Windows 10 - New Clock and Calendar

If you're using the latest Windows 10 Technical Preview build (9901) there's a new and hidden clock and calendar.

To unlock it:

1. Open registry (regedit.exe)
2. Navigate to HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\ImmersiveShell
3. Create a new DWORD (32-bit) and name it UseWin32TrayClockExperience
4. Set the value to 0
5. Reboot

Will now see a redesigned clock and calendar.

Before

After