Well I though this was pretty cool so I will share it for the hell of it

At the begining of the second City(the country side one) you work for "Catalina"(the girl who shoots the main character in the face with a shotgun in GTA III).

Well you sorta date her but after you complete the 4 missions you do with her you race her and a few other people in one of Ceaser missions, and who might you ask one of the people is....the main character of GTA III!!!

I really couldn't beleive my eyes but the story now comes together...I am guessing right after this they head to Liberty City and he get's blasted in the face by his love

Well if the begining events of GTA III takes place after San Andreas then we now the date of III (1992).