I have a macOS daemon that uses NSTimers for scheduling user event reminders. 

This works well except for abrupt time changes:
  (1) the user explicitly changes the date/time
  (2) the user crosses into a different time zone
  (3) daylight saving time comes/goes. 
Then I need to recalculate the timers based on the new current time.

The Apple docs don't list any NSWorkspace notifications related to the above. 
How can I handle these cases?

-Carl

macOS Mojave 10.14.6, ObjC+Cocoa, Xcode 11.2.1
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