/usr/share/ubuntu-mate/settings-overlay/config/plank/dock1/launchers/clock.dockitem is in ubuntu-mate-default-settings 16.04.5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 | #This file auto-generated by Plank.
#2016-03-13T22:37:47+0000
[PlankDockItemPreferences]
#The uri for this item.
Launcher=docklet://clock
[DockyClockPreferences]
#If the clock shows 24hr time (when showing digital and in the hover).
ShowMilitary=false
#If the clock shows a digital clock (true) or an analog clock (false).
ShowDigital=false
#If the clock shows the date in digital mode.
ShowDate=false
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