Date data processor
AssigneeNippon Electric Co., Ltd.
InventorsYukio Maehashi, Hidetoshi Kosaka
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Abstract
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.
Claims7
A date data processing system comprising first memory means for storing a date to be processed, means for calculating a difference in days from a reference date to said date, means for producing an inversely-calculated date by inversely-calculating a date from said difference in days and said reference date, second memory means for storing said inversely-calculated date, means for comparing the contents of said first memory means with the contents of said second memory means, and wherein said first memory means retains said date to be processed at least until termination of comparison by said comparing means.
Dependencies are inferred from the claim text.