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In the Almost Decimal Calendar, the year is divided either into 5 quinters (alias quintals) or into 10 months, each of which contains a whole number of weeks in a pattern of 10:11 for the former and 5:5:6:5 for the latter. That means each quinter is split into two months and a year has 10 months. The leap week is appended to the last quinter and month.

The ISO-like date format is ±YYYY-Q-W-D or ±YYYY-MM-W-D and ±YYYY-Q-M-W-D The calendar is compatible with that standard as far as possible, e.g. weeks begin on Monday.

In a normal long quinter (2 and 4), the first month is 6 weeks long, but in leap years, the second month of the last, 5th quinter is longer. This way, month 5 ends after week 26 and aligns nicely at the half-year mark with most other leap-week calendars.

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
5:5:6:5 month 1 month 2 month 3 month 4 month 5 month 6 month 7 month 8 month 9 month 10
10:11 quinter 1 quinter 2 quinter 3 quinter 4 quinter 5
9:9:8 sester 1 sester 2 sester 3 sester 4 sester 5 sester 6
8:7 Monmonth Tuesmonth Wednesmonth Thursmonth Frimonth Saturmonth Sunmonth†
7:6 month 1 month 2 month 3 month 4 month 5 month 6 month 7 month 8
13 quarter 1 quarter 2 quarter 3 quarter 4
4:5* January February March April May June July August September October November December†
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†
13×4 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 Winter semester
Epiphany/Hilary trimester Trinity trimester Summer break Michaelmas trimester

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