Do you want to see clock in full with seconds and year? Do you not have it at Ubuntu 17.10 and 18.04? Do you have another GNU/Linux distro (GNOME 3.26+) with same problem? What you need to do is to install Datetime Format extension and a little setting. This extension is an awesome improvement by Dan-K to control GNOME top panel's clock as you wish. The instruction do set it is explained below.

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Do you need to wake up at 04:00 AM in every morning? Do you need a simple alarm program so you can cook and leave the kitchen until a sound ringing? Do you want a simple Pomodoro alarm? Do you want it to run at Ubuntu startup? Do those all with Alarm Clock in Ubuntu. I will show the installation guide then how to use it by examples.

Clock is a lightweight and beautiful HTML5 powered desktop clock application which is available for Windows and Linux including Ubuntu. At a glance, Clock interface is like Windows 8 Metro style as shown in the picture below.