/usr/share/applications/unity-datetime-panel.desktop is in unity-control-center 15.04.0+18.04.20180216-0ubuntu1.
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 | [Desktop Entry]
Version=1.0
Name=Time & Date
Comment=Change your clock and date settings
Icon=unity-datetime-panel
TryExec=unity-control-center
Exec=unity-control-center datetime
StartupNotify=true
Type=Application
Categories=GNOME;GTK;Utility;DesktopSettings;Settings;X-GNOME-SystemSettings;X-Unity-Settings-Panel;
X-Unity-Settings-Panel=datetime
OnlyShowIn=Unity7;
X-Ubuntu-Gettext-Domain=unity-control-center
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