Double Leap Calendar
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    • 2001-2800 (Plan A)
    • 2001-2800 (Plan B)
  • 2801-5600
  • 1582-Oct
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    • 46 BC
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Update: Brij Bhushan Vij implemented his DIVIDE SEVEN (7) PLAN to the Double Leap Calendar - Download the .pdf file here (Note the Calendar Cycle is 896 years exactly)

The blue numbers in the calendar are the numbering of weeks.

JanAprJulOctNMTWRFS
11427401234567
2152841891011121314
316294215161718192021
417304322232425262728
51831442930
FebMayAugNov12345
61932456789101112
720334613141516171819
821344720212223242526
922354827282930
MarJunSepDec123
1023364945678910
1124375011121314151617
1225385118192021222324
1326395225262728293031
Dec
1st Leap Week5332333435363738
2nd Leap Week5439404142434445
December either gets 1 Leap Week or 2 Leap Weeks (see Adjustments on how leap weeks are applied).

Features:

  • 364 days
  • 52 weeks
  • 2,800-year period calendar (repeatable)
  • Each month contains 30/31 days except for December which might have 31/38/45 days

Fixed holidays and special days:

  • New Year's Day - Sun, Jan 1
  • Valentine's Day - Mon, Feb 14
  • Good Friday - Fri, Apr 6
  • Easter Monday - Mon, Apr 9
  • Helloween - Mon, Oct 30
  • Christmas Eve - Sat, Dec 24
  • Christmas Day - Sun, Dec 25
  • New Year's Eve - Sat, Dec 31/38/45

ISO 8601 format for the days in the leap week: e.g. 2100-12-32


North America Daylight Saving Time (DST):
Begins on Sun, Mar 4 @ 2 AM & Ends on Sun, Oct 29 @ 2 AM (34 weeks from Week 10 to Week 43)


'Won't it be much easier to remember when to adjust your clocks?? It will always be Mar 4 and Oct 29!!'


Pros:

  1. Lifelong calendar. Well...hopefully no major catastrophic events that would change the Earth's axis and causing it to tilt at a different angle, or a change in speed when rotating on its axis, or a change in speed when revolving around the Sun. Else, we will have to change the calendar again.
  2. Complies with the 7-day cycle in the bible, respects the fourth of the Ten Commandments, and Sabbath. Quote from the bible (Genesis 2:2): 'On the seventh day God finished his work which he had made; and he rested on the seventh day from all his work which he had made.'
  3. Equal financial quarters - ideal for businesses and governments. Consistent with university and high-school schedules.

Cons:

  1. Complication in leaping days/weeks/months/years: A solar year is roughly 365.25 (The mean tropical/solar year in 2000 AD is 365.2422 SI days (see Tropical/Solar Year)). In order to account for the 1.25 days loss each year, one method is to use the above. Alternatively, we can add a 35-day leap month every 28 years (1.25 days/year * 28 years = 35 days). This method is not recommended as it disrupts the 12-month cycle, dramatically.
  2. Friday the 13th appears every 3 months or 4 times per year (Oh come on, the world is not perfect!?). I mean, really, think about your worst days in your life, do they all fall on the Friday the 13th?? I think we'll get used to it, eventually.
  3. For those who were born during the leap weeks, you'll have to celebrate on December 31.

© 2009-2016 Marcus W.

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