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Re: Railway time (Standard Time) undone once again in the United States.
Author: JST3751
Date: 03-09-2015 - 13:29
mook Wrote:
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> DST is optional for states in the US. Arizona and
> Hawaii don't do it. So in winter Arizona is on
> MST, in summer it's on PDT. But if they do use DST
> everybody follows the same start and end dates.
The time in MOST of Arizona is ALWAYS MST. It never changes. There are no time zone boundary changes when DST starts and then ends. Arizona does NOT observe PDT since it is not in the Pacific Time zone.
The lands of the Navajo Indian Reservation within Arizona do observe DST and so from the first Sunday in March to the first Sunday in November observe MDT.
> Allegedly DST saves energy - but in my experience
> it costs energy in places that are hot (like the
> California Central Valley) because you come home
> and turn on the a/c for the hottest part of the
> day (mid-afternoon, sun time) rather than an hour
> later (sun time) when the sun has dropped a bit.
> Not that either DST or ST matter much in a place
> like Fresno where the hottest part of the day is
> usually from about an hour before sunset to 2
> hours after (frequently doesn't drop below 100F
> until after midnight) ...
When the start and end dates of DST were changed several years ago, some group (I do not remember who) did a study of electricity used in the 2 years before the change and the 2 years after the change The change in the dates showed no change in electricity usage overall.
Also a study in Indiana AFTER Indiana adopted full state DST resulted in an overall increase in electricity usage.
-------------------------------------------------------
> DST is optional for states in the US. Arizona and
> Hawaii don't do it. So in winter Arizona is on
> MST, in summer it's on PDT. But if they do use DST
> everybody follows the same start and end dates.
The time in MOST of Arizona is ALWAYS MST. It never changes. There are no time zone boundary changes when DST starts and then ends. Arizona does NOT observe PDT since it is not in the Pacific Time zone.
The lands of the Navajo Indian Reservation within Arizona do observe DST and so from the first Sunday in March to the first Sunday in November observe MDT.
> Allegedly DST saves energy - but in my experience
> it costs energy in places that are hot (like the
> California Central Valley) because you come home
> and turn on the a/c for the hottest part of the
> day (mid-afternoon, sun time) rather than an hour
> later (sun time) when the sun has dropped a bit.
> Not that either DST or ST matter much in a place
> like Fresno where the hottest part of the day is
> usually from about an hour before sunset to 2
> hours after (frequently doesn't drop below 100F
> until after midnight) ...
When the start and end dates of DST were changed several years ago, some group (I do not remember who) did a study of electricity used in the 2 years before the change and the 2 years after the change The change in the dates showed no change in electricity usage overall.
Also a study in Indiana AFTER Indiana adopted full state DST resulted in an overall increase in electricity usage.
