I will start with disclaimers: I have not seen Avengers Infinity War yet, and I don't know when exactly I will watch it. I will post an update to this once I have seen this movie. Until then, please don't spoil Infinity War. Research was hard enough while trying to avoid the movie's spoilers.
Speaking of spoilers, this WILL include spoilers for all the other MCU movies (including Black Panther), but not the shows (except Agents of SHIELD Season 1 and 2 for dating Cap 2), I haven't watched them all, so I will not include most of the shows or 1-shots to this post.
This is a topic I've been thinking over for a while. Since the release of Spiderman Homecoming, the internet has blown up with, "Spiderman Homecoming breaks the MCU Timeline!" "Will Infinity War fix the MCU Timeline?" "Since The Avengers took place in 2012, does that mean Spiderman Homecoming takes place in 2020?"
While watching my MCU marathon for Infinity War, I've found the answer! The MCU Timeline was NEVER broken! The time