According to Greek Law every Sunday of the year is a public holiday. In addition, there are four obligatory, official public holidays: March 25 ("Greek Independence Day"), Easter Monday, August 15 ("Assumption or Dormition of the Holy Virgin") and December 25 ("Christmas"). Two more days, May 1 ("Labour Day") and October 28 ("Ohi Day"), are regulated by law as optional but it is customary for employees to be given the day off. There are, however, more public holidays 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 Holidays rarely changes and has not changed in recent decades, giving a total of eleven National Holidays each year.