Hungary here. Can’t remember the exact wording of the law, but most employers only give out full days. My previous job, where I did rotating night shifts, counted the days that coincided with the start of the shift: if I had a paid day off on a Tuesday on a night shift week, I’d work from Monday 22:00 to Tuesday 6:00, stay at home on Tuesday, and start my next shift on Wednesday at 22:00 (just a hypothetical, I always tried to take full weeks).