An Executive Order must be formally titled "Executive Order" followed by a number, signed by the President, and published in the Federal Register. Presidential Memoranda, Proclamations, Determinations, and other executive actions that are not formally numbered Executive Orders do not count. The signing date as recorded in the Federal Register determines which period an Executive Order belongs to, using ET timezone. Classified Executive Orders count if acknowledged by number. Executive Orders that are later revoked still count for the period they were signed. The Federal Register is the primary source; alternative sources are used only if the Federal Register explicitly states data is incomplete.