60-week Calendar

60-week Calendar.

This is another 12-month calendar proposal which I did mostly for fun.

I still think it has many advantages over our Gregorian Calendar, but it has the disadvantage that it uses a 6-day week, breaking with a really old tradition.
It also has a different leap year rule, which is a bit more accurate (and easier) than the Gregorian one.

Index:

Months and days.
The week.
The year.
The Epoch.
The leap rule.
Conversion (Gregorian to 60-week calendar)
Conversion (60-week to Gregorian calendar)

Months and days.

The year is divided in 12 months of exactly 30 days each. Their names are exactly the same that those in our present calendar, in the same order. There are 5 or 6 extra days, named:

    New Year day. (the first day of the year)
    Spring day. (between March 30th and April 1st)
    Summer day. (between June 30th and July 1st or Leap day)
    Leap day.   (only in leap years, before July 1st)
    Autumn day. (between September 30th and October 1st)
    Winter day. (after December 30th, the last day of the year)

Each month has exactly 5 weeks, and starts on Monday.

The year doesn't start at the same time that the Gregorian one.

The week.

The week has only 6 days, and they are (in this order):
Monday, Wednesday, Thursday, Friday, Saturday and Sunday.

There are exactly 5 weeks in each month:

M	W	T	F	S	S
1	2	3	4	5	6
7	8	9	10	11	12
13	14	15	16	17	18
19	20	21	22	23	24
25	26	27	28	29	30

Under this scheme, there are four work days for each 6, instead of 5 for each 7.
If the daily labor hours were increased from 8 to 9, this can be compensated.

(9 + 9 + 9 + 9 + 0 + 0) / 6 = 6 hours. (More than Gregorian).
(8 + 8 + 8 + 8 +8 + 0 + 0) / 7 = 5.71 hours.

So, in total, we have 60 weeks in a year, 15 in a quarter, 30 in a semester... ALWAYS !!!

The year.

As I'll explain later, the average duration of a year in this calendar (365.2421875 days) is a bit shorter than a Gregorian one (365.2425 days), so there is not an exact match between them.

Due to the different leap year rules, sometimes one calendar gets one day ahead of the other during a time, but later they match again, but after a really long period of time, the difference becomes permanent.

In average, this calendar will be 1 day behind the Gregorian each 3200 years.

At least, between the years 1937 and 2063, the year will start on December 20th (Gregorian).

The Epoch.

Another modification is the epoch. In order to avoid negative years when reckoning history:

New Year Day 1 = Friday, December 22nd of 6001 BC (Gregorian, not Julian)

This results in:

New Year Day 8001 = Wednesday, December 20th, 2000 CE.

So, for example January 1st, 2001 (Greg) turns into January 12th, 8001.

The leap rule.

"All years divisible by 4, but not by 128 are leap years".

Considering this, the last time when calendars didn't match was 1936, because 1936 (Gregorian) was a leap year, but 7936 (60wc) wasn't. It won't happen again until year 2064 (Gregorian).

Conversion.
(Gregorian to 60-week)

I'll add a software page with a converting program, but for years between 1937 and 2063, you can use the following chart.

If X is a non-leap year:

Gregorian	60-week Calendar
January 1^st, year X	January 12^th, year X+6000
February 1^st, year X	February 13^th, year X+6000
March 1^st, year X	March 11^th, year X+6000
March 21^st, year X	Spring day, year X+6000
April 1^st, year X	April 11^th, year X+6000
May 1^st, year X	May 11^th, year X+6000
June 1^st, year X	June 12^th, year X+6000
June 20^th, year X	Summer day, year X+6000
July 1^st, year X	July 11^th, year X+6000
August 1^st, year X	August 12^th, year X+6000
September 1^st, year X	September 13^th, year X+6000
September 19^th, year X	Autumn day, year X+6000
October 1^st, year X	October 12^th, year X+6000
November 1^st, year X	November 13^th, year X+6000
December 1^st, year X	December 13^th, year X+6000
December 19^th, year X	Winter day, year X+6000
December 20^th, year X	New year day, X+6001

If X is a leap year:

Gregorian	60-week Calendar
January 1^st, year X	January 12^th, year X+6000
February 1^st, year X	February 13^th, year X+6000
March 1^st, year X	March 12^th, year X+6000
March 20^th, year X	Spring day, year X+6000
April 1^st, year X	April 12^th, year X+6000
May 1^st, year X	May 12^th, year X+6000
June 1^st, year X	June 13^th, year X+6000
June 19^th, year X	Summer day, year X+6000
June 20^th, year X	LEAP day, year X+6000
July 1^st, year X	July 11^th, year X+6000
August 1^st, year X	August 12^th, year X+6000
September 1^st, year X	September 13^th, year X+6000
September 19^th, year X	Autumn day, year X+6000
October 1^st, year X	October 12^th, year X+6000
November 1^st, year X	November 13^th, year X+6000
December 1^st, year X	December 13^th, year X+6000
December 19^th, year X	Winter day, year X+6000
December 20^th, year X	New year day, X+6001

Conversion.
(60-week to Gregorian)

Remember that this charts are only 100% accurate for years between 7937 and 8063 (60wc).

If X is a non-leap year:

60-week Calendar	Gregorian
New year day, X	December 20^th, year X-6001
January 1^st, year X	December 21^st, year X-6001
February 1^st, year X	January 20^th, year X-6000
March 1^st, year X	February 19^th, year X-6000
Spring day, year X	March 21^st, year X-6000
April 1^st, year X	March 22^nd, year X-6000
May 1^st, year X	April 21^st, year X-6000
June 1^st, year X	May 21^st, year X-6000
Summer day, year X	June 20^th, year X-6000
July 1^st, year X	June 21^st, year X-6000
August 1^st, year X	July 21^st, year X-6000
September 1^st, year X	August 20^th, year X-6000
Autumn day, year X	September 19^th, year X-6000
October 1^st, year X	September 20^th, year X-6000
November 1^st, year X	October 20^th, year X-6000
December 1^st, year X	November 19^th, year X-6000
Winter day, year X	December 19^th, year X-6000

If X is a leap year:

60-week Calendar	Gregorian
New year day, X	December 20^th, year X-6001
January 1^st, year X	December 21^st, year X-6001
February 1^st, year X	January 20^th, year X-6000
March 1^st, year X	February 19^th, year X-6000
Spring day, year X	March 20^th, year X-6000
April 1^st, year X	March 21^st, year X-6000
May 1^st, year X	April 20^th, year X-6000
June 1^st, year X	May 20^th, year X-6000
Summer day, year X	June 19^th, year X-6000
LEAP day, year X	June 20^th, year X-6000
July 1^st, year X	June 21^st, year X-6000
August 1^st, year X	July 21^st, year X-6000
September 1^st, year X	August 20^th, year X-6000
Autumn day, year X	September 19^th, year X-6000
October 1^st, year X	September 20^th, year X-6000
November 1^st, year X	October 20^th, year X-6000
December 1^st, year X	November 19^th, year X-6000
Winter day, year X	December 19^th, year X-6000

Comments, opinions? Mail me.

Last updated on: January 12^th, 8001 (January 1^st, 2001 Gregorian)