Turn key to Z/PGM mode
enter DDMMYY ST ST
enter HHMM (24hr format) ST ST
Turn key back to REG mode
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If anyone needs more information, the XE-A102 manual is here:
http://the-checkout-tech.com/manuals/cashregisters/Sharp_XE-A102_operating_and_programming_manual.html
Registerman, May 2011