� M�h � � � d � Z y)c � � t t | � d� \ }}t t |� dz � }| dk\ rd}nd}dj |t |� t |� � S )z� Return a string representing the timezone offset. Remaining seconds are rounded to the nearest minute. >>> format_timezone(3600) '+01:00' >>> format_timezone(5400) '+01:30' >>> format_timezone(-28800) '-08:00' i �<