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Some research (in the wrong places) revealed that it had to do with the “use small taskbar buttons” setting. My problem was that the clock only showed the time but not the date:

Then I changed the taskbar location to be left, going from the top left corner of my screen to the bottom left corner. I installed Windows 10 and activated the “use small taskbar buttons” checkbox in the TaskBar properties. Well, this is kinda stupid, but it still took me too much time to figure it out.
