Board Thread:WARNING ALL USERS False Info\Spoilers/@comment-6383956-20140308192941/@comment-24989948-20140924035707

Kali, Enis, Boyd and Jennifer Blake were listed as having died in 2012, yet at the beginning of Season 3, a mere four months went by. The Nogitsune story takes place a few weeks afterward, but they celebrate Halloween in the episide Illuminated. That is the central basis of my answer. It is acknowledged that actual dating within the program  is exaggerated and uses a different  dating system for full moons. In episoe one, Scott is bitten on a January 9. In reality, school started (should have) January 3 and the actual full moon on January 19.

Teen Wolf is not the only show to alter events to fit a storyline. The easiest option is sit down and examine the progression of storylines and arcs to create a timeline.