def ts2HMS(ts):
    return time.strftime(‘%Y-%m-%d‘, time.localtime(ts))

def HMS2ts(date):
    return int(time.mktime(time.strptime(date, ‘%Y-%m-%d‘)))

def ts2HMS_1(ts):
    return time.strftime(‘%Y-%m-%d %H:%M:%S‘,time.localtime(ts))

def check_main(start,end,DAY_NUM):
    ‘‘‘
    输入数据:
    start：开始日期，格式“年-月-日”
    end：结束日期，格式“年-月-日”
    ‘‘‘
    start_time = time.time()
    day = (HMS2ts(end)-HMS2ts(start))/(24*60*60)  
　　 print day   #day=26

if __name__ == ‘__main__‘:
    #read_mongo()
    start = ‘2018-05-01‘
    end = ‘2018-05-27‘