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农历节日计算的有问题，2021年02月10日并不是除夕。
农历节日计算的有问题，2021年02月10日并不是除夕。
问题出在这个方法上
/**
- 传回农历 year年month月的总天数，总共有13个月包括闰月
- @param year 将要计算的年份
- @param month 将要计算的月份
- @return 传回农历 year年month月的总天数 */ static int daysInLunarMonth(int year, int month) { if ((LUNAR_INFO[year - 1900] & (0x100000 >> month)) == 0) return 29; else return 30; }
替换 flutter_custom_calendar\lib\utils\lunar_util.dart 这个文件 ， 具体算法参考 https://gitee.com/6tail 这位同学的实现逻辑。大家可以试试。
import 'package:flutter_custom_calendar/flutter_custom_calendar.dart';
import 'package:flutter_custom_calendar/utils/solar_term_util.dart';
import 'dart:math';
///**
///* 农历的工具类
///*/
class LunarUtil {
static List
static List
////** ///* 保存每年24节气 ///*/ static final Map<int, List<String>> SOLAR_TERMS = new Map();
////** ///* 公历节日 ///*/ static List<String> SOLAR_CALENDAR = [ "0101元旦", "0214情人节", "0308妇女节", "0312植树节", "0315消权日", "0401愚人节", "0422地球日", "0501劳动节", "0504青年节", "0601儿童节", "0701建党节", "0801建军节", "0910教师节", "1001国庆节", "1031万圣节", "1111光棍节", "1224平安夜", "1225圣诞节", ];
/**
- 传统农历节日 */ static List<String> TRADITION_FESTIVAL_STR = [ "除夕", "0101春节", "0115元宵", "0505端午", "0707七夕", "0815中秋", "0909重阳", ];
/**
- 特殊节日、母亲节和父亲节,感恩节等 */ static final Map<int, List<String>> SPECIAL_FESTIVAL = new Map();
/**
- 特殊节日的数组 */ static List<String> SPECIAL_FESTIVAL_STR = [ "母亲节", "父亲节", "感恩节", ];
/**
- 用来表示1900年到2099年间农历年份的相关信息，共24位bit的16进制表示，其中：
-
- 前4位表示该年闰哪个月；
-
- 5-17位表示农历年份13个月的大小月分布，0表示小，1表示大；
-
- 最后7位表示农历年首（正月初一）对应的公历日期。
- 以2014年的数据0x955ABF为例说明：
- 1001 0101 0101 1010 1011 1111
- 闰九月 农历正月初一对应公历1月31号
*/
static final List
LUNAR_INFO = [ 0x84B6BF, /1900/ 0x04AE53, 0x0A5748, 0x5526BD, 0x0D2650, 0x0D9544, 0x46AAB9, 0x056A4D, 0x09AD42, 0x24AEB6, 0x04AE4A, /1901-1910/ 0x6A4DBE, 0x0A4D52, 0x0D2546, 0x5D52BA, 0x0B544E, 0x0D6A43, 0x296D37, 0x095B4B, 0x749BC1, 0x049754, /1911-1920/ 0x0A4B48, 0x5B25BC, 0x06A550, 0x06D445, 0x4ADAB8, 0x02B64D, 0x095742, 0x2497B7, 0x04974A, 0x664B3E, /1921-1930/ 0x0D4A51, 0x0EA546, 0x56D4BA, 0x05AD4E, 0x02B644, 0x393738, 0x092E4B, 0x7C96BF, 0x0C9553, 0x0D4A48, /1931-1940/ 0x6DA53B, 0x0B554F, 0x056A45, 0x4AADB9, 0x025D4D, 0x092D42, 0x2C95B6, 0x0A954A, 0x7B4ABD, 0x06CA51, /1941-1950/ 0x0B5546, 0x555ABB, 0x04DA4E, 0x0A5B43, 0x352BB8, 0x052B4C, 0x8A953F, 0x0E9552, 0x06AA48, 0x6AD53C, /1951-1960/ 0x0AB54F, 0x04B645, 0x4A5739, 0x0A574D, 0x052642, 0x3E9335, 0x0D9549, 0x75AABE, 0x056A51, 0x096D46, /1961-1970/ 0x54AEBB, 0x04AD4F, 0x0A4D43, 0x4D26B7, 0x0D254B, 0x8D52BF, 0x0B5452, 0x0B6A47, 0x696D3C, 0x095B50, /1971-1980/ 0x049B45, 0x4A4BB9, 0x0A4B4D, 0xAB25C2, 0x06A554, 0x06D449, 0x6ADA3D, 0x0AB651, 0x095746, 0x5497BB, /1981-1990/ 0x04974F, 0x064B44, 0x36A537, 0x0EA54A, 0x86B2BF, 0x05AC53, 0x0AB647, 0x5936BC, 0x092E50, 0x0C9645, /1991-2000/ 0x4D4AB8, 0x0D4A4C, 0x0DA541, 0x25AAB6, 0x056A49, 