When did the Persian war begin and end?

There was no defined First, Second, Third etc. Some people say one war, some say two, some say three.

It is best described as a war with different phases:

Ionian Revolt 499-493 BCE

Persian punitive expedition agains Eretria and Athens 490 BCE

Persian invasion of peninsular Greece 480-479 BCE

Delian League counter-offensive 478-449 BCE.