Talk:Metric time

message: This article seems to be more about Decimal time of day than about the metric system. 
There seems to seems to be some confusion here between metric and decimal, and between time interval and time of day.  The modern metric system (SI) defines units of time interval, while the time of day is defined by various time scales, some of which are based upon the metric base unit of time interval.  Time of day is like, "We will strike the enemy at 0800 hours."  Time interval is like, "The battle lasted 8 hours."  You measure time of day with a clock or watch, and time interval with a stop watch.  The stuff about French clocks and Swiss watches should probably be moved to the Decimal time article.
But then, if this article was really about the metric system's definitions of time, then perhaps it should just redirect to the existing article on the Second.  The only reason I can think to keep it would be if there were other metric time units in use or seriously proposed.  Although "millidays" sound intriguing, does anyone actually use them?  I see that there are a lot of web sites about individual proposals for "metric time," but most of them are really about decimal time of day, and many seem to have little to do with the metric system. -- Nike 07:00, 19 Dec 2004 (UTC)
replies: text: It must be remembered that not all decimal is metric and not all metric is SI.  Firstly, SI is one of many possible metric systems (Stephen Dresner lists 17 different metric systems in his Encyclopedia of Units).  Metric as it is usually suggested does not have a time system.  The suggestion that the metric time system should be a decimal devision of the quarter-day comes from the use of right-assecension in astronomy, this would exactly match metric angle only when the time is a decimal division of the quadrant-day.  Other decimal divisions do not align with the metrics save for being decimal.  --Wendy.krieger (talk) 11:45, 9 January 2011 (UTC)
thread_title:  metric v. decimal 

message: I made some changes to this section. I reverted the line about "notable acceptance", because lack of familiarity isn't the only reason people haven't all changed base units for time. Much of the rest of the last paragraph was repetitive or just very poorly written, and I removed the last line:
:A quarter that was current in China for a couple of millennia before the Jesuits had the ke redefined.
:because it doesn't make any sense at all.  FireWorks 06:09, 12 May 2006 (UTC)
replies: text: Lapidary, admitted, but I envisaged the interested and clever reader to follow the ke-link for clarification (and the blue linked quarter stands for - of an hour, i.e. 15 minutes). As for acceptance, it is a well tested fact in office and home environments with decimal clocks that it was lack of feeling for how long  new franctions of minutes and hours were that made people most uneasy with the new units. / Kurtan 23:08, 13 May 2006 (UTC)
thread_title: Alternative Units

message: In computing, at least internally, metric time gained widespread use for ease of computation. Unix time gives date and time as number of seconds since January 1 1970, Microsoft's FILETIME as multiples of 100ns since January 1 1601 FILETIME documentation on MSDN.
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This was just reverted. Perhaps other editors may want to voice their opinion. --Pjacobi 12:27, 21 June 2006 (UTC)
replies: text: I don't think that Unix time is usually considered any more "metric time" than UTC is, since they both use whole SI seconds to track civil time, rather than measuring time interval using metric prefixes.  Unix time is decimal expression of time, which some people call metric time, but strictly speaking, it's not.
However, metric time submultiples are used on computers, e.g. milliseconds, microseconds and nanoseconds.  Unix time is usually stored in binary as an integral number of seconds; milliseconds, etc., are stored as a separate number.  Network Time Protocol is another application using nanoseconds.  I would like the article to elaborate more on the use of metric submultiples (and multiples) on computers.  --Nike 11:05, 22 June 2006 (UTC)
thread_title:  In computing 

message: I doubt this is worthy for inclusion in Wikipedia, but it might be. Anyway, I just found this page . Its about an alternative system of times and dates. Best of all though, it is actually going to be used - on asdfjkl;.com I just wondered what other Wikipedians thought of the idea?--Bjwebb (talk) 10:09, 24 June 2006 (UTC)
replies: text: This seems to have nothing to do with the subject of metric time, and Wikipedia does not allow original research.  Try a calendar reform forum, such as CALNDR-L. --Nike 19:52, 24 June 2006 (UTC)
thread_title:  The O'Harian Calendar 

message: Might be worth to make such section. E.g. I know that Vernor Vinge used kiloseconds and megaseconds in his novels.
80.201.199.103 17:40, 15 September 2006 (UTC)
replies: text: And that one episode of The Simpsons.  Principal Skinner moves Springfield to a version of Metric Time.  It's that first one with Stephen Hawking.--The Sporadic Update 00:23, 21 September 2006 (UTC)

text: If memory serves, metric time is also used in Joan D Vinge's Heaven's Chronicles series, whose characters live in habitiats an asteroid belt without a natural day. Edwin Greenwood (talk) 13:34, 14 August 2009 (UTC)
thread_title:  Metric time in fiction? 

