Welcome.
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E46 Clock:
To adjust
With the ignition key in position 1 or
higher and the time displayed in the
instrument cluster.
To set ahead: turn the right button to
the right.
To set back: turn the right button to the
left.
The adjustment speed will increase the
longer you continue to hold the right
button.
To change the display mode: press the
right button briefly.
Every time you press the button, the
clock display alternates between the
12-hour and 24-hour mode.
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You can download the manual from bmwusa.com (owner's circle section).