[tz] Anticipated strategy for handling US state DST rule changes

[Marc Sackeli]

I apologize if this is a repeat question, but this question pertains
specifically to how the tz database might change if individual US states
start adhering to their own DST rules.

There has been a wave of legislation
<https://en.wikipedia.org/wiki/Daylight_saving_time_in_the_United_States#2015%E2%80%932019_Proposals_for_the_introduction_of_Year-Round_DST>
coming
from individual states trying to shift towards a year-round DST model.
While several states have successfully passed this legislation, their
ability to shift is reliant on federal approval. Arizona has been able to
drum to their own beat on DST, and I don't think it's far fetched to think
other states might be allowed to do so in the future as well.

If this is a potential outcome, is there an idea of how the tz database
would adapt to this change? My guess is that new entries would be created
to allow us to delineate between these states. We are currently covered if
California decides to change thanks to America/Los_Angeles, but what if
Oregon or Tennessee decides they want to change? Does this mean
America/Portland and America/Nashville would be created? Or perhaps
America/Oregon and America/Tennessee?

Any thoughts would be appreciated.

-Marc
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