Click toolbar button with clock icon to change colors.This add-on installs a theme and updates it every minute so you get current time.
Your normal theme will not work if you use this add-on so you have to choose date and clock or a normal theme not both.
You have around 40 settings so you can change everything.
Notes:Move text left and right with buttons or add space in textbox.
Add symbols, smilies etc.
Do not enter symbol "url" or "code" just highlight symbol, copy to clipboard and paste to "Add text" textbox.
Symbols
https://www.w3schools.com/charsets/ref_utf_symbols.asp 
