change item state from template source code

Is it possible to change the state of an item from the category or item template source?
I use a category to show events. With extra fields I set up start and end dates.
If the event is in the past, I want the template to check this. If yes I don't want to show this event(s) anymore and for the next time the category is loading this items shouldn't be loaded because of changing its state(s).
Can anyone give an example? A example working for native Joomla doesn't consider all aspects of Flexicontent 
Regards
 

hello you can do it without any code
you can use a blocker filter in your date field
read tis tutorial
www.flexicontent.org/documentation/tutor...blication-dates.html

Thx,
can you explain how to configure a category filter for the backwards years, e.g. 2021,2022,2023 to show only items created that specific year?
Is it possible to use the "created" date instead of custom date fields?
Regards

hello
you can't use created date for this but you can use coreprop field to link a custom date to created date
you can select the date mode on filter tab

Thanks micker,
is it right, that there's no simple workflow to filter a category and its items by year based on creation date?
I mean without creating a new core prop date field and locked filters?

without some work not easier
1 create a core prop and link to joomal date
2 allow filter and change display to group with year
etc ..
Maybe i can be moresimplier to use subcategory (one peer year) ?