from datetime import datetime

def convert_str_to_datetime(date_string: str) -> datetime:
    """Converts a string to a datetime object

    :param date_string: String to convert
    :type date_string: str
    :return: Datetime object
    :rtype: datetime
    """
    return datetime.strptime(date_string, '%Y-%m-%dT%H:%M:%S.%fZ')