That is cool, thanks @christian.
However, I have tested it for months only and if I check a few manually added options they do not filter posts correctly. Selection of any two options for a month at the same time returns all the posts available. If I check them one by one, they work like they should. Probably something else should be corrected in JSON. I will experiment more with this tomorrow.
And I guess that disadvantage of this approach will be that we can not exclude empty option like with terms right?
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