By exact dates I assume you mean to the exact day. The Greeks held games every year and used that as their dating (historians have determined, accurately I am assuming, that the '3rd year of the 23rd Olympiad' for example was 436 B.C.). The Romans kept the games going, and went according to Greek dating, IOW held them yearly per Greek tradition, and later on the Julian calendar came into use. So can't we say that all this, combined with certain religion festivals and observances which were held on specific dates, and the well-recorded lunar phases , that dating Greek events is fairly accurate at least to the month and perhaps even week?
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