czynymi
Czynymi is not a widely recognized entry in standard Polish dictionaries or encyclopedias. In contemporary usage, it does not correspond to a widely attested lemma, and it is likely a misspelling or a nonstandard form related to other Polish words with similar roots.
One possible source of confusion is the adjective czynny, meaning active or in operation. The standard inflected
Another related word is czyn, meaning deed or act. The plural czyny marks the nominative plural (deeds),
In practice, if you see dnia form czynymi in a text, it is advisable to check the