[TYPO3-calendar] Show in Legend only categories used this month

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Hi Mario

Am 10.01.2013 18:14, schrieb Mario Matzulla:
> Hi Patrick,
>>
> I see what you intend to do. And I think the module__marker described in
> the other thread is what you are looking for: a custom way to configure
> the category and calendar legend :)

Is there also a function that returns all the categories of events of 
the current month (or of any other defined period of time) ?

>
> Regards,
> Mario
>
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