What previous calendar years duplicate the days of the week and months for the year 2000?
In the following years all the days of the week and months were the same as they were in the year 2000. Note that all of these years are leap years.
1972, 1944, 1916, 1876, 1848, and 1820.
Infoplease.com has a lot more information about the calendars of the world in our Calendars and Holidays channel.
—The Fact Monster