+* timer units should get the ability to trigger:
+ a) when CLOCK_REALTIME makes jumps (TFD_TIMER_CANCEL_ON_SET)
+ b) when DST jumps takes place (glibc's zoneinfo "mess")
+ We want to be able to schedule an event when the system time changes by user
+ request, or DST change takes effect, to update the rtc-in-localtime and sys_tz
+ of the kernel when needed.