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Calendars in this category generally keep the features of the Gregorian calendar, such as

  • a 400-year leap cycle,
  • the 4:100:400 leap rule,
  • 12 months named January, February, March, April, May, June, July, August, September, October, November and December with more or less irregular lengths,
  • 365+1 days per year,
  • 7-day week,
  • leap day at the end of the second month.

They may change some of these to achieve particular benefits, but overall they are designed for calendar evolution, not revolution, which could be implemented gradually.

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