[KBTKaiser]

okay...let's try to fix Ultragunner's train of thought...

Spoiler for okay let's start with...:

The magicians in england bit. If you've played Da Capo 2's game all the way to the end, the last scene of episode 13 post-credits should not be foreign to you.

Next, where to put DC3 on the timeline. This first cour of anime is 20 years after Da Capo 2, IIRC.

What we saw of Sakura throughout the anime series is, by my best guess, a magical construct reproduction of young sakura, age 11, 5 years before Da Capo 1, when she made her wish to the tree to stay as she was.

Now for the critical things.

Spoiler for too secret to explain without ruining plot:

Sakura Time Traveled backwards over a hundred years, due to a giant plot device that cannot be explained until they air the next season of anime and it comes to light there. Resolving the situation returned her to her time, though technically 5 years later as the DC2 bit for the upcoming DC3 game details.