THE 4 WAYS TO DATE LEGO BATMAN
LEGO Batman Timeline (LEGO Batman 1 dates)
1988 - LEGO Batman: Legacy of the Dark Knight
2008 - LEGO Batman: The Video Game - Hero Episode 1
2008 - LEGO Batman: The Video Game - Villain Episode 1
2008 - LEGO Batman: The Video Game - Hero Episode 2
2008 - LEGO Batman: The Video Game - Villain Episode 2
2008 - LEGO Batman: The Video Game - Hero Episode 3
2008 - LEGO Batman: The Video Game - Villain Episode 3
2009 - LEGO Batman 2: DC Super Heroes - Main Game
2009 - LEGO Batman 2: DC Super Heroes - Bonus Level
2010 - LEGO Batman 3: Beyond Gotham - Main Story + Bonus Levels
2011 - LEGO Dimensions - DC Comics
2018 - LEGO DC Super Villains - Main Story + Bonus Levels
LEGO Batman Timeline (The Dark Knight Trilogy Dates)
2005 - LEGO Batman: Legacy of the Dark Knight
2025 - LEGO Batman: The Video Game - Hero Episode 1
2025 - LEGO Batman: The Video Game - Villain Episode 1
2025 - LEGO Batman: The Video Game - Hero Episode 2
2025 - LEGO Batman: The Video Game - Villain Episode 2
2025 - LEGO Batman: The Video Game - Hero Episode 3
2025 - LEGO Batman: The Video Game - Villain Episode 3
2026 - LEGO Batman 2: DC Super Heroes - Main Game
2026 - LEGO Batman 2: DC Super Heroes - Bonus Level
2027 - LEGO Batman 3: Beyond Gotham - Main Story + Bonus Levels
2028 - LEGO Dimensions - DC Comics
2035 - LEGO DC Super Villains - Main Story + Bonus Levels
LEGO Batman Timeline (DC Animated Universe dates)
1983 - LEGO Batman: Legacy of the Dark Knight
2003 - LEGO Batman: The Video Game - Hero Episode 1
2003 - LEGO Batman: The Video Game - Villain Episode 1
2003 - LEGO Batman: The Video Game - Hero Episode 2
2003 - LEGO Batman: The Video Game - Villain Episode 2
2003 - LEGO Batman: The Video Game - Hero Episode 3
2003 - LEGO Batman: The Video Game - Villain Episode 3
2004 - LEGO Batman 2: DC Super Heroes - Main Game
2004 - LEGO Batman 2: DC Super Heroes - Bonus Level
2005 - LEGO Batman 3: Beyond Gotham - Main Story + Bonus Levels
2006 - LEGO Dimensions - DC Comics
2013 - LEGO DC Super Villains - Main Story + Bonus Levels
LEGO Batman Timeline (Gotham Globe dates)
2025 - LEGO Batman: Legacy of the Dark Knight
2045 - LEGO Batman: The Video Game - Hero Episode 1
2045 - LEGO Batman: The Video Game - Villain Episode 1
2045 - LEGO Batman: The Video Game - Hero Episode 2
2045 - LEGO Batman: The Video Game - Villain Episode 2
2045 - LEGO Batman: The Video Game - Hero Episode 3
2045 - LEGO Batman: The Video Game - Villain Episode 3
2046 - LEGO Batman 2: DC Super Heroes - Main Game
2046 - LEGO Batman 2: DC Super Heroes - Bonus Level
2047 - LEGO Batman 3: Beyond Gotham - Main Story + Bonus Levels
2048 - LEGO Dimensions - DC Comics
2055 - LEGO DC Super Villains - Main Story + Bonus Levels
My LEGO DC games interpretation:
1981 - LEGO Batman 3: Beyond Gotham (Man of Steel)
2005 -
LEGO Batman: Legacy of the Dark Knight
2008 - LEGO Batman 3: Beyond Gotham (Arrow)
2008 - LEGO Batman 3: Beyond Gotham (Dark Knight Trilogy)
2008 -
LEGO Batman: The Video Game
2012 -
LEGO Batman 2: DC Super Heroes
2013 - LEGO DC Super-Villains (Mask of the Phantasm)
2014 -
LEGO Batman 3: Beyond Gotham
2014 - LEGO Batman 3: Beyond Gotham (Batman 75th Anniversary)
2015 - LEGO Batman 3: Beyond Gotham (Bizarro)
2015 - LEGO Batman 3: Beyond Gotham (The Squad)
2015 -
LEGO Dimensions
2016 - LEGO DC Super-Villains (The Summit)
2018 -
LEGO DC Super-Villains
2018 - LEGO DC Super-Villains (Ring of Fire)
2018 - LEGO DC Super-Villains (The Final Battle)
2018 - LEGO DC Super-Villains (Sivana Escape)
2018 - LEGO DC Super-Villains (Sivana Showdown)
It's quite easy to narrow down most of the DLCs to the exact dates their non-LEGO versions take place at, except for Mask of the Phantasm. I've push it up 20 years into the future just to make it work. Obviously, "Batman 75th Anniversary" likely takes place on March 30th, 2014.
Fun fact, K-9 (LBTVG), a red TARDIS (LB3BG) and Weeping Angels (LB3BG) are all native to this universe.