> My question is .. should they return midnight? 
> If its noon on the 4th 
> July and we ask for 'next' or 'set' do we 
> include the current? 
> Probably not. 

agree.

> But if we return midnight, does
> 'previous' return the 
> current? Really shouldn't.

agree.
- next() returns ">",
- prev() returns "<".
- is() returns yes-no (???)

> What does a multi-day event return? For example, 
> we could use the 
> timezone to determine 'season' .. does 
> previous return the last day 
> of the previous season? Does 'next' return 
> the first of the next ...

$spring_spanset = $spring_set->until( $summer_set );
$span = $spring_spanset->next;  
$start = $span->start;
$end = $span->end;



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