I once worked in an industry that used the 24-hour clock (“military time”) almost exclusively. While I hated it at first, I’ve grown to love its lack of ambiguity. There is no “7AM” or “7PM” in my world, just “07:00” and “19:00”. I’ve set all my electronic devices to display 24-hour time, and even bought an alarm clock specifically because it can display 24-hour time.
Which is why Windows 10’s Welcome Screen drove me insane. In Windows, most regional settings are handled on a per-user basis. So if my GF and I shared a computer, I could use the 24-hour clock on my account, but she could use the 12-hour clock on her account. But the thing is, when you boot up a Windows 10 computer, no user is logged in. By default (in the United States, anyway) Windows 10 displays the 12-hour clock. It’s hardly the end of the world: I only reboot my computer once a month for updates… but it just nagged at the OCD part of my personality to see “2:34PM” on the Welcome Screen instead of “14:34”.
Can you change that? Of course you can!
Open Control Panel and go to “Region”.
If you haven’t already, use the drop-down boxes to choose the 24-hour clock option under “Short Time:” and “Long Time:” (red arrows) and click “Apply”. Then (or if your computer already uses the 24-hour clock) click on the “Administrative” tab (blue arrow):
Click the “Copy Settings” button:
Lastly, check the box under “Welcome Screen and system accounts”. I also read a couple of posts saying to check the “New User Accounts” box, too. Since I’m the only one who uses this computer… why not?
From here on out, the Welcome Screen should display the 24-hour clock. Hooray!