@staticmethod
def __date_time_str(dt):
    """
        reformat the date_tiem string
        example: 1/1/2018 01:00:00 -> 1/1/2018 00:00:00
        :param dt:
        :return:
        """
    date_time_item = dt.split(' ')
    date_str = date_time_item[0]
    time_str = date_time_item[1]
    time_item = time_str.split(':')
    hr = time_item[0]
    hr_int = int(hr)
    hr_int = hr_int - 1
    return date_str + ' ' + str(hr_int) + ':' + time_item[1] + ':' + time_item[
        2]
