The Death of Socrates

Do we know the date that Socrates died, such as the day, month and year? I know that an execution was forbidden at that time until the ship returned from Delos, so perhaps that can give us some idea.

Hm, I've never heard of any specific date being given. Notations or even estimations of those don't usually start appearing until about the first century BCE. I would say it is probably doubtful that anybody kept that specific of a record to include the month or day. However, most scholarly sources I know of place the trial and execution, based on historical details, at some time in what would be, for us, the earlier end of the 390's BCE.