According to Greek law, every Sunday of the year is a public <answer>holiday</answer>. In addition, there are four mandatory official public <answer>holiday</answer>s: 25 March (Greek Independence Day), Easter Monday, 15 August (Assumption or Dormition of the Holy Virgin), and 25 December (Christmas). 1 May (Labour Day) and 28 October (Ohi Day) are regulated by law as being optional but it is customary for employees to be given the day off. There are, however, more public <answer>holiday</answer>s celebrated in Greece than are announced by the Ministry of Labour each year as either obligatory or optional. The list of these non-fixed national <answer>holiday</answer>s rarely changes and has not changed in recent decades, giving a total of eleven national <answer>holiday</answer>s each year.
Greek law says that every Sunday of the year is a what?
holiday