From: ahk@chinet.com   
      
   Stephen Sprunk  wrote:   
   >On 19-Jun-14 12:59, Adam H. Kerman wrote:   
   >>Peter Schleifer  wrote:   
   >>>"Adam H. Kerman"  wrote:   
   >>>>Stephen Sprunk  wrote:   
      
   >>>>>Indeed.  I keep my clocks, phone, etc. on 24-hour time because   
   >>>>>it's easier for me to do timezone math that way (I work with   
   >>>>>people all over the world), but it confuses the heck out of   
   >>>>>most other Merkins unless they've been in the military.   
      
   >>>>Wow. That statement makes no sense. Subtraction and addition work   
   >>>>the same way with 12 or 24 hour clocks. One may have to   
   >>>>compensate for two different calendar days, which 24 hour clocks   
   >>>>don't help with.   
      
   >>>It makes perfect sense to me.  Even when just dealing with one   
   >>>time zone, I'll think in terms of a 24-hour clock when calculating   
   >>>when a meeting will end.  I don't keep my clocks on 24-hour time   
   >>>though since I just convert back and forth in my head anyway.   
      
   >>Isn't that the way everybody does it, even people who wouldn't   
   >>regularly use a 24 hour clock? If the time interval in question   
   >>crosses 1 pm, at some point in calculating the interval, one has to   
   >>subtract 12 hours or subtract from 12 hours. Neither 12 hour nor 24   
   >>hour clock has the advantage when two different calendar days are   
   >>involved.   
      
   >>Whether a 12 or 24 hour clock is used, time-interval calculations   
   >>are simple arithmetic that we all learned to do in our heads when we   
   >>first learned to tell time as very young children and it's ridiculous   
   >>to make excuses for not being able to calculate a time interval.   
      
   >It's not a question of ability; I simply said it's _easier_ with a   
   >24-hour clock.   
      
   With a 24-hour clock, you might have to subtract 24, depending if the   
   time interval crosses midnight. That's easier than subtracting 12?   
      
   >>Converting time among time zones, one has to keep in mind which time   
   >>zone is to the east and which is to the west, AND where standard   
   >>versus daylight/summer time is observed, as there is no worldwide   
   >>time when the switch away from standard time is performed.   
      
   >... and many countries don't do DST anyway; even within the US, there   
   >are two (formerly, three) states that don't.  It's a silly idea anyway;   
   >maybe it made sense a hundred years ago, but now the theoretical energy   
   >savings are easily wiped out by all the energy we expend switching our   
   >clocks back and forth.   
      
   Oh, I don't think switching to Daylight time ever made sense.   
      
   I have no idea which states you're counting, for I count three:   
      
   Hawaii doesn't observe Daylight Time, but the part of Alaska in the same   
   time zone does observe Daylight Time, as does the bulk of Alaska in Alaska   
   Time Zone. Annette Island, Alaska, Pacific Time, remains on standard time   
   year round. It's the home of Metlakatla Indians.   
      
   Opposite situation with one Indian reservation in Arizona. While the   
   entire state is Mountain Time and remains on standard time throughout   
   the year, Navajo Indian reservation observes daylight time, whereas Hopi   
   Indian reservation (fully surrounded by the Navajo reservation) remains   
   on standard time throughout the year.  How confusing is that?   
      
   I knew about Indian nations not following their state's daylight/standard   
   time in Arizona and Alaska, but had to look up where it was applicable.   
      
   Here's some more of what I looked up:   
      
   The new Chamorro time zone for Guam and Northern Mariana Islands remains   
   on standard time throughout the year. Wikipedia sez the colonial-era law   
   (I guess under Spain) establishing Guam time zone remains on the books but   
   the US time zone act forgot to standardize time in Guam under federal law   
   until 2000.   
      
   Somoan time is still weirder: American Somoa and Midway Atoll don't   
   observe daylight time, but the nation of Somoa moved itself across the   
   International Date Line two years ago, so same time zone with a full   
   day offset.   
      
   Indiana didn't observe daylight time in most of the state in Eastern   
   Time until a few years ago; the Central Time portions of Indiana observed   
   daylight time. Certain counties in Eastern Time used to change their clocks   
   regardless. The governor didn't like the anomoly of being different from   
   the surrounding states, I guess, except this essentially puts the eastern   
   part of Indiana on double daylight time, which is why the state didn't   
   observe daylight time in these areas in the first place. Geographically,   
   Indiana should be in Central Time.   
      
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