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United States Patent 5,806,063
Date formatting and sorting for dates spanning the turn of the
Dates stored in symbolic form in a database are reformatted to
permit easy manipulation and sorting of date-related information.
Each date in M.sub.1 M.sub.2, D.sub.1 D.sub.2, and Y.sub.1 Y.sub.2
format is converted to C.sub.1 C.sub.2, Y.sub.1 Y.sub.2, M.sub.1
M.sub.2, and D.sub.1 D.sub.2 format. To accomplish the conversion,
a 10-decade window starting on Y.sub.A Y.sub.B is defined that
encompasses all dates in the database. The value of C.sub.1 C.sub.2
is determined by the relative values of Y.sub.1 Y.sub.2 and Y.sub.A
Y.sub.B. The reformatted date information is particularly useful
when the reformatting is in C.sub.1 C.sub.2 Y.sub.1 Y.sub.2 M.sub.1
M.sub.2 D.sub.1 D.sub.2 format, because sorting by date is
accomplished using a pure numerical-value sort.