World Calendar - Features

Features

The World Calendar is a 12-month, perennial calendar with equal quarters. It is perennial, or perpetual, because it remains the same every year.

Each quarter begins on Sunday, ends on Saturday. The quarters are equal: each has exactly 91 days, 13 weeks or 3 months. The three months have 31, 30, 30 days respectively. Each quarter begins with the 31-day months of January, April, July, or October.

The World Calendar also has the following two additional days to maintain the same new year days as the Gregorian calendar.

Worldsday
The last day of the year following Saturday 30 December. This additional day is dated "W", which equals 31 December, and named Worldsday, a year-end world holiday. It is followed by Sunday, 1 January in the new year.
Leapyear Day
This day is similarly added at the end of the second quarter in leap years. It is also dated "W", which equals 31 June, and named Leapyear Day. It is followed by Sunday, 1 July within the same year.

The World Calendar treats Worldsday and Leapyear Day as a 24-hour waiting period before resuming the calendar again. These off-calendar days, also known as "intercalary days", are not assigned weekday designations. They are intended to be treated as holidays.

Because any three-month sequence repeats with the same arrangement of days, The World Calendar can be expressed concisely:

Jan, Apr, Jul, Oct Feb, May, Aug, Nov Mar, Jun, Sep, Dec
S 1 8 15 22 29 5 12 19 26 3 10 17 24
M 2 9 16 23 30 6 13 20 27 4 11 18 25
T 3 10 17 24 31 7 14 21 28 5 12 19 26
W 4 11 18 25 1 8 15 22 29 6 13 20 27
T 5 12 19 26 2 9 16 23 30 7 14 21 28
F 6 13 20 27 3 10 17 24 1 8 15 22 29
S 7 14 21 28 4 11 18 25 2 9 16 23 30
30th December, Worldsday follows
30th June, Leapyear day follows (only on leap years)

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