Normally, one would assume that the timeline is pretty clear: Frozen, Frozen Fever, Olaf's Frozen Adventure. But that doesn't seem to be the case.

Here are some facts:

• Events of Frozen are happening during July¹

• Anna was born during the sommer solstice^2. The sommer solstice is always on June 20th, 21st or 22nd^3.

• The plot of Frozen Fever revolves around Anna's Birthday⁴ ,which means Frozen Fever is happening almost a year after the events of Frozen

• Olaf's Frozen Adventure is set only 6 months after Frozen. An excerpt of Lyrics of the song Ring in the Season⁵ in the featurette:

Anna: ♪ It's the first christmas in forever ♪

Elsa: ♪ since we opened up the gates ♪

• Conclusion: Olaf's Frozen Adventure is set before Frozen Fever:

1: Frozen (July)

2: Olaf's Frozen Adventure (December, same year)

3: Frozen Fever (June, the following year)