Download Windows 8 Metro Logon Clock Screensaver

You just need to download the RAR file, extract it using WinRAR or 7-zip and then copy MetroClockfolder and MetroClock.scr file to "%windir%\System32" (i.e. C:\Windows\System32) folder. After that run Metro.reg file which sets the MetroClock.scr screensaver as default for login screen.

Now as soon as the screensaver is activated at login screen, it shows Windows 8 look-like metro logon with clock showing current date and time:

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PS: You can change the background image, time format (12-hour or 24-hour) and button sets by modifying the Settings.xml file present in MetroClock folder.