The problems with the Z3801 (and Z3812 / KS23xxx) devices is they expect the 
leapsecond to occur at the end of March/June/Sept/Dec.  So if the leapsecond is 
announced more than 3 months in advance they calculate the wrong day of the 
leapsecond.  I suspect that they would mess up any leapsecond not at the end of 
March/June/Sept/Dec.  I don't know if the HP53xxx devices have the same 
firmware bug...

After a couple of days after 30 Sep the Z3801A and Z3812A did not show a leap 
second was pending, so I power-cycled the Z3801A and it started showing the 
leap pending again.  I left the Z3812A running and after 3 days it started 
showing the proper leap second pending.
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