When is a started MLB game restarted vs continued after being stopped due to weather?

I've read the MLB rules on suspended and postponed games, but I did not see anything about restarting a game at a later date after it has been stopped. I thought they just resumed where they left off. After 5 innings, does the game count as a complete game, or is that when they resume play? Please advise!! Please do not copy an answer from a rulebook. I've read the rulebook and I'm still confused.