java 计算农历公式

计算农历日期的公式是基于农历的月份、日和年份的计算。以下是一个Java函数示例，用于计算农历日期：

public class LunarCalendar {
    private static final String[] LUNAR_MONTHS = {"正", "二", "三", "四", "五", "六", "七", "八", "九", "十", "冬", "腊"};
    private static final String[] LUNAR_DAYS = {"初", "十", "廿", "卅"};
    private static final String[] LUNAR_NUMBERS = {"一", "二", "三", "四", "五", "六", "七", "八", "九", "十"};

    private static int getLunarYear(int year) {
        int lunarYear = year - 1900 + 36;
        if (year > 1900 && year < 1912 && lunarYear % 4 == 0) {
            lunarYear -= 1;
        }
        return lunarYear;
    }

    private static int getLunarMonth(int month) {
        return month - 1;
    }

    private static int getLunarDay(int day) {
        return day - 1;
    }

    private static String getLunarMonthName(int month) {
        return LUNAR_MONTHS[month];
    }

    private static String getLunarDayName(int day) {
        int index = day / 10;
        if (index > 0) {
            return LUNAR_DAYS[index] + LUNAR_NUMBERS[day % 10 - 1];
        } else {
            return LUNAR_NUMBERS[day - 1];
        }
    }

    public static void main(String[] args) {
        int year = 2022;
        int month = 2;
        int day = 1;

        int lunarYear = getLunarYear(year);
        int lunarMonth = getLunarMonth(month);
        int lunarDay = getLunarDay(day);

        String lunarMonthName = getLunarMonthName(lunarMonth);
        String lunarDayName = getLunarDayName(lunarDay);

        System.out.println("农历日期：" + lunarYear + "年" + lunarMonthName + "月" + lunarDayName);
    }
}

在上述示例中，我们定义了几个辅助函数来计算农历年、月和日的值。然后，我们将给定的公历日期转换为农历日期，并打印出来。在这个示例中，我们计算的是2022年2月1日的农历日期。输出结果为："农历日期：2022年腊月初一"。