when doing a " last -x reboot" I get :
reboot system boot 3.14.4.1-bone-ar Thu Jan 1 01:00 - 08:00 (16964+05:59
reboot system boot 3.14.4.1-bone-ar Thu Jan 1 01:00 - 08:00 (16963+05:59
reboot system boot 3.14.4.1-bone-ar Thu Jan 1 01:00 - 08:00 (16962+05:59
reboot system boot 3.14.4.1-bone-ar Thu Jan 1 01:00 - 08:00 (16961+05:59
reboot system boot 3.14.4.1-bone-ar Thu Jan 1 01:00 - 08:00 (16960+05:59
reboot system boot 3.14.4.1-bone-ar Thu Jan 1 01:00 - 08:00 (16959+05:59
reboot system boot 3.14.4.1-bone-ar Thu Jan 1 01:00 - 08:00 (16958+05:59
reboot system boot 3.14.4.1-bone-ar Thu Jan 1 01:00 - 08:00 (16957+05:59
reboot system boot 3.14.4.1-bone-ar Thu Jan 1 01:00 - 08:00 (16956+05:59
reboot system boot 3.14.4.1-bone-ar Thu Jan 1 01:00 - 08:00 (16955+05:59
reboot system boot 3.14.4.1-bone-ar Thu Jan 1 01:00 - 08:00 (16954+05:59
reboot system boot 3.14.4.1-bone-ar Thu Jan 1 01:00 - 08:00 (16954+05:59
the date of the system is correct:
ubuntu@ubuntu-armhf:/var/log$ date
Thu Jun 30 16:41:00 CEST 2016
the date filedate of /var/log/wtmp is also correct
-rw-rw-r-- 1 utmp 239232 Jun 30 15:42 wtmp
What could be the reason of getting not the correct output ?