Greece operates two hours ahead of Greenwich Mean Time and also operates summer time-moving the clocks one hour forward during the summer.

1 January: New Years Day or Protochronia
6 January: Epiphany.
25th March: Greek Independence Day.
1 May: May Day.
I5th August: Assumption of the Virgin.
28th October: National "No" or "Ochi" Day.
25th December: Christmas Day.
26th December: St: Stephens Day.

Moveable dates centre around the Easter celebrations with the first day of Lent (Clean Monday), Good Friday, Easter Monday, the Ascension and Holy Monday (Whit Monday). They change with each calendar year.