Resets the time of a clock that is in timer or stopwatch mode.
<clock>
None.
The following resets the time of a stopwatch:
<trial sometrial>
/ ontrialend= [clock.timespent.resettime();]
</trial>
The following resets the time of a timer:
<trial sometrial>
/ ontrialend= [clock.timeremaining.resettime();]
</trial>