写一段程序来计算日天干地支

下面是一个Python程序示例，可以根据输入的日期计算出对应的日天干地支：

import datetime

tiangan = "甲乙丙丁戊己庚辛壬癸"
dizhi = "子丑寅卯辰巳午未申酉戌亥"

def get_tiangan(day):
    offset = (day.year - 4) % 60
    return tiangan[offset % 10]

def get_dizhi(day):
    offset = (day.year - 4) % 60
    return dizhi[offset % 12]

def get_tiangan_dizhi(day):
    tiangan = get_tiangan(day)
    dizhi = get_dizhi(day)
    offset = (day.day - 1) % 60
    tiangan_day = tiangan[offset % 10]
    dizhi_day = dizhi[offset % 12]
    return tiangan_day + dizhi_day

# 测试程序
day = datetime.date(2022, 2, 8)
tiangan_dizhi = get_tiangan_dizhi(day)
print(f"{day} 的日天干地支为：{tiangan_dizhi}")

程序的核心思路是根据输入的日期先计算出对应的年份的天干和地支，然后根据日期计算出对应的日天干和地支。最后将天干和地支合并起来即可得到日天干地支。