I have been extolling the virtues of this for years.

A global day off on NYD and every four years two days off. Really nice!

23:59 28/13/xxxx -> 00:00 NYD -> 23:59 NYD -> 00:00 01/01/xxx(x+1)
or 23:59 28/13/xxxx -> 00:00 NYD -> 23:59 NYD -> 00:00 ENYD -> 23:59 ENYD -> 00:00 01/01/xxx(x+1)