Timeline of events? Can someone help me out?

Can someone help me out? I am really struggling to understand the timeline of events.

A little spoilery.

Fourth Wing. The timeline was clear. Iron Flame starts just before they graduate.

But from there it's a bit wooly for me. They're still in their second year and a considerable amount of stuff has happened.

From Aaric and Sloane joining on conscription day all the way through to the end of this book. Including Xaden being stationed at Samara and RSC course and Varrish incident. I can't understand in my head. As IF and OS is almost 1 years across 2 books?

Threshing is 1st Oct for Aaric etc. We see Violet give Xaden a birthday present in OS (March).

So in 4 months, they have gone to Aretia with the riot. Come back for end of IF. Signed the agreement. Visited some Isles. All before March?

I also can't put a time frame between that and where the book ends?

I'm sure there are probably some more references to dates in the book. They must be technically be almost 3rd year's at the start of the 4th book?