hardware (hwclock) clock and system-time should be in sync, as a start. However, there could be some issue with the busybox logger utility a/o cron ignoring time zones.
hwclock --verbose
hwclock from util-linux 2.32
System Time: 1569324414.937745
Trying to open: /dev/rtc0
Trying to open: /dev/rtc
Trying to open: /dev/misc/rtc
No usable clock interface found.
hwclock: Cannot access the Hardware Clock via any known method.
Anyone find a solution to this? I just installed syslog-ng 3.25.1-2 on openwrt 19.07.1, and was noticing a similar issue. hostapd's log timestamps correspond to the output of 'date' which is in EST, while dnsmasq-dhcp's log timestamps correspond to UTC.