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import fire
import datetime

def cal_days(date_str1, date_str2):
    '''计算两个日期之间的天数'''

    date_str1 = str(date_str1)
    date_str2 = str(date_str2)
    d1 = datetime.datetime.strptime(date_str1, '%Y%m%d')
    d2 = datetime.datetime.strptime(date_str2, '%Y%m%d')
    delta = d1 - d2
    return delta.days


def days2today(date_str):
    '''计算某天距离今天的天数'''

    date_str = str(date_str)
    d = datetime.datetime.strptime(date_str, '%Y%m%d')
    delta = datetime.datetime.now() - d
    return delta.days


if __name__ == '__main__':
    fire.Fire()
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作者：secondsilverman 
来源：CSDN 
原文：https://blog.csdn.net/u010099080/article/details/70332074 
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