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The Symmetry010 calendar (Sym010) is a proposal for calendar reform created by Irv Bromberg of the University of Toronto, Canada. It is a perennial perpetual solar calendar that conserves the traditional month pattern and 7-day week.

It is symmetrical across and between quarters, hence the name. Its identical quarters each have 3 months with 30+31+30 = 91 days.

Every quarter starts on Monday. The current setting for leap years has the Leap Week ("Irvember") as a stand-alone week after December.

By having either 364 or 371 days per year, the Symmetry010 Calendar is perpetual yet conserves the traditional 7-day weekly cycle.

Calendar year
The proposed calendar is laid out as follows:


 * The last 7 days of December, shown in red, are intercalary days that are appended only to the end of leap years.

Epoch
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