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is an option to Refresh and Dynamic that specifies at what time interval to do updates.
Force DateString to dynamically update every second:
Use UpdateInterval directly in Dynamic:
Force an update to be done as fast as possible:
Updates may happen more frequently than specified by UpdateInterval:
You can lock the refreshes to UpdateInterval by also specifying TrackedSymbols:
Refresh RefreshRate TrackedSymbols Clock Dynamic Delayed CachePersistence