perpetual calendar

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A chart or mechanical device that indicates the day of the week corresponding to any given date over a period of many years.

from the GNU version of the Collaborative International Dictionary of English.

• A calendar that can be used perpetually or over a wide range of years. That of Capt. Herschel covers, as given below, dates from 1750 to 1961 only, but is capable of indefinite extension.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a chart or mechanical device that indicates the days of the week corresponding to any given date over a long period of years