Updated for Avengers: Endgame. No need to spoiler tag anymore since the Russos lifted the spoiler ban.
If we assume that Infinity War takes place a week or two after Ant-Man and the Wasp, this means that Stark and Nebula are rescued by Danvers in early June 2018, since it's been 22 days since the snap.
The 2012 events may have created an alternate timeline, while the 2014 events almost certainly did. The events in 2013 and 1970 didn't necessarily create alternate timelines. However, until more concrete information is given, I have decided to list all of the time travel events (including 1948) as alternate timelines.
The film confirms Doctor Strange's placement in 2017, since the Ancient One tells Hulk in 2012 that he's five years too early to find him.
Also, there's nothing in the movie that contradicts The Cosmic Quest - Volume Two: Aftermath, since Selvig is only missing, not confirmed dead.
To differentiate the different timelines, I listed the alternate timeline from Agents of S.H.I.E.L.D. season 5 as "Quake Timeline".