One of the more maddening aspects of the new Windows 8 Start screen is that lacks a clock that's visible at all times. Sure, you can always check the time by accessing the Charms bar, which brings up a time/date window in the lower-left corner of the screen. And if you're working in the Desktop UI, the time and date are still visible in the lower-right corner.
There's good news, though. The Windows Store has dozens of clock apps that run right on the Start screen. For instance, the free Jojuba Software Clock (pictured) is a handy, no-frills timepiece for the Start screen. Launch the app, and you'll see a gargantuan clock and calendar, as well as a stopwatch, timer and alarm.