Dating

Human 764, unification of Gilnas, other systems fell out of use centuries ago.
Elven 4567, earliest records of Ammangoan
Dwarven Traditional system from legendary first Emperor, Ironhand 9879.
Orcish N/A, too many debates
Draconic 17765, birth of the Dragon King, was more common as a reference point before trade increased with Tel Hazan, now only used for dating events before Ironhand 1.

I might get rid of this, it's a bit goofy, but real world month names are Roman in origin and can't really be explained in universe, unless I just do the "Month Number - ember" thing for every single month.

January - Vakop
February - Pidn
March - Dewns
April - Awop
May - Ioz
June - Slipens
July - Juluxis
August - Erot
September - Striarf
October - Rireg
November - Eam
December - Bryup

Alternate Idea, since Sirene's language is using Latin as a stand-in:

January - Unuary
February - Duenar
March - Vordea
April - Quarel
May - Quintilis
June - Sexten
July - Neptis
August - October
September - November
October - December
November - Undel
December - Eigengrau