Sony WALKMAN WM-GX90 Operating Instructions Manual page 25

Repeat step 2 to set the
minute.
SS a
® >| a
Press the CLOCK button
again to activate the
clock.
= >|
Choose either the 12-hour
display or 24-hour display
by pressing either the +
or — button.
i@H
You can change the display to 12-hour or 24-hour display even after
the clock has been set.