This addon simply removes the day/night indicator next to the minimap.
This addon simply removes the day/night indicator next to the minimap, which is displayed in the first screenshot.
This addon was originally developed by Sepioth, but hasn't been updated since WoW 1.5, so I took over the maintenance of this addon.
To use this addon, simply copy the folder to your interfaces-directory. Afterwards the time indicator should be gone as displayed in the second screenshot.
In the keybindings menu, you should recognize a new entry, which allows you to bind a key to toggle the indicator.