Thought I would make a list of a few important dates before Season 2 of The Mandalorian begins.

The Mandalorian
Since we see a super battle droid when Din Djarin is rescued as a child, I think this time period is during the Clone Wars, sometime after the end of Attack of the Clones when we first see them and the end of Revenge of the Sith when the war ends and they are shut down. (22BBY - 19 BBY)

The Clone Wars
21 BBY - Darth Maul kills Pre Vizla on Mandalore and takes the Darksaber

Rebels
2 BBY - Sabine (with Kanan and Ezra) obtains the Darksaber from Maul on Dathomir

2 BBY - Sabine gives Bo-Katan the Darksaber to reunite the clans

THE GREAT PURGE - Mandalore resists Imperial control

The Mandalorian
9 ABY - Moff Gideon uses the Darksaber on Nevarro

*Ahsoka was born 36 BBY, so she would be 45 years old during The Mandalorian. (9 ABY)

*I know Maul loses and obtains the Darksaber again, and that is covered in the comics, but I just listed the most important dates (in my opinion).