-* update the kernel's TZ (sys_tz) when DST changes
-
-* sync down the system time to the RTC when:
- - CLOCK_REALTIME makes jumps (the user explicitely requested a time set)
- - DST/timezone changes && ntp is active && RTC-in-localtime (never do it without ntp)
- This takes care of syncing ntpdate updates to the RTC, and DST updates for localtime
- mode, it will never touch the RTC if the no reliable time source is active or the
- user did not request anything like it.
-