根據公曆計算農曆

騎著螞蟻流浪發表於2019-01-14
#! /usr/bin/env python3
# -*- coding:utf-8 -*-

# Author   : mayi
# Blog     : http://www.cnblogs.com/mayi0312/
# Date     : 2019/1/14
# Name     : test01
# Software : PyCharm
# Note     : 用於實現根據公曆計算農曆的功能
# 匯入模組
import datetime

# 陣列g_lunar_month_day存入陰曆1901年到2050年每年中的月天數資訊,
# 陰曆每月只能是29或30天,一年用12(或13)個二進位制位表示,對應位為1表30天,否則為29天
g_lunar_month_day = [
    0x4ae0, 0xa570, 0x5268, 0xd260, 0xd950, 0x6aa8, 0x56a0, 0x9ad0, 0x4ae8, 0x4ae0,   # 1910
    0xa4d8, 0xa4d0, 0xd250, 0xd548, 0xb550, 0x56a0, 0x96d0, 0x95b0, 0x49b8, 0x49b0,   # 1920
    0xa4b0, 0xb258, 0x6a50, 0x6d40, 0xada8, 0x2b60, 0x9570, 0x4978, 0x4970, 0x64b0,   # 1930
    0xd4a0, 0xea50, 0x6d48, 0x5ad0, 0x2b60, 0x9370, 0x92e0, 0xc968, 0xc950, 0xd4a0,   # 1940
    0xda50, 0xb550, 0x56a0, 0xaad8, 0x25d0, 0x92d0, 0xc958, 0xa950, 0xb4a8, 0x6ca0,   # 1950
    0xb550, 0x55a8, 0x4da0, 0xa5b0, 0x52b8, 0x52b0, 0xa950, 0xe950, 0x6aa0, 0xad50,   # 1960
    0xab50, 0x4b60, 0xa570, 0xa570, 0x5260, 0xe930, 0xd950, 0x5aa8, 0x56a0, 0x96d0,   # 1970
    0x4ae8, 0x4ad0, 0xa4d0, 0xd268, 0xd250, 0xd528, 0xb540, 0xb6a0, 0x96d0, 0x95b0,   # 1980
    0x49b0, 0xa4b8, 0xa4b0, 0xb258, 0x6a50, 0x6d40, 0xada0, 0xab60, 0x9370, 0x4978,   # 1990
    0x4970, 0x64b0, 0x6a50, 0xea50, 0x6b28, 0x5ac0, 0xab60, 0x9368, 0x92e0, 0xc960,   # 2000
    0xd4a8, 0xd4a0, 0xda50, 0x5aa8, 0x56a0, 0xaad8, 0x25d0, 0x92d0, 0xc958, 0xa950,   # 2010
    0xb4a0, 0xb550, 0xb550, 0x55a8, 0x4ba0, 0xa5b0, 0x52b8, 0x52b0, 0xa930, 0x74a8,   # 2020
    0x6aa0, 0xad50, 0x4da8, 0x4b60, 0x9570, 0xa4e0, 0xd260, 0xe930, 0xd530, 0x5aa0,   # 2030
    0x6b50, 0x96d0, 0x4ae8, 0x4ad0, 0xa4d0, 0xd258, 0xd250, 0xd520, 0xdaa0, 0xb5a0,   # 2040
    0x56d0, 0x4ad8, 0x49b0, 0xa4b8, 0xa4b0, 0xaa50, 0xb528, 0x6d20, 0xada0, 0x55b0,   # 2050
]

# 陣列gLanarMonth存放陰曆1901年到2050年閏月的月份,如沒有則為0,每位元組存兩年
g_lunar_month = [
    0x00, 0x50, 0x04, 0x00, 0x20,   # 1910
    0x60, 0x05, 0x00, 0x20, 0x70,   # 1920
    0x05, 0x00, 0x40, 0x02, 0x06,   # 1930
    0x00, 0x50, 0x03, 0x07, 0x00,   # 1940
    0x60, 0x04, 0x00, 0x20, 0x70,   # 1950
    0x05, 0x00, 0x30, 0x80, 0x06,   # 1960
    0x00, 0x40, 0x03, 0x07, 0x00,   # 1970
    0x50, 0x04, 0x08, 0x00, 0x60,   # 1980
    0x04, 0x0a, 0x00, 0x60, 0x05,   # 1990
    0x00, 0x30, 0x80, 0x05, 0x00,   # 2000
    0x40, 0x02, 0x07, 0x00, 0x50,   # 2010
    0x04, 0x09, 0x00, 0x60, 0x04,   # 2020
    0x00, 0x20, 0x60, 0x05, 0x00,   # 2030
    0x30, 0xb0, 0x06, 0x00, 0x50,   # 2040
    0x02, 0x07, 0x00, 0x50, 0x03    # 2050
]

