There is a general national framework for shop opening hours (in principle earliest opening at 05:00 and closing time at 21:00 Monday to Friday, 20:00 on Saturdays). Exceptions are made for a certain category of usually small shops during Sundays, when all stores are normally closed. The Prefecture may also authorize other exemptions depending on circumstances. With the new amendment there are more shops that have the possibility to be open on Sundays depending on their municipality (for example the ones of Athens and Piraeus can be open on Sundays from May to October)For unofficial version see: http://www.taxheaven.gr/laws/law/index/law/76 http://www.taxheaven.gr/laws/law/index/law/247 http://www.taxheaven.gr/laws/law/index/law/531