So we start the episode the day of William Kaplan's bar mitzvah (13th bday) which is also the same day when Wanda drops the Hex over Westview and leaves (so 10th Nov 2023)
We then skip to a few days or a week since the accident as Billy is eating in the hospital and there are loads of get well soon balloons and his parents feel like he can finally come home after such a long time (So anywhere from 12th to the 17th Nov 2023) we then skip to the next day when Billy is being taken home to Eastview. (So between the 13th - 18th Nov 2023)
We then time jump 3 years later and it's already been Billy's 16th Bday (10th Nov 2026) as in episode 2 Billy tells Agatha he's 16 and not a lot of time passes between the rest of the episode and when we connect back to episode 2 from Billy's perspective.
So we are now with Billy and his bf in the car at night
(So between the 13th - 18th Nov 2026)
before meeting up with Ralph Bohner the following night (So between the 14th - 19th Nov 2026) and connecting back to the events of episode 1 from Billy's perspective in the Late night/early morning of somewhere between 14/15,15/16,16/17,17/18,18/19,19/20th Nov 2026)
So far Agatha All Along starts soon after 10th November 2026 (Estimated between 14th - 19th and is currently occurring around the 21st November 2026