>>120127No it doesn't.
"Dobry den" as it's written is Czech (you could argue Slovak due to lack of diacritics)
The closest to it outside of these two would be the Russian добрый день (dobryj deň), but already there is a difference due to Russian using 'j' to make the 'y' longer, not to mention that it isn't as used as other greetings like "privet" or "zdrastvujte"
>anon's first post covers at least 3 slav languagesRussian and Ukrainian which are in the same dialectical continuum.