0x7AADBD, 0x025D52, 0x092D47, 0x5C95BA, 0x0A954E, /2001-2010/ 0x0B4A43, 0x4B5537, 0x0AD54A, 0x955ABF, 0x04BA53, 0x0A5B48, 0x652BBC, 0x052B50, 0x0A9345, 0x474AB9, /2011-2020/ 0x06AA4C, 0x0AD541, 0x24DAB6, 0x04B64A, 0x6a573D, 0x0A4E51, 0x0D2646, 0x5E933A, 0x0D534D, 0x05AA43, /2021-2030/ 0x36B537, 0x096D4B, 0xB4AEBF, 0x04AD53, 0x0A4D48, 0x6D25BC, 0x0D254F, 0x0D5244, 0x5DAA38, 0x0B5A4C, /2031-2040/ 0x056D41, 0x24ADB6, 0x049B4A, 0x7A4BBE, 0x0A4B51, 0x0AA546, 0x5B52BA, 0x06D24E, 0x0ADA42, 0x355B37, /2041-2050/ 0x09374B, 0x8497C1, 0x049753, 0x064B48, 0x66A53C, 0x0EA54F, 0x06AA44, 0x4AB638, 0x0AAE4C, 0x092E42, /2051-2060/ 0x3C9735, 0x0C9649, 0x7D4ABD, 0x0D4A51, 0x0DA545, 0x55AABA, 0x056A4E, 0x0A6D43, 0x452EB7, 0x052D4B, /2061-2070/ 0x8A95BF, 0x0A9553, 0x0B4A47, 0x6B553B, 0x0AD54F, 0x055A45, 0x4A5D38, 0x0A5B4C, 0x052B42, 0x3A93B6, /2071-2080/ 0x069349, 0x7729BD, 0x06AA51, 0x0AD546, 0x54DABA, 0x04B64E, 0x0A5743, 0x452738, 0x0D264A, 0x8E933E, /2081-2090/ 0x0D5252, 0x0DAA47, 0x66B53B, 0x056D4F, 0x04AE45, 0x4A4EB9, 0x0A4D4C, 0x0D1541, 0x2D92B5 /2091-2099/ ];
/**
- 初始化各种农历、节日
- @param calendar calendar */ static void setupLunarCalendar(DateModel dateModel) { int year = dateModel.year; int month = dateModel.month; int day = dateModel.day;
// dateModel.isWeekend = DateUtil.isWeekend(new DateTime(year, month, day)); // dateModel.isLeapYear = DateUtil.isLeapYear(year); // dateModel.isCurrentDay = DateUtil.isCurrentDay(year, month, day);
List<int> lunar = LunarUtil.solarToLunar(2020, 2, day);
// dateModel.lunarYear = (lunar[0]); // dateModel.lunarMonth = (lunar[1]); // dateModel.lunarDay = (lunar[2]);
// if (lunar[3] == 1) { // //如果是闰月 // dateModel.leapMonth = lunar[1]; // } //24节气 // String solarTerm = getSolarTerm(year, month, day); // dateModel.solarTerm=solarTerm; // //公历节日 // String gregorian = gregorianFestival(month, day); // dateModel.gregorianFestival=gregorian; // //传统农历节日 // String festival = getTraditionFestival(lunar[0], lunar[1], lunar[2]); // dateModel.traditionFestival=festival; //农历格式的日期 String lunarText = numToChinese(lunar[1], lunar[2], lunar[3]);
// if (gregorian.isEmpty) { // gregorian = getSpecialFestival(year, month, day); // } // if (solarTerm.isNotEmpty) { // dateModel.lunarString = solarTerm; // } else if (gregorian.isNotEmpty) { // dateModel.lunarString = gregorian; // } else if (festival.isNotEmpty) { // dateModel.lunarString = festival; // } else { // dateModel.lunarString = lunarText; // } }
/**
- 公历转农历 Solar To Lunar
- @param year 公历年
- @param month 公历月
- @param day 公历日
- @return [0]农历年 [1]农历月 [2]农历日 [3]是否闰月 0 false : 1 true
*/
static List
solarToLunar(int year, int month, int day) { List lunarInt = new List(4); int index = year - SOLAR[0]; int data = (year << 9) | (month << 5) | (day); int solar11; if (SOLAR[index] > data) { index--; } solar11 = SOLAR[index]; int y = getBitInt(solar11, 12, 9); int m = getBitInt(solar11, 4, 5); int d = getBitInt(solar11, 5, 0); int offset = solarToInt(year, month, day) - solarToInt(y, m, d);
