Final or interim dividend

Cilent's year end has passed 31 Oct 2012.  He wants to declare a dividend of £9k.  I know the profits will be more than enough to cover this but should it be classed as a final dividend for year ended 31 Oct 2012 or an interim dividend for 31 Oct 2013? Does it actually matter? Is there a time frame within which you must declare your final dividend?
Thanks