ian 0b056c8f8d Fix AM/PM mode handling. The bits to mask off in the hours register changes
between 12/24 hour mode.  Also fix conversion between 12 and 24 hour mode.
It's not as easy as adding/subtracting 12, because the clock doesn't roll
over 11->0, it rolls over 12->1; 0 isn't a valid hour in AM/PM mode.
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