As part of my job, I occasionally have to make screencasts, usually demonstrating features in our various apps. Sometimes I need to record the entire screen, as I'll be demonstrating things that require activating and selecting menu items. I have a demo account I use for these recordings that lacks all of my usual menu bar add-ons, so the look is quite clean.
And in versions of macOS prior to Big Sur, I also hid the menu bar clock (via System Preferences → Date & Time → Clock, uncheck "Show date and time in menu bar.") But in Big Sur, the menu bar clock is also the button you click to open Notification Center…so there's no way to remove the clock from the menu bar.
Most of the time, this isn't a problem. But when recording screencasts, it's a big issue. I often record segments across days, and at multiple times a day. I then splice those bits together, often times not in a linear fashion. With the default Big Sur settings (displaying the full date and time), this leads to a real annoying time travel experience as the clock jumps around like crazy.
The following two tips help greatly with this problem, though being able to hide the clock entirely would be a much better solution…