One of the big efforts I'm trying to make in my Forbidden Wilderlands campaign is to keep proper track of time. I'm using a modified version of the Wilderlands of High Fantasy calendar as follows:
BALOZKINAR’S CORRECTED COMMONERS’ CALENDAR
Current Year: 4433 BCCC
The days of the Week:
There are six weeks in a month with a week long festival at the end of the year.
(December) Year's End