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A US physicist is lobbying for people to adopt his novel calendar in which every date falls on the same day of the week each year.

The current calendar, which runs for 365 days, was instituted by Pope Gregory in 1582 to bring the length of the year in line with the seasons. But because the Earth actually orbits the Sun every 365.24 days, a 366-day "leap year" must be added every four years to account for the extra fraction of a day. In this Gregorian system, a given date (such as New Year's Day) falls on different days of the week in different years because 365 is not evenly divisible by seven.

http://www.newscientist.com/article.ns?id=dn6835