Greek Orthodox Calendar of Holidays & Fasts

In answer to numerous requests from readers, the rule of fasting is given for each day of the year. Where no indication of fast is given, and during "fast-free weeks," all foods may be eaten (except during Cheese-fare Week, when meat alone is forbidden every day). Where "fast day" is indicated alone, the fast is a strict one, with no meat, eggs, dairy products, fish, wine or oil to be eaten. Where, underneath "fast day," is indicated "wine and oil allowed," the fast is relaxed for the sake of a feast day or vigil, to allow eating of these foods. Where "fish, wine and oil allowed" is indicated, then all three of these foods may be eaten.

The rule of fasting, which is dependent on the Church's cycle of feasts and fasts, is contained in the Church's Typicon, chiefly in chapters 32 and 33, and is repeated in the appropriate places of the Divine service books, the Menaia and Triodion. In general, fast days for Orthodox Christians are all Wednesdays and Fridays throughout the year (except for fast-free periods), the four canonical fast periods of Great Lent, Nativity Fast, Apostles' Fast, and Dormition Fast, and a few special days: the Exaltation of the Cross (September 14th) and the Beheading of the Forerunner (August 29th)—which, even though they are feast days, are also fast days (with wine and oil allowed) for the sake of the events commemorated thereon.

http://orthodoxinfo.com/praxis/father-seraphim-rose-fasting-rules.aspx