Leap Week Calendar - Disadvantages

Disadvantages

• A year with a leap week is at least 7 days longer than a year without a leap week. Consequently, the equinoxes and solstices must vary over 7 days, (i.e. ±3 of the average date), or even more, such as 19 days in the Pax Calendar.

• If the added week is intercalary then people born during a leap week have birthday problems, similar to those born on February 29th. Further, about 1 in 294 days would belong to a leap week, compared to about 1 in 1506 days that fall on February 29th.

• Leap-year rules are usually more complicated than the Gregorian rule—except for the ISO Week Date, which follows the Gregorian calendar, having no leap-year rule of its own.

• Quarterly accounting statistics will not be consistent over multiple years, since the year quarter containing the leap week will sometimes include 14 weeks instead of the usual 13.