How to use the libmozdata.utils.get_date function in libmozdata

def send_email(self, date="today"):
        """Send the email"""
        if date:
            date = lmdutils.get_date(date)
            d = lmdutils.get_date_ymd(date)
            if isinstance(self, Nag):
                self.nag_date = d

            if not self.must_run(d):
                return

        if not self.has_enough_data():
            logger.info("The tool {} hasn't enough data to run".format(self.name()))
            return

        login_info = utils.get_login_info()
        title, body = self.get_email(date)
        if title:
            receivers = self.get_receivers()
            status = "Success"

def send():
    path = utils.get_config("common", "log")
    try:
        n = os.path.getsize(path)
        if n != 0:
            login_info = utils.get_login_info()
            date = lmdutils.get_date("today")
            msg, files = get_msg(path)
            mail.send(
                login_info["ldap_username"],
                utils.get_config("common", "on-errors"),
                "[autonag] Something bad happened when running auto-nag the {}".format(
                    date
                ),
                msg,
                html=False,
                login=login_info,
                dryrun=False,
                files=files,
            )
    except Exception:
        pass

def get_bz_params(self, date):
        tomorrow = lmdutils.get_date("tomorrow")
        start_date, _ = self.get_dates(date)
        fields = ["creator"]
        params = {
            "include_fields": fields,
            "resolution": "---",
            "f1": "longdesc",
            "o1": "regexp",
            "v1": "([[:<:]]{}[[:>:]])|([[:<:]]{}?[[:>:]])|({}?[ \t]+{}[ \t]+{})[ \t]*:".format(
                *map(utils.bz_ignore_case, ("str", "steps", "steps", "to", "reproduce"))
            ),
            "f2": "cf_has_str",
            "o2": "equals",
            "v2": "---",
            "n3": 1,
            "f3": "cf_has_str",
            "o3": "changedbefore",