No but they had a clean year of 12 months, 30 days each (3 ten-day weeks) plus 5/6 holiday days at the end of the calendar (around the September equinox).

Also, the months were given names by a Poet, and the days had minerals, vertues or plants instead of Saints. The calendar itself was pretty cool.

Honestly, if they had 5 weeks of 6 days each instead of the 3 weeks of 10 days, I'd even call it the perfect calendar.