/usr/share/applications/gnome-datetime-panel.desktop is in gnome-control-center 1:3.6.3-0ubuntu56.
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 | [Desktop Entry]
Name=Date & Time
Comment=Date and Time preferences panel
Exec=gnome-control-center datetime
Icon=preferences-system-time
Terminal=false
Type=Application
StartupNotify=true
Categories=GNOME;GTK;Settings;X-GNOME-SystemSettings;X-GNOME-Settings-Panel;
OnlyShowIn=GNOME;
X-GNOME-Settings-Panel=datetime
# Translators: those are keywords for the date and time control-center panel
Keywords=Clock;Timezone;Location;
X-Ubuntu-Gettext-Domain=gnome-control-center-2.0
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