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)Batman: Mask of the Phantasm (1993)Superman: The Animated Series (1996-2000)The New Batman Adventures (1997-1999)Batman & Mr. Freeze: SubZero (1998)Batman Beyond (1999-2001)Batman Beyond: Return of the Joker (2000)Static Shock (2000-2004)The Zeta Project (2001-2002)Justice League (2001-2004)Batman: Mystery of the Batwoman (2003)Justice League Unlimited (2004-2006)Batman and Harley Quinn (2017)Justice League vs. The Fatal Five (2019)Timeline 
