Time travel

My Little Pony Friendship is Magic and its related materials occasionally feature or mention time travel.

Season two
It's About Time

Season five
Slice of Life

What About Discord?

The Cutie Re-Mark Pt. 1

Depiction in film
My Little Pony Equestria Girls: Friendship Games

Storybooks
The Journal of the Two Sisters

Commercials
Hot Minute with Twilight Sparkle

My Little Pony: Friendship is Magic (comics)
Friendship is Magic Issue 24

Merchandise
The Elements of Harmony pages 174-175

Enterplay: trading card series 1 card #54 "You're not scientifically possible!", series 2 card #56 Starswirl's Time Travel Spell, series 3 card #E46 It's About Time; collectible card game Equestrian Odysseys cards #52 C & #Pƒ9 Dr. Hooves, Time Researcher

WeLoveFine "Back to the past"