@a:
             0                                                   1
hh:mm:ss.ms  |___________________________________________________|
%H:00:00.500 *                                                   | 0
%H:00:00.600 *                                                   | 0
%H:00:00.700 *                                                   | 0
%H:00:00.800 *                                                   | 0
%H:00:00.900 *                                                   | 0
             v___________________________________________________v
             0                                                   1
