It defaults to using the hardware date and time when an internet connection isn't present. From what I'm guessing, probably the system clock on your system is inaccurate?
You can check that from your system BIOS. ** Changed in: indicator-datetime (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/905484 Title: Clock is only synced when connected to internet To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/indicator-datetime/+bug/905484/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs