I'm sure the event timeline is in the Avengers art book. Or there is a picture of it online to get the exact timescale each movie took place.
This is the Phase 1 "timeline" from the Art of Avengers book:
http://cdn3-www.superherohype.com/assets/uploads/2013/01/file_174511_3_timelinehuge.jpg
Phase 2 Official Order
Captain America: Winter Soldier
Iron Man 3
Thor: Dark World
Guardians of the Galazy
Avengers: Age of Ultron
That is most certainly not the "Official" order (there is no way Winter Soldier is before IM3 and Thor:TDW). Official order is release order. Chronological order, in the case of Phase 2, is also release order. Agents of SHIELD helps solidify this
Iron Man 3, New Years Eve party is December 1999 going into the year 2000, the bulk of the film takes place 13 years later. December 1999 + 13 years = December 2012 (approx. 6 months post Avengers)
*Personally I ignore the date on the newspaper the kid hands Tony as newspapers can make typos.
--- Agents of SHIELD episodes 1-7 happen some time (months/weeks?) prior to Thor:TDW (first episode indicates that Extremis and it's instability are known about - indicating it starts after the events of IM3)
Thor: The Dark World takes place at least a year after Avengers. Darcy mentions it's been about 2 years since the first Thor movie, and knowing that Avengers happened a year after the first Thor movie (personally, given that I doubt there's a full year between episodes 8 & 16 in Agents of SHIELD, I'd say that this also happens more in 'real time' - so maybe a little closer to a year and a half after Avengers - and so is in late fall-ish 2013)
--- Agents of SHIELD episodes 8-16 (ep. 8 showing team dealing with the London cleanup. Ep. 16 beginning to bump into events of Winter Soldier)
Captain America: The Winter Soldier is approx. 2 years post Avengers (via interviews indicating it had been a couple years since Cap was thawed and Scarlett mentioned in an interview the film takes place more in 'real time')
--- Agents of SHIELD episodes 17-22 (dealing with fallout of Winter Soldier)
Guardians of the Galaxy takes place at some unspecified point in the Earth year 2014 [BLACKOUT]Peter Quill is taken as a child in 1988 and the rest of the film takes place 26 years later, ergo 2014[/BLACKOUT]