def get_iso_time(date_time):
    """
    Converts the provided datetime object to an ISO-format time-tag.

    Parameters
    ----------
    date_time : datetime.datetime
        Datetime object to convert to ISO format.

    Returns
    -------
    time_in_iso : str
        Provided time in ISO format: YYYY-MM-DDTHH:MM:SS.mmmmmmZ

    """
    time_in_iso = date_time.isoformat(sep='T', timespec='microseconds') + "Z"

    return time_in_iso