HP 48gII - Manual (Page 39)

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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 ( B), to see the options for the date format:
Highlight your choice by using the up and down arrow keys, — ˜, and
press the !!@@OK#@ F soft menu key to make the selection.
Introducing the calculator’s keyboard
The figure below shows a diagram of the calculator’s keyboard with the
numbering of its rows and columns.