Two methods.

One like mentioned uses an android stereo and the ibus adapter linked above. It will automatically set the clock each time you start the vehicle. Very handy.

Second method is to use an android phone with the above linked ibus adapter. Each time you run the app on the phone with it plugged into the ibus adapter it will set the clock on your X5.

That's the only two options within reason without the factory stereo.

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Just BMW's - All cars and trucks was two pages long
1994 318is
1997 528i
2000 323i
2001 X5 3.0 auto
2005 X5 3.0 auto
2011 535xi auto
2013 X5 xdrive35 Turbo
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Aftermarket E53 Radio Install