int days = LUNAR_MONTH_DAYS[index];
int leap = getBitInt(days, 4, 13);
int lunarY = index + SOLAR[0];
int lunarM = 1;
int lunarD;
offset += 1;
for (int i = 0; i < 13; i++) {
int dm = getBitInt(days, 1, 12 - i) == 1 ? 30 : 29;
if (offset > dm) {
lunarM++;
offset -= dm;
} else {
break;
}
}
lunarD = offset;
lunarInt[0] = lunarY;
lunarInt[1] = lunarM;
lunarInt[3] = 0;
if (leap != 0 && lunarM > leap) {
lunarInt[1] = lunarM - 1;
if (lunarM == leap + 1) {
lunarInt[3] = 1;
}
}
lunarInt[2] = lunarD;
return lunarInt;
}
static int getBitInt(int data, int length, int shift) { return (data & (((1 << length) - 1) << shift)) >> shift; }
static int solarToInt(int y, int m, int d) { m = (m + 9) % 12; y = y - (m / 10).toInt(); return (365 * y + (y / 4).toInt() - (y / 100).toInt() + (y / 400).toInt() + ((m * 306 + 5) / 10).toInt() + (d - 1)); }
/**
- 返回24节气
- @param year 年
- @param month 月
- @param day 日
- @return 返回24节气 */ static String getSolarTerm(int year, int month, int day) { if (!SOLAR_TERMS.containsKey(year)) { SOLAR_TERMS.addAll({year: SolarTermUtil.getSolarTerms(year)}); } List<String> solarTerm = SOLAR_TERMS[year]; String text = "${year}" + getString(month, day); String solar = ""; for (String solarTermName in solarTerm) { if (solarTermName.contains(text)) { solar = solarTermName.replaceAll(text, ""); break; } } return solar; }
/**
- 数字转换为农历节日或者日期
- @param month 月
- @param day 日
- @param leap 1==闰月
- @return 数字转换为汉字日 */ static String numToChinese(int month, int day, int leap) { if (day == 1) { return numToChineseMonth(month, leap); } return CalendarConstants.LUNAR_DAY_TEXT[day - 1]; }
/**
- 数字转换为汉字月份
- @param month 月
- @param leap 1==闰月
- @return 数字转换为汉字月份 */ static String numToChineseMonth(int month, int leap) { if (leap == 1) { return "闰" + CalendarConstants.LUNAR_MONTH_TEXT[month - 1]; } return CalendarConstants.LUNAR_MONTH_TEXT[month - 1]; }
static String getString(int month, int day) { return (month >= 10 ? month.toString() : "0$month") + (day >= 10 ? day.toString() : "0$day"); }
/**
- 获取公历节日
- @param month 公历月份
- @param day 公历日期
- @return 公历节日 */ static String gregorianFestival(int month, int day) { String text = getString(month, day); String solar = ""; for (String aMSolarCalendar in SOLAR_CALENDAR) { if (aMSolarCalendar.contains(text)) { solar = aMSolarCalendar.replaceAll(text, ""); break; } } return solar; }
/**
- 返回传统农历节日
- @param year 农历年
- @param month 农历月
- @param day 农历日
