PROZESSOR FUER EIN DATUM DARSTELLENDE DATEN

摘要

A date data processor verifies whether an inputted date data exists or not. Inputted date data is stored in an input register which is composed of three sections according to month, day and year. A first calculating unit calculates the days difference between the inputted date data and a reference date, and the results are temporarily stored. A second calculating unit then performs an inverse calculating to arrive at a date based on the previously calculated days difference. The resulting date is compared with the inputted date to complete the verification.