Some users experienced the time and date missing, Start menu button missing along with some other bugs and they were able to fix this by following the set of steps displayed below:

This solution is particularly useful for folks who are struggling with several different problems apart from the clock missing from the taskbar. Alternatively, you can right-click on the theme of your choice and click the Open option to install and apply it.After you download several themes, double-click on a theme to install and apply the theme on your PC.The Personalization gallery features over 300 themes. Visit the official Windows personalization gallery page and download any themes which appear pretty to you.One of them is definitely Microsoft’s own personalization gallery. There are many sites on the web where you can download plenty of Windows 10 themes.The new theme should be applied in no time. Here, click on the installed theme that you want to use to apply the theme.Click the Theme settings option on the right side of the window to open the classic Personalization window.In the Run box, type in Control Desktop, and press Enter to open the Personalization section of Settings.

Another way is to open the Run command box by simultaneously pressing Windows Key + R or by typing Run in the search bar.

Right-click on your desktop screen and click Personalize option in order to open and navigate to the Personalization section of the Settings app.

It’s possible that the theme they used disabled the clock in order to change its appearance or that changing the theme simply reset this functionality completely. Users who struggled with the same issue reported that they were able to fix the problem simply by changing the theme on their computers. Follow the instructions given in the methods displayed below in order to return the clock to its original position and location quickly.

Windows 7 clock disappeared