Bloodraven
Sergeant at Arms
Art of Justice said:Is it the same as IRL, but with winter being able to last for years?
Apparently, yes. GRRM always managed to avoid naming a specific month or day, but the context shows that the calendar used in Westeros and its time spans resemble our own (like the lunation or day-time).
So you would have to come up with your own names for days and months. Or just leave it the way it is. I dunno.