sum = 0, 348 for i = 0x8000; i > 0x8; i >>= 1 { if (lunarTerms[l.year-minYear] & i) != 0 { sum++ } } return sum + l.getDaysInLeapMonth() } // getDaysInMonth get days in lunar month // 获取该月总天数 func (l lunar) getDaysInMonth() int { if (lunarTerms[l.year-minYear] & (0x10000 >> uint(l.month))) == 0 { return 29 } return 30 } // getDaysInLeapMonth get days in lunar leap month // 获取闰月总天数 func (l lunar) getDaysInLeapMonth() int { if l.LeapMonth() == 0 { return 0 } if (lunarTerms[l.year-minYear] & 0x10000) != 0 { return 30 } return 29 } // Animal get lunar animal name // 获取生肖 func (l lunar) Animal() string { if l.year == 0 { return "" } return animals[l.year%MonthsPerYear] } // Festival get lunar festival name // 获取农历节日 func (l lunar) Festival() string { if l.year == 0 { return "" } index := -1 switch { case l.month == 1 && l.day == 1: index = 0 case l.month == 1 && l.day == 15: index = 1 case l.month == 5 && l.day == 5: index = 2 case l.month == 7 && l.day == 7: index = 3 case l.month == 7 && l.day == 15: index = 4 case l.month == 8 && l.day == 15: index = 5 case l.month == 9 && l.day == 9: index = 6 case l.month == 10 && l.day == 1: index = 7 case l.month == 10 && l.day == 15: index = 8 case l.month == 12 && l.day == 8: index = 9 case l.month == 12 && l.day == 23: index = 10 default: return "" } return festivals[index] } // Year get lunar year // 获取农历年 func (l lunar) Year() int { return l.year } // Month get lunar month // 获取农历月 func (l lunar) Month() int { return l.month } // LeapMonth get lunar leap month //获取农历闰月月份 func (l lunar) LeapMonth() int { if l.year == 0 { return 0 } return lunarTerms[l.year-minYear] & 0xf } // Day get lunar day // 获取农历日 func (l lunar) Day() int { return l.day } // ToYearString output a lunar year string // 获取农历年字符串 func (l lunar) ToYearString() string { if l.year == 0 { return "" } year := fmt.Sprintf("%d", l.year) for i, replace := range chineseNumbers { year = strings.Replace(year, fmt.Sprintf("%d", i), replace, -1) } return year } // ToMonthString output a lunar month string // 获取农历月字符串 func (l lunar) ToMonthString() string { if l.month == 0 { return "" } return chineseMonths[l.month-1] } // ToDayString output a lunar day string // 获取农历日字符串 func (l lunar) ToDayString() string { if l.day == 0 { return "" } day := "" switch l.day { case 10: day = "初十" case 20: day = "二十" case 30: day = "三十" default: day = chineseDayPrefixes[(l.day/10)] + chineseNumbers[l.day%10] } return day } // ToString output a lunar date string // 获取农历日期字符串 func (l lunar) ToDateString() string { if l.year == 0 { return "" } return l.ToYearString() + "年" + l.ToMonthString() + "月" + l.ToDayString() } // String output a string in YYYY-MM-DD format, implement Stringer interface // 实现 Stringer 接口 func (l lunar) String() string { if l.year == 0 { return "" } return fmt.Sprintf("%d-%02d-%02d", l.year, l.month, l.day) } // IsLeapYear whether is leap year // 是否是闰年 func (l lunar) IsLeapYear() bool { if l.year == 0 { return false } return l.LeapMonth() != 0 } // IsLeapMonth whether is leap month // 是否是闰月 func (l lunar) IsLeapMonth() bool { if l.month == 0 { return false } return l.month == l.LeapMonth() } // IsRatYear whether is year of Rat // 是否是鼠年 func (l lunar) IsRatYear() bool { if l.year == 0 { return false } if l.year%MonthsPerYear == 4 { return true } return false } // IsOxYear whether is year of Ox // 是否是牛年 func (l lunar) IsOxYear() bool { if l.year == 0 { return false } if l.year%MonthsPerYear == 5 { return true } return false } // IsTigerYear whether is year of Tiger // 是否是虎年 func (l lunar) IsTigerYear() bool { if l.year == 0 { return false } if l.year%MonthsPerYear == 6 { return true } return false } // IsRabbitYear whether is year of Rabbit // 是否是兔年 func (l lunar) IsRabbitYear() bool { if l.year == 0 { return false } if l.year%MonthsPerYear == 7 { return true } return false } // IsDragonYear whether is year of Dragon // 是否是龙年 func (l lunar) IsDragonYear() bool { if l.year == 0 { return false } if l.year%MonthsPerYear == 8 { return true } return false } // IsSnakeYear whether is year of Snake // 是否是蛇年 func (l lunar) IsSnakeYear() bool { if l.year == 0 { return false } if l.year%MonthsPerYear == 9 { return true } return false } // IsHorseYear whether is year of Horse // 是否是马年 func (l lunar) IsHorseYear() bool { if l.year == 0 { return false } if l.year%MonthsPerYear == 10 { return true } return false } // IsGoatYear whether is year of Goat // 是否是羊年 func (l lunar) IsGoatYear() bool { if l.year == 0 { return false } if l.year%MonthsPerYear == 11 { return true } return false } // IsMonkeyYear whether is year of Monkey // 是否是猴年 func (l lunar) IsMonkeyYear() bool { if l.year == 0 { return false } if l.year%MonthsPerYear == 0 { return true } return false } // IsRoosterYear whether is year of Rooster // 是否是鸡年 func (l lunar) IsRoosterYear() bool { if l.year == 0 { return false } if l.year%MonthsPerYear == 1 { return true } return false } // IsDogYear whether is year of Dog // 是否是狗年 func (l lunar) IsDogYear() bool { if l.year == 0 { return false } if l.year%MonthsPerYear == 2 { return true } return false } // IsPigYear whether is year of Pig // 是否是猪年 func (l lunar) IsPigYear() bool { if l.year == 0 { return false } if l.year%MonthsPerYear == 3 { return true } return false }