Looking back, I realized that there were some movies taking place in the 21st century, such as the "I Can Only Imagine" film from 2018 that I wanted to incorporate into the series. So, that was when I came up with an idea for what year the Equestria Girls travel from:

In the 22nd century, from the years 2159 and 2160, the latter year being when they'd graduate from school. I figured that would help give a pretty good gap for the girls to travel from.

Any thoughts on this?