if param:

                time_params[name] = int(param)

        return datetime.timedelta(**time_params)

    def _extract_date(self, name):

        """

        Extract the date part from rm__<date> pattern of removed repos,

        and convert it to datetime object

        :param name:

        """

        date_part = name[4:19]  # 4:19 since we don't parse milliseconds

        return datetime.datetime.strptime(date_part, '%Y%m%d_%H%M%S')

    def command(self):

        #get SqlAlchemy session

        self._init_session()

        repos_location = Ui.get_repos_location()

        to_remove = []

        for dn_, dirs, f in os.walk(safe_str(repos_location)):

            alldirs = list(dirs)

            del dirs[:]

            if ('.hg' in alldirs or

                'objects' in alldirs and ('refs' in alldirs or 'packed-refs' in f)):

                continue

            for loc in alldirs:

                if REMOVED_REPO_PAT.match(loc):

                    to_remove.append([os.path.join(dn_, loc),

                                      self._extract_date(loc)])

                else:

                    dirs.append(loc)

            if dirs:

                print 'Scanning: %s' % dn_

        #filter older than (if present)!

        now = datetime.datetime.now()

        older_than = self.options.older_than

        if older_than:

            to_remove_filtered = []

            older_than_date = self._parse_older_than(older_than)

            for name, date_ in to_remove:

                repo_age = now - date_

                if repo_age > older_than_date:

                    to_remove_filtered.append([name, date_])

            to_remove = to_remove_filtered

            print 'Removing %s deleted repos older than %s (%s)' \