- @return 返回传统农历节日 */ static String getTraditionFestival(int year, int month, int day) { if (month == 12) { int count = daysInLunarMonth(year, month); if (day == count) { return TRADITION_FESTIVAL_STR[0]; //除夕 } } String text = getString(month, day); String festivalStr = ""; for (String festival in TRADITION_FESTIVAL_STR) { if (festival.contains(text)) { festivalStr = festival.replaceAll(text, ""); break; } } return festivalStr; }
/**
- 传回农历 year年month月的总天数，总共有13个月包括闰月
- @param year 将要计算的年份
- @param month 将要计算的月份
- @return 传回农历 year年month月的总天数 / static int BASE_INDEX = 0; static int BASE_YEAR = 1900; static List LEAP_MONTH_YEAR = [6, 14, 19, 25, 33, 36, 38, 41, 44, 52, 55, 79, 117, 136, 147, 150, 155, 158, 185, 193]; static List LUNAR_MONTH = [0x00, 0x04, 0xad, 0x08, 0x5a, 0x01, 0xd5, 0x54, 0xb4, 0x09, 0x64, 0x05, 0x59, 0x45, 0x95, 0x0a, 0xa6, 0x04, 0x55, 0x24, 0xad, 0x08, 0x5a, 0x62, 0xda, 0x04, 0xb4, 0x05, 0xb4, 0x55, 0x52, 0x0d, 0x94, 0x0a, 0x4a, 0x2a, 0x56, 0x02, 0x6d, 0x71, 0x6d, 0x01, 0xda, 0x02, 0xd2, 0x52, 0xa9, 0x05, 0x49, 0x0d, 0x2a, 0x45, 0x2b, 0x09, 0x56, 0x01, 0xb5, 0x20, 0x6d, 0x01, 0x59, 0x69, 0xd4, 0x0a, 0xa8, 0x05, 0xa9, 0x56, 0xa5, 0x04, 0x2b, 0x09, 0x9e, 0x38, 0xb6, 0x08, 0xec, 0x74, 0x6c, 0x05, 0xd4, 0x0a, 0xe4, 0x6a, 0x52, 0x05, 0x95, 0x0a, 0x5a, 0x42, 0x5b, 0x04, 0xb6, 0x04, 0xb4, 0x22, 0x6a, 0x05, 0x52, 0x75, 0xc9, 0x0a, 0x52, 0x05, 0x35, 0x55, 0x4d, 0x0a, 0x5a, 0x02, 0x5d, 0x31, 0xb5, 0x02, 0x6a, 0x8a, 0x68, 0x05, 0xa9, 0x0a, 0x8a, 0x6a, 0x2a, 0x05, 0x2d, 0x09, 0xaa, 0x48, 0x5a, 0x01, 0xb5, 0x09, 0xb0, 0x39, 0x64, 0x05, 0x25, 0x75, 0x95, 0x0a, 0x96, 0x04, 0x4d, 0x54, 0xad, 0x04, 0xda, 0x04, 0xd4, 0x44, 0xb4, 0x05, 0x54, 0x85, 0x52, 0x0d, 0x92, 0x0a, 0x56, 0x6a, 0x56, 0x02, 0x6d, 0x02, 0x6a, 0x41, 0xda, 0x02, 0xb2, 0xa1, 0xa9, 0x05, 0x49, 0x0d, 0x0a, 0x6d, 0x2a, 0x09, 0x56, 0x01, 0xad, 0x50, 0x6d, 0x01, 0xd9, 0x02, 0xd1, 0x3a, 0xa8, 0x05, 0x29, 0x85, 0xa5, 0x0c, 0x2a, 0x09, 0x96, 0x54, 0xb6, 0x08, 0x6c, 0x09, 0x64, 0x45, 0xd4, 0x0a, 0xa4, 0x05, 0x51, 0x25, 0x95, 0x0a, 0x2a, 0x72, 0x5b, 0x04, 0xb6, 0x04, 0xac, 0x52, 0x6a, 0x05, 0xd2, 0x0a, 0xa2, 0x4a, 0x4a, 0x05, 0x55, 0x94, 0x2d, 0x0a, 0x5a, 0x02, 0x75, 0x61, 0xb5, 0x02, 0x6a, 0x03, 0x61, 0x45, 0xa9, 0x0a, 0x4a, 0x05, 0x25, 0x25, 0x2d, 0x09, 0x9a, 0x68, 0xda, 0x08, 0xb4, 0x09, 0xa8, 0x59, 0x54, 0x03, 0xa5, 0x0a, 0x91, 0x3a, 0x96, 0x04, 0xad, 0xb0, 0xad, 0x04, 0xda, 0x04, 0xf4, 0x62, 0xb4, 0x05, 0x54, 0x0b, 0x44, 0x5d, 0x52, 0x0a, 0x95, 0x04, 0x55, 0x22, 0x6d, 0x02, 0x5a, 0x71, 0xda, 0x02, 0xaa, 0x05, 0xb2, 0x55, 0x49, 0x0b, 0x4a, 0x0a, 0x2d, 0x39, 0x36, 0x01, 0x6d, 0x80, 0x6d, 0x01, 0xd9, 0x02, 0xe9, 0x6a, 0xa8, 0x05, 0x29, 0x0b, 0x9a, 0x4c, 0xaa, 0x08, 0xb6, 0x08, 0xb4, 0x38, 0x6c, 0x09, 0x54, 0x75, 0xd4, 0x0a, 0xa4, 0x05, 0x45, 0x55, 0x95, 0x0a, 0x9a, 0x04, 0x55, 0x44, 0xb5, 0x04, 0x6a, 0x82, 0x6a, 0x05, 0xd2, 0x0a, 0x92, 0x6a, 0x4a, 0x05, 0x55, 0x0a, 0x2a, 0x4a, 0x5a, 0x02, 0xb5, 0x02, 0xb2, 0x31, 0x69, 0x03, 0x31, 0x73, 0xa9, 0x0a, 0x4a, 0x05, 0x2d, 0x55, 0x2d, 0x09, 0x5a, 0x01, 0xd5, 