In Tuesday December 25th Ukraine will celebrate Catholic Christmas. This holiday became a national last year that means an official day of rest for the whole country. Cristmas Eve will be the day off as well, however, this working day is postponed to the prior Saturday, December 22.
In the same way Ukraine celebrates New Year. Last working day in the year December 31th will be the day off, but instead of it Ukrainians will work at Saturday December 29th.