The 24-hour clock is used by default. To use the 12-hour clock:
Select Settings:
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Use the arrow buttons to select Time and date:

Select OK:
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The Time and date settings open.

Select the Right arrow until the 2/4 display opens:

Select Minus. The 24 h setting value is changed to Off.
Select OK:
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The 12-hour clock is now set.
To turn the 24-hour clock back on, follow the steps described above, but in step 6 select the On option.