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For the end of season date, I would add 1 day to the last day of the season. If there's a tie, there'll be a game that day, and MLB counts those stats as part of the regular season. If there is no tie, there will be no games that day. Of course, if you disagree with MLB, then don't add a day.
The date is used to help split traded player's stats. The bat_game file lists all games the player played, but it doesn't mark playoff games any differently. So, without knowing the end of season date, playoff stats would be add in with regular stats.
The beginning date is used to ignore trades that happened before the season. This was put in just to reduce processing time since pre-season trades don't need to be split.
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