User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:42.0) Gecko/20100101 Firefox/42.0 Build ID: 20150823004007 Steps to reproduce: 1. Open Calendar. Press 'Home' button to have the app running in the background. 2. Wait for 1 min 3. Open Calendar again. Actual results: The time shown in the Calendar app status bar is 1 min later than the Homescreen status bar time. The time is shown nornally again after the app is closed. The same problem is observed in Clock app. Expected results: The Calendar status bar time is the same as in Homescreen status bar.