User blog comment:SayuriDarling/The Sword of Summer Official Discussion/@comment-5183385-20151007031418/@comment-24883778-20151021192714

So if it is January 13th, 2011, the dates mentioned by Freya completely don't match. February 2011 does match, however. Unless time in Hotel Valhalla flows differently... the dwarves mention "Midgard hours" so it's fair to assume Nine World have nine different passages of time.