Here is my personal view of the DCAU Timeline. Keep in mind, I haven't seen all of them, so this is just the shows I have seen, or at least information from between series.
Continuity in series
Batman: The Animated Series (1992 - 1995)
- On-Screen Dates
- Distance between Series
- Cultural References
- Comic - Tiny Toon Adventures Magazine (1990 - 1992)
Superman: The Animated Series (1996 - 2000)
- On-Screen Dates
- Distance between Series
- Cultural References
The New Batman Adventures (1997 - 1999)
- On-Screen Dates
- Distance between Series
- 1 month after "World's Finest" ("Joker's Millions")
- Cultural References
Batman Beyond (1999 - 2001)
- On-Screen Dates
- Distance between Series
- 6 days after Infiltration Unit Zeta went rogue. ("Zeta")
- Cultural References
- Movie - The Wizard of Oz (1939)
Static Shock (2000 - 2004)
- On-Screen Dates
- Distance between Films
- Cultural References
The Zeta Project (2001 - 2002)
- On-Screen Dates
- August 5, 2041 (computer screen)
- Distance between Series
- Cultural References
Justice League (2001 - 2004)
- On-Screen Dates
- Distance between Films
- Cultural References
Justice League Unlimited (2004 - 2006)
- On-Screen Dates
- Distance between Films
- Cultural References
Continuity in films
Batman: Mask of the Phantasm (1993)
- On-Screen Dates
- Distance between Films
- Cultural References
Batman & Mr. Freeze: SubZero (1998)
- On-Screen Dates
- Distance between Films
- Cultural References
Batman Beyond: Return of the Joker (2000)
- On-Screen Dates
- Distance between Films
- Cultural References
Batman: Mystery of the Batwoman (2003)
- On-Screen Dates
- Distance between Films
- Cultural References
Batman and Harley Quinn (2017)
- On-Screen Dates
- Distance between Films
- Cultural References
Justice League vs. The Fatal Five (2019)
- On-Screen Dates
- Distance between Films
- Cultural References