The dates given in the blog are based on the calendar from the Forgotten Realms. Hammer is thus comparable to January, Alturiak February, and so on.

MonthNameCommon name
1HammerDeepwinter
2AlturiakThe Claw of Winter
3ChesThe Claw of the Sunsets
4TarsakhThe Claw of the Storms
5MirtulThe Melting
6KythornThe Time of Flowers
7FlameruleSummertide
8EleasisHighsun
9EleintThe Fading
10MarpenothLeaffall
11UktarThe Rotting
12NightalThe Drawing Down