from datetime import datetime


def convert_date_to_timestamp(date_to_convert):
    """
        This function is useful to convert date (YYYYmmdd) to timestamp
    Args:
        date_to_convert (str): date (YYYYmmdd) to be converted in timestamp

    Returns:
        (timestamp): date_to_convert converted in timestamp

    """
    return int(datetime.strptime(date_to_convert, '%Y%m%d').timestamp())