From: ahk@chinet.com   
      
   Peter Schleifer  wrote:   
   >"Adam H. Kerman"  wrote:   
   >>Stephen Sprunk  wrote:   
   >>>On 17-Jun-14 13:08, mroberds@att.net wrote:   
      
   >>>>Personally I think using a 24-hour clock would be a better idea, but   
   >>>>I realize that's a much bigger change in the world than just printing   
   >>>>some new train schedules.   
      
   >>>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.   
      
   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.   
      
   We even have the weirdness of certain Mediterranean countries, like Israel,   
   switching to summer time, because northern Europeans find it confusing   
   that there's far less variation in the length of the day throughout the   
   year closer to the equator than farther away from it.   
      
   Also, it's been pointed out that while Europeans may use 24 hour clocks   
   to state time for more civilian purposes than we do in the United States,   
   by no means have the ceased to use 12 hour clocks for all purposes.   
      
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