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Purpose

TIRYYX is used to process two-digit or yy-style date input and to set the century part using any fixed-window, sliding-window, or other algorithm of choice, when using CA Gen in the standard map generation mode.

Internally, CA Gen handles four digit year dates correctly assuming the user application uses the yyyy edit pattern throughout. If the user interface is designed to accept a two-digit date entry, and defaulting to the current century is not acceptable, use this exit to implement logic to get the required behavior for defaulting the century part of the date.