Sept. 1 -- Active rosters expand to 40 players.
Oct. 5 -- Postseason begins, wild-card playoffs.
Oct. 6 -- Division series begin.
Oct. 13 -- League championship series begin.
Oct. 24 -- World Series begins, city of National League champion.
November TBA -- Deadline for teams to make qualifying offers to their eligible former players who became free agents, fifth day after World Series.
November TBA -- Deadline for free agents to accept qualifying offers, 12th day after World Series.
Nov. 7-9 -- General managers meetings, Indian Wells, Calif.
Dec. 2 -- Last day for teams to offer 2013 contracts to unsigned players.
Dec. 3-6 -- Winter meetings, Nashville, Tenn.
Jan. 15 -- Salary arbitration filing.
Jan. 18 -- Salary arbitration figures exchanged.
Feb. 1-21 -- Salary arbitrating hearings, Phoenix.
Feb. 14 -- Voluntary reporting date for pitchers, catchers and injured players (tentative).
Feb. 19 -- Voluntary reporting date for other players (tentative).
Feb. 26 -- Mandatory reporting date (tentative).
March 2-11 -- Teams may renew contracts of unsigned players.
March 13 -- Last day to request unconditional release waivers on a player without having to pay his full 2013 salary (tentative).
March 27 -- Last day to request unconditional release waivers on a player without having to pay his full 2013 salary (tentative).
March 31 -- Opening day. Active rosters reduced to 25 players (tentative).
July 16 -- All-Star game, Citi Field, New York.
Dec. 9-12 -- Winter meetings, Lake Buena Vista, Fla.
Copyright 2012 by The Associated Press
This story is from ESPN.com's automated news wire. Wire index
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