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Octalendar

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The Octalendar is a perpetual leap week calendar design that divides the year into 8 months of exactly 6 or 7 weeks, alternating 7:6. That means, every odd month has 49 days and every even month has 42 days, except for the last, eighth one in leap years when it has 49 days instead.

The date format is ISO-like ±YYYY-M-W-D. All usual date conventions comply with ISO 8601, i.e. weeks start on Monday and the leap week depends on the Gregorian leap rule and year count.

Two adjacent months can be grouped to form a quarter or season of 13 weeks. Only the final quarter spans 14 weeks once per 5 to 6 years.

Cal7 also has months with 7 weeks, but alternates them with ones of 8 weeks (8:7), totalling in just 7 months.

Relation to other leap week calendars
Week 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53
Cal7 Monmonth Tuesmonth Wednesmonth Thursmonth Frimonth Saturmonth Sunmonth†
Octalendar month 1 month 2 month 3 month 4 month 5 month 6 month 7 month 8
Quarter quart 1 quart 2 quart 3 quart 4
5:4:4 January February March April May June July August September October November December†
4:5:4 January February March April May June July August September October November December†
4:4:5 January February March April May June July August September October November December†
13mon January February March April May June X July August September October November December†
 Academic (example) Spring semester Summer break Fall semester
Winter semester Spring break Summer semester Summer break Winter semester
Epiphany/Hilary trimester Trinity trimester summer break Michaelmas trimester

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