How to use the mozregression.dates.parse_date function in mozregression

def _convert_to_bisect_arg(self, value):
        """
        Transform a string value to a date or datetime if it looks like it.
        """
        try:
            value = parse_date(value)
        except DateFormatError:
            try:
                repo = self.options.repo
                if get_name(repo) == "mozilla-release" or (
                    not repo and re.match(r"^\d+\.\d\.\d$", value)
                ):
                    new_value = tag_of_release(value)
                    if not repo:
                        self.logger.info("Assuming repo mozilla-release")
                        self.fetch_config.set_repo("mozilla-release")
                    self.logger.info("Using tag %s for release %s" % (new_value, value))
                    value = new_value
                elif get_name(repo) == "mozilla-beta" or (
                    not repo and re.match(r"^\d+\.0b\d+$", value)
                ):
                    new_value = tag_of_beta(value)

def get_value(self):
        currentw = self.ui.stackedWidget.currentWidget()
        if currentw == self.ui.s_date:
            return self.ui.date.date().toPython()
        elif currentw == self.ui.s_release:
            return parse_date(date_of_release(str(self.ui.release.currentText())))
        elif currentw == self.ui.s_buildid:
            buildid = self.ui.buildid.text()
            try:
                return parse_date(buildid)
            except DateFormatError:
                raise DateFormatError(buildid, "Not a valid build id: `%s`")
        elif currentw == self.ui.s_changeset:
            return self.ui.changeset.text()

def get_value(self):
        currentw = self.ui.stackedWidget.currentWidget()
        if currentw == self.ui.s_date:
            return self.ui.date.date().toPython()
        elif currentw == self.ui.s_release:
            return parse_date(date_of_release(str(self.ui.release.currentText())))
        elif currentw == self.ui.s_buildid:
            buildid = self.ui.buildid.text()
            try:
                return parse_date(buildid)
            except DateFormatError:
                raise DateFormatError(buildid, "Not a valid build id: `%s`")
        elif currentw == self.ui.s_changeset:
            return self.ui.changeset.text()

if not repo:
                        self.logger.info("Assuming repo mozilla-release")
                        self.fetch_config.set_repo("mozilla-release")
                    self.logger.info("Using tag %s for release %s" % (new_value, value))
                    value = new_value
                elif get_name(repo) == "mozilla-beta" or (
                    not repo and re.match(r"^\d+\.0b\d+$", value)
                ):
                    new_value = tag_of_beta(value)
                    if not repo:
                        self.logger.info("Assuming repo mozilla-beta")
                        self.fetch_config.set_repo("mozilla-beta")
                    self.logger.info("Using tag %s for release %s" % (new_value, value))
                    value = new_value
                else:
                    new_value = parse_date(date_of_release(value))
                    self.logger.info("Using date %s for release %s" % (new_value, value))
                    value = new_value
            except UnavailableRelease:
                self.logger.info("%s is not a release, assuming it's a hash..." % value)
        return value