0x48, 0xb4, 0x09, 0x68, 0x89, 0x54, 0x0b, 0xa4, 0x0a, 0xa5, 0x6a, 0x95, 0x04, 0xad, 0x08, 0x6a, 0x44, 0xda, 0x04, 0x74, 0x05, 0xb0, 0x25, 0x54, 0x03]; static int getDaysOfMonth(int year, int month) { var index = year - LunarUtil.BASE_YEAR + LunarUtil.BASE_INDEX; var v = 0, l = 0, d = 30; if (1 <= month && month <= 8) { v = LunarUtil.LUNAR_MONTH[2 * index]; l = month - 1; if (((v >> l) & 0x01) == 1) { d = 29; } } else if (9 <= month && month <= 12) { v = LunarUtil.LUNAR_MONTH[2 * index + 1]; l = month - 9; if (((v >> l) & 0x01) == 1) { d = 29; } } else { v = LunarUtil.LUNAR_MONTH[2 * index + 1]; v = (v >> 4) & 0x0F; if (v != month.abs()) { d = 0; } else { d = 29; for (var i = 0, j = LunarUtil.LEAP_MONTH_YEAR.length; i < j; i++) { if (LunarUtil.LEAP_MONTH_YEAR[i] == index) { d = 30; break; } } } } return d; } static int daysInLunarMonth(int year, int month) { return getDaysOfMonth(year, month); // if ((LUNAR_INFO[year - 1900] & (0x100000 >> month)) == 0) // return 29; // else // return 30; } /*
- 获取特殊计算方式的节日
- 如：每年五月的第二个星期日为母亲节，六月的第三个星期日为父亲节
- 每年11月第四个星期四定为"感恩节"
- @param year year
- @param month month
- @param day day
- @return 获取西方节日 */ static String getSpecialFestival(int year, int month, int day) { if (!SPECIAL_FESTIVAL.containsKey(year)) { SPECIAL_FESTIVAL.addAll({year: getSpecialFestivals(year)}); } List<String> specialFestivals = SPECIAL_FESTIVAL[year]; String text = "$year" + getString(month, day); String solar = ""; for (String special in specialFestivals) { if (special.contains(text)) { solar = special.replaceAll(text, ""); break; } } return solar; }
/**
- 获取每年的母亲节和父亲节和感恩节
- 特殊计算方式的节日
- @param year 年
- @return 获取每年的母亲节和父亲节、感恩节 */ static List<String> getSpecialFestivals(int year) { List<String> festivals = new List(3); DateTime dateTime = new DateTime(year, 5, 1);
//母亲节
int week = (dateTime.weekday + 1) % 8;
int startDiff = 7 - week + 1;
if (startDiff == 7) {
festivals[0] =
dateToString(year, 5, startDiff + 1) + SPECIAL_FESTIVAL_STR[0];
} else {
festivals[0] =
dateToString(year, 5, startDiff + 7 + 1) + SPECIAL_FESTIVAL_STR[0];
}
//父亲节
dateTime = new DateTime(year, 6, 1);
week = (dateTime.weekday + 1) % 8;
startDiff = 7 - week + 1;
if (startDiff == 7) {
festivals[1] =
dateToString(year, 6, startDiff + 7 + 1) + SPECIAL_FESTIVAL_STR[1];
} else {
festivals[1] = dateToString(year, 6, startDiff + 7 + 7 + 1) +
SPECIAL_FESTIVAL_STR[1];
}
//感恩节
dateTime = new DateTime(year, 11, 1);
week = (dateTime.weekday + 1) % 8;
startDiff = 7 - week + 1;
if (startDiff <= 2) {
festivals[2] =
dateToString(year, 11, startDiff + 21 + 5) + SPECIAL_FESTIVAL_STR[2];
} else {
festivals[2] =
dateToString(year, 11, startDiff + 14 + 5) + SPECIAL_FESTIVAL_STR[2];
}
return festivals;
}
static String dateToString(int year, int month, int day) { return "$year" + getString(month, day); } }
