This document reports the results of a survey conducted to determine (1) the types of academic calendars being used in colleges and universities in the U.S.: and (2) the changes taking place. Six types of calendars are defined: the traditional semester calendar; the trimester calendar; the 4-1-4 calendar; and other calendars. The survey was very timely, for the results show that a calendar revolution is taking place. Of the 2,475 respondents, 1,130 were changing their academic calendars from the traditional semester calendars, and the majority of these institutions were changing to either the early semester calendar or the 4-1-4 calendar. The data are listed in tables by institution and state. (HS)