se out-of-date rules.</p>
<p>
For these reasons any rule change should be promulgated at least a
year before it affects how clocks operate; otherwise, there is a good
chance that many clocks will be wrong due to delays in propagating updates,
and that residents will be confused or even actively resist the change.
The shorter the notice, the more likely clock problems will arise; see “<a
href="https://codeofmatt.com/2016/04/23/on-the-timing-of-time-zone-changes/">On
the Timing of Time Zone Changes</a>” f