When does baseball season officially start and end?

Also, is it the same exact thing for little league? When is the Baseball World Series Game? Does the little league have a game equivalent to the world series? What's an all-star game?|||It starts in early April and ends in October after the World Series (as the person above me said, there is no pre-determined date). Little League starts around the same time, but ends much earlier, in May or June (all-star team plays in July). There is a Little League World Series, which consists of Little League All-Star teams from around the country that have already won their district, sectionals, and states. It is being played now, actually. The MLB All-Star game is an annual game in July in which the best players from both leagues play against each other (National League vs. American League). Fans vote for the position players that make the team, and the pitchers and reserves are chosen by the managers. The league that wins the All-Star game gets home field advantage in the World Series.|||no pre-determined start; it's up to Commish's office. WS final game determines when it's over.|||starts in april, ends in october - MLB