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calendar.lunar.go
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calendar.lunar.go
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package carbon
// 中国农历历法
import (
"fmt"
"strings"
)
var (
// 支持的最小和最大年份
minYear, maxYear = 1900, 2100
// 中国农历数字
chineseNumbers = []string{"零", "一", "二", "三", "四", "五", "六", "七", "八", "九"}
// 中国农历月份
chineseMonths = []string{"正", "二", "三", "四", "五", "六", "七", "八", "九", "十", "十一", "腊"}
// 中国农历日期前缀
chineseDayPrefixes = []string{"初", "十", "廿", "卅"}
// 生肖
animals = []string{"猴", "鸡", "狗", "猪", "鼠", "牛", "虎", "兔", "龙", "蛇", "马", "羊"}
// 节日
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"}
// 农历
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 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 将公历转为农历
func (c Carbon) Lunar() (l lunar) {
if c.IsInvalid() {
return
}
c = c.SetTimezone(PRC)
// leapMonths:闰月总数,daysOfYear:年天数,daysOfMonth:月天数,leapMonth:闰月月份
leapMonths, daysInYear, daysInMonth, leapMonth := 14, 365, 30, 0
// 有效范围检验
if c.Year() < minYear || c.Year() > maxYear {
return
}
// 计算距离1900年1月31日相差的天数
offset := int(c.DiffInDaysWithAbs(CreateFromDateTime(minYear, 1, 31, 0, 0, 0)))
for l.year = minYear; l.year <= maxYear && offset > 0; l.year++ {
daysInYear = l.getDaysInYear()
offset -= daysInYear
leapMonths += 12
}
if offset < 0 {
offset += daysInYear
l.year--
leapMonths -= 12
}
l.isLeapMonth = false
// 获取闰月月份
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
}
if !l.isLeapMonth {
leapMonths++
}
}
// 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--
leapMonths--
}
}
// offset小于0时,也要校正
if offset < 0 {
offset += daysInMonth
l.month--
leapMonths--
}
l.day = offset + 1
return
}
// 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 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 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 获取生肖
func (l lunar) Animal() string {
if l.year == 0 {
return ""
}
return animals[l.year%MonthsPerYear]
}
// Festival 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 获取农历年
func (l lunar) Year() int {
return l.year
}
// Month 获取农历月
func (l lunar) Month() int {
return l.month
}
// LeapMonth 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 获取农历日
func (l lunar) Day() int {
return l.day
}
// ToYearString 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 获取农历月字符串
func (l lunar) ToMonthString() string {
if l.month == 0 {
return ""
}
return chineseMonths[l.month-1]
}
// ToDayString 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 获取农历年月日字符串
func (l lunar) ToString() string {
if l.year == 0 {
return ""
}
return l.String()
}
// String 实现 Stringer 接口
func (l lunar) String() string {
if l.year == 0 {
return ""
}
return l.ToYearString() + "年" + l.ToMonthString() + "月" + l.ToDayString()
}
// IsLeapYear 是否是闰年
func (l lunar) IsLeapYear() bool {
if l.year == 0 {
return false
}
return l.LeapMonth() != 0
}
// IsLeapMonth 是否是闰月
func (l lunar) IsLeapMonth() bool {
if l.month == 0 {
return false
}
return l.month == l.LeapMonth()
}
// IsRatYear 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 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 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 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 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 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 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 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 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 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 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 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
}