I'm unsure of what "new" clock functionality you are referring to.
Clocks have been in JMRI for years.
Click on tools followed by Clocks and then Setup Fast Clock.
from that screen you can get online help by click on help followed by window help to get assistance on using the fast clocks screen.
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Peter Ulvestad
JMRI Users Group Moderator - ( )
Tam Valley Group Moderator - ( )
Sprog-DCC Group Moderator - ( )
Edmonton Model Railroad Association -
Peter Ulvestad