I always tend to modify some parts of the desktop, but I won’t customize it that much given the reason that I work on many desktops (at work and at customers) and would like to stay familiar with each of them the most.
One of those habits is looking for the current date next to the current time. Gnome 3 doesn’t show that by default, and right clicking for options didn’t show an option either.
By calling ‘gnome-tweak-tool’ I finally jumped into the right place, allowing me to set the day, date and time (no seconds, I hate animation disturbing my concentration).