[tz] Time Zone Standards

Paul Eggert eggert at cs.ucla.edu
Thu Jan 31 02:35:42 UTC 2019

The guideline given here:



'If your government plans to change its time zone boundaries or daylight 
saving rules, inform tz at iana.org well in advance, as this will 
coordinate updates to many cell phones, computers, and other devices 
around the world. With less than a year's notice there is a good chance 
that some computer-based clocks will operate incorrectly after the 
change, due to delays in propagating updates to software and data. The 
shorter the notice, the more likely clock problems will arise....'

This is good advice. For more, please see "On the Timing of Time Zone 
Changes", here:


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