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Perfectionist's month

It's already March! The February is already gone and I almost forgot to write the curious property it had this year: a perfect 4 weeks from start to finish of the month forming perfect rectangle on the calendar. Of course this doesn't apply to those odd people considering any other day than Monday as a start of the week.

Of course this isn't that rare occurrence. Most of the Februaries are exactly four weeks long and as the days in the year isn't divisible by seven the days move around over years in a cyclical manner. Of course, for the joy of all those doing datetime math this isn't that straight forward either. It doesn't happen every 7 years for example as there are the leap years causing anomalies to the cycles. Instead, it usually happens every 11 years when there is two leap year in between. But that would be too perfect as well. On top of that there are also some special rules for the leap years as well. But all taken into account these perfect months happen on average every 9 years. Next one happening already 6 years from now in 2027.