HP 50g Graphing Calculator - Manual (Page 39)

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Setting the date
After setting the time format option, the SET TIME AND DATE input form will
look as follows:
To set the date, first set the date format. The default format is M/D/Y (month/
day/year). To modify this format, press the down arrow key. This will highlight
the date format as shown below:
Use the @CHOOS soft menu key to see the options for the date format:
Highlight your choice by using the up and down arrow keys,— ˜, and
press the
!!@@OK#@ soft menu key to make the selection.