In the Fixed Festivity Week Calendar, after each quarter there is a full holiday week dedicated to several festivities, some of which are based on the European mix of Christian and older traditions, others are purely secular. Nations may move the holiday week from after the last month of a quarter to before any of the three months; this should happen for all quarters in the same way. Employees do not get paid holidays in any other week.
The date format is
Q-M-W-D, with the holiday week having the quarter and month number zero:
0-0-W-D, which may be shortened to
0-H-D, e.g. the leap week then is 0-5.