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From: Jeff Liebermann <jeffl@cruzio.com>
Newsgroups: rec.bicycles.tech
Subject: Re: Food Prices topic drift to TIME
Date: Wed, 04 Jun 2025 09:01:06 -0700
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On Wed, 04 Jun 2025 04:39:47 -0400, Catrike Ryder
<Soloman@old.bikers.org> wrote:

>On Tue, 03 Jun 2025 19:41:10 -0700, Jeff Liebermann <jeffl@cruzio.com>
>wrote:
>
>>On Tue, 03 Jun 2025 03:26:28 -0400, Catrike Ryder
>><Soloman@old.bikers.org> wrote:
>>
>>>On Mon, 02 Jun 2025 23:59:13 -0700, Jeff Liebermann <jeffl@cruzio.com>
>>>wrote:
>>>
>>>>On Mon, 2 Jun 2025 23:04:27 -0400, Frank Krygowski
>>>><frkrygow@sbcglobal.net> wrote:
>>>>
>>>>>On 6/2/2025 12:02 PM, pH wrote:
>>>>>> <snip food price postings>
>>>>>>>
>>>>>>>
>>>>>>> I opted for digital watches when my job required that I think in 24
>>>>>>> hour time with minute to minute acccuracy, which is much harder and
>>>>>>> slower to do with an analong timepiece. I have several watches and all
>>>>>>> but my old Scuba Dive watch are on digital 24 hour time, because once
>>>>>>> you use 24 hour time, you see how ridiculous 12 hour timekeeping is in
>>>>>>> today's world. It is, however, hard to convince people who've used the
>>>>>>> 12 hour time all their lives.
>>>>>>>
>>>>>>> I understand why 12 hour time first came into being. It was, of
>>>>>>> course, long before digital clocks and watches. An analog 24 hour
>>>>>>> timepiece is harder and slower to read accurately than a 12 hour one.
>>>>>>>
>>>>>>> The later system operations control rooms I worked in had both analog
>>>>>>> and a digital 24 hour clocks, but nobody paid any attention to the
>>>>>>> analog clocks.
>>>>>>>
>>>>>>> --
>>>>>>> C'est bon
>>>>>>> Soloman
>>>>>> 
>>>>>> And I wonder whey we have these weird 12 hour sixty minute times.
>>>>>> Babylonians?
>>>>>> 
>>>>>> I would have thought that when the MKS system came along they would have
>>>>>> instituted
>>>>>> 10 hour days
>>>>>> 100 minutes per hour and
>>>>>> 100 seconds per minute
>>>>>> 
>>>>>> to go along with meters, kilograms and seconds....
>>>>>> 
>>>>>> But I think the societal re-tooling would be far too great a task....
>>>>>> 
>>>>>> (cue Jeff L's fabulous research skills...)
>>>>>It may be too easy for Jeff.
>>>>>
>>>>>https://en.wikipedia.org/wiki/Decimal_time
>>>>
>>>>Thanks.  I forgot to look.  
>>>>
>>>>Notice that Decimal Analog Clocks and watches are available:
>>>><https://www.google.com/search?q=%22decimal%22%20clock&num=10&udm=2>
>>>><https://svalbard24.com/DECIMAL-WATCHES-c137983753>
>>>
>>>I don't see any advantrage to using decimal time.
>>
>>
>>Advantages of using decimal time
>>
>>I asked ChatGPT 3.5(free).  It produced a rather longish answer:
>><https://chatgpt.com/share/683fb02e-7b2c-800c-9d5f-39e7daf40701>
>>
>>I've never been able to tell time anything.  Time does what it wants
>>to do without my help.
>
>That answer has errors.  Computers do not "favor" decimal arithmatic.

I beg to differ.  Most CPU's support IEEE 754-2008 Decimal
Floating-Point Arithmetic.
<https://www.intel.com/content/www/us/en/developer/articles/tool/intel-decimal-floating-point-math-library.html>
"Software implementation of the IEEE 754-2008 Decimal Floating-Point
Arithmetic specification, aimed at financial applications, especially
in cases where legal requirements make it necessary to use decimal,
and not binary floating-point arithmetic (as computation performed
with binary floating-point operations may introduce small, but
unacceptable errors)."

There was a short time, in the 1960's, when I was receiving interest
payments from my bank, with rounding errors.

"IEEE-754 Floating Point Converter"
<https://www.h-schmidt.net/FloatConverter/IEEE754.html>

Rounding errors, when going from binary to floating point, is a common
problem found in calculations that extend to a large number of decimal
digits, such as weather calculations.  See the part about weather
calculations:
<https://www.investopedia.com/terms/r/rounding-error.asp>





-- 
Jeff Liebermann                 jeffl@cruzio.com
PO Box 272      http://www.LearnByDestroying.com
Ben Lomond CA 95005-0272
Skype: JeffLiebermann      AE6KS    831-336-2558