ntpdate -b pool.ntp.org
everytime I rebooted my BeagleBone Black. So, I searched around and found the following command will automatically set the correct time/date after every boot.
/usr/lib/connman/test/set-global-timeservers pool.ntp.org
I'm also collecting these tips on this page: http://exadler.myshopify.com/pages/beaglebone-black-useful-tips.