# 年份
ly = `零一二三四五六七八九`
# 月份
lm = `正二三四五六七八九十冬臘`
# 日份
ld = `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`

def strToDate(c_date):
    """
    將8位日期字串轉換成日期格式
    :param c_date: 8位日期字串
    :return: 對應的日期格式:若返回-1代表字串長度不對,若返回-2代表轉換失敗,字串格式非法
    """
    if len(c_date) != 8:
        # 字串長度不正確
        return -1
    #
    year = int(c_date[:4])
    #
    month = int(c_date[4:6])
    #
    day = int(c_date[6:])
    try:
        d_date = datetime.date(int(year), int(month), int(day))
        return d_date
    except:
        # 轉換失敗,格式非法
        return -2

def lunarYearDays(year):
    """
    計算某農曆年有多少天
    :param year: 年份(農曆)
    :return: 農曆天數
    """
    days = 0
    for i in range(1, 13):
        (high, low) = lunarMonthDays(year, i)
        days += high
        days += low

    return days

def lunarMonthDays(year, month):
    """
    計算某年某月農曆有多少天
    :param year: 年份(農曆)
    :param month: 月份(農曆)
    :return: 天數
    """
    if (year < 1901):
        return 30

    high, low = 0, 29
    iBit = 16 - month
    if (month > getLeapMonth(year)) and getLeapMonth(year):
        iBit -= 1
    if (g_lunar_month_day[year - 1901] & (1 << iBit)):
        low += 1
    if (month == getLeapMonth(year)):
        if (g_lunar_month_day[year - 1901] & (1 << (iBit - 1))):
            high = 30
        else:
            high = 29

    return (high, low)

def getLeapMonth(year):
    """
    返回該年的閏月,若返回0,代表該年沒有閏月
    :param year: 年份(農曆)
    :return: 閏月的月份,若該年沒有閏月,則返回0
    """
    flag = g_lunar_month[(year - 1901) // 2]
    if (year - 1901) % 2:
        return flag & 0x0f
    else:
        return flag >> 4

def lunarDate(d_date):
    """
    將公曆日期轉換成農曆日期(查表法)
    :param d_date: 公曆日期
    :return: 農曆日期
    """
    # 從1901.1.1計算,至今過了多少天
    delta_days = (d_date - datetime.date(1901, 1, 1)).days
    # 陽曆1901年02月19日為陰曆1901年正月初一
    # 陽曆1901年01月01日到1901年02月19日共有49天
    if delta_days < 49:
        year = 1901 - 1
        if delta_days < 19:
            month = 11
            day = delta_days + 11
        else:
            month = 12
            day = delta_days - 18
    else:
        # 下面從陰曆1901年正月初一算起
        delta_days -= 49
        year, month, day = 1901, 1, 1
        # 計算年
        temp = lunarYearDays(year)
        while delta_days >= temp:
            delta_days -= temp
            year += 1
            temp = lunarYearDays(year)
        # 計算月
        (foo, temp) = lunarMonthDays(year, month)
        while delta_days >= temp:
            delta_days -= temp
            if (month == getLeapMonth(year)):
                (temp, foo) = lunarMonthDays(year, month)
                if (delta_days < temp):
                    year, month, day = 0, 0, 0
                delta_days -= temp
            month += 1
            (foo, temp) = lunarMonthDays(year, month)
        # 計算日
        day += delta_days
    # 將數字年份資訊轉成中文年份資訊
    temp_year = str(year)
    year = ""
    for i in temp_year:
        year += ly[int(i)]

    return "農曆:%s年%s月%s" % (year, lm[month - 1], ld[(day - 1) * 2:day * 2])

# 主函式
def main():
    # 輸入8位公曆日期(字串)
    c_date = input("請輸入8位的公曆日期(如:20180101):")
    # 將8位字串轉成日期格式
    d_date = strToDate(c_date)
    if d_date == -1:
        print("您輸入的公曆日期長度錯誤!")
        return -1
    elif d_date == -2:
        print("您輸入的公曆日期格式錯誤!")
        return -1
    # 將公曆日期轉換成農曆日期
    l_date = lunarDate(d_date)
    # 分別列印公曆、農曆
    print("公曆:%s" % (d_date))
    print(l_date)

# 入口函式
if __name__ == `__main__`:
    main()

實驗結果如下:

請輸入8位的公曆日期(如:20180101):20190114
公曆:2019-01-14
農曆:二零一八年臘月初九

 

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