def page_time(detester):

    date_list = []
    start_date = datetime.strptime(detester, "%Y%m%d")
    for x in range(30):
        one_day = dtd(1)
        start_date += one_day
        next_date = start_date.strftime("%Y%m%d")
        date_list.append(next_date)
    return  date_list

start = "20180101"
list_date = page_time(start)
print(list_date)