Significant Dates in Baseball History
| Date | Description |
| 1899-08-11 | American League is formed |
| 1900-03-21 | St. Paul Saints of the Western League moved to Chicago and renamed White Stockings |
| 1900-04-21 | Chicago White Stockings renamed White Sox |
| 1901-01-28 | American League declared itself to be a second major league |
| 1901-04-24 | First "official" American League game is played |
| 1903-03-12 | New York Highlanders approved as member of the American League |
| 1913-04 | New York Highlanders renamed Yankees |
| 1961-03-06 | New York Mets admitted to National League as an expansion team |
| 1968-05-27 | MLB awarded expansion franchises to Montreal (Expos) and San Diego (Padres) |
| 1970-04-01 | Seattle Pilots moved to Milwaukee and renamed Brewers |
| 1992-11-17 | MLB expansion draft (Colorado Rockies, Florida Marlins) |
| 1997-11-18 | MLB expansion draft (Arizona Diamondbacks, Tampa Bay Devil Rays) |
| 1999-06-02 — 1999-06-03 | 1999 MLB First-Year Player Draft |
| 2001-06-05 — 2001-06-06 | 2001 MLB First-Year Player Draft |
| 2001-06-04 — 2001-06-05 | 2002 MLB First-Year Player Draft (rounds 1-22 on day 1, rounds 23-50 on day 2) |
| 2004-09-29 | Montral Expos moved to Washington D.C. |
| 2004-11-22 | Washington Expos renamed Nationals |
| 2006-06-06 — 2006-06-07 | 2006 MLB First-Year Player Draft |
| 2007-06-07 — 2007-06-08 | 2007 MLB First-Year Player Draft |
| 2007-11-08 | Tampa Bay Devil Rays renamed Rays |
| 2008-06-05 — 2008-06-06 | 2008 MLB First-Year Player Draft (rounds 1-6 on day 1, rounds 7-50 on day 2) |
| 2009-06-09 — 2009-06-11 | 2009 MLB First-Year Player Draft (rounds 1-3 on day 1, rounds 4-30 on round 2, rounds 31-50 on day 3) |
| 2010-06-07 — 2010-06-09 | 2010 MLB First-Year Player Draft (rounds 1 and compensatory A on day 1, rounds 2-30 on day 2, rounds 31-50 on day 3) |
| 2011-06-08 — 2011-06-08 | 2011 MLB First-Year Player Draft |
| 2012-06-04 — 2012-06-06 | 2012 MLB First-Year Player Draft |
| 2013-06-06 — 2013-06-08 | 2013 MLB First-Year Player Draft (rounds 1-2 on day 1, rounds 3-10 on day 2, rounds 11-40 on day 3) |
| 2014-06-05 — 2014-06-07 | 2014 MLB First-Year Player Draft (rounds 1-2 on day 1, rounds 3-10 on day 2, rounds 11-40 on day 3) |
| 2015-06-08 — 2015-06-10 | 2015 MLB First-Year Player Draft (rounds 1 - competitive balance B on day 1, rounds 3-10 on day 2, rounds 11-40 on day 3) |
| 2016-06-09 — 2016-06-11 | 2016 MLB First-Year Player Draft (rounds 1 - competitive balance B on day 1, rounds 3-10 on day 3, rounds 11-40 on day 3) |
| 2017-06-12 | 2017 MLB First-Year Player Draft, Rounds 1 - competitive balance round B |
| 2017-06-13 | 2017 MLB First-Year Player Draft, Rounds 3 - 10 |
| 2017-06-14 | 2017 MLB First-Year Player Draft, Rounds 11 - 40 |
| 2018-06-04 | 2018 MLB First-Year Player Draft, Rounds 1 - competitive balance round B |
| 2018-06-05 | 2018 MLB First-Year Player Draft, Rounds 3 - 10 |
| 2018-06-06 | 2018 MLB First-Year Player Draft, Rounds 11 - 40 |
| 2019-06-03 | 2019 MLB First-Year Player Draft, rounds 1 - compensation round B |
| 2019-06-04 | 2019 MLB First-Year Player Draft, rounds 3-10 |
| 2019-06-05 | 2019 MLB First-Year Player Draft, rounds 11-40 |
| 2020-06-10 | 2020 MLB First-Year Player Draft, (rounds 1 - competitive balance round A |
| 2020-06-11 | 2020 MLB First-Year Player Draft, rounds 2 - 5 |
| 2021-07-11 | 2021 MLB First-Year Player Draft, rounds 1 - competitive balance round A |
| 2021-07-12 | 2021 MLB First-Year Player Draft , rounds 2-10 |
| 2021-07-13 | 2021 MLB First-Year Player Draft , rounds 11-20 |
| 2022-07-17 | 2022 MLB First-Year Player Draft rounds 1 - compensation round B |
| 2022-07-18 | 2022 MLB First-Year Player Draft, rounds 3-10 |
| 2022-07-19 | 2022 MLB First-Year Player Draft, rounds 11-20 |