HW ver A1, f/w ver 1.04 central time zone US
I tried all the same things with this router as i did with the DIR-655 several years ago - copy computer time, use NTP server, save, re-boot, use NTP server only, do not copy computer time, save, re-boot, copy computer time, do not use NTP server save, re-boot, use different NTP server, save, re-boot etc...
Router time will eventually show as good after several tries, then will ALWAYS drift off by 1 to 5 hours over the next few weeks.
Are time-keeping algorithms all that difficult? D-Link has had this problem for at least 4 years that i know of personally (in two different time zones, once with ComCast (cable), and now with AT&T (u-verse fiber))