message: The article states:
:When the metric system was introduced in France in 1795, it included units for length, area, dry volume, liquid capacity, weight or mass, and even currency, but not for time.
Someone changed this, with the note "exact date: 24 November 1793 (4 Frimaire of the Year II)".  This is incorrect.  That was the date that the full Republican Calendar was introduced, along with decimal time.  The Republican decimal metric system of weights and measures was introduced by the act passed on 18 Germinal an III (April 7, 1795).  There were earlier acts passed relating to the metre in 1793, but it was the 1795 act which finally established the entire system, including the metre, litre, gramme, are, stere and franc, along with the metric prefixes.  Decimal time was also indefinitely suspended in the same act.  See A History of the Meter for more information. --Nike 22:43, 3 January 2007 (UTC)
thread_title:  Date metric system was introduced 

message: If ever we decide to metricize the day, maybe we should go with a 40-hour day (instead of the 10-hour day most would propose); we'd have a 10-hour morning, a 10-hour afternoon, a 10-hour evening, and a 10-hour overnight period.
There's a system of angular measurement called, variously, the grad, grade, gradian, gon...  There are 400 grad per circle -- that's 100 per right angle...
  <http://en.wikipedia.org/wiki/Grad_(angle)>
This works reasonably well with the Earth, since it's very close to being 40 000 km in circumference.
So, a 40-hour day would line up reasonably well with the Earth's movements...  One hour (1/40th of a rotation) would cover 1 000 km of distance (at the equator).
But as with most metricized days, the second would have to be redefined.  Currently, there are 86 400 s/d (24 x 60 x 60).
With a 40-hour day, each hour having 100 minutes, each minute having 100 seconds, there'd be 400 000 s/d (40 x 100 x 100).
An alternative would be to have hours and millihours instead of minutes and seconds: so, 40 x 1000 = 40 000 mh/d.  That'd make the mh a little more than twice what the second is now.  To ease transition, the second could be defined as half a millihour, making 80 000 s/d.  The new second would then be 1,08% of what it is now.
Of course, there'd be some repercussions; e.g., the speed of light would become 323 775 854,64 m/s, due to the slight increase in the duration of the second.
rAS--192.75.95.127 (talk) 05:45, 10 January 2008 (UTC)
replies: text: This appears to be original research, and certainly does not relate to the existing metric system.  Actually, it's not so original, since it has been proposed numerous times already. --Nike (talk) 00:15, 13 January 2008 (UTC)

text: The idea of the quarter-day has been around for a long time, since this aligns with the angle.  See, eg demur and hesit at http://grandadmiralpetry.tripod.com/?metric.html.  Bill Colins http://www.billcollins.com.au/bc/mt/index.htm divides the day to 20 hours \ 100 minutes \ 20 seconds, or ultimately 40,000 seconds.  Both of these link the time to the metric angle system.--Wendy.krieger (talk) 10:35, 23 April 2010 (UTC)
thread_title:  40-hour Day 

message: The office features two unfamiliar clocks: a 24-hour clock and a and a ten-hour clock, ten hours being the length of the workers' shifts.  —Preceding unsigned comment added by 189.95.42.136 (talk) 06:31, 14 February 2009 (UTC)
thread_title:  Metropolis 

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message: Might be more appropriate to make them a single article: Decimal time. Interlaker (talk) 14:51, 19 March 2013 (UTC)
replies: text: Wouldn't it make more sense to merge it with second? Since this article is primarily about the metric unit for time, the second. --Nike (talk) 04:12, 21 March 2013 (UTC)

text: The only content of the Metric time article which seems unique is the history of alternative time units proposed for the metric system, e.g. centijour/centiday, centicé, centihour, etc. The "Problems" section is uncited, and appears to be original research, IMHO. The "Popular culture" section does not seem to be very notable. "Alternative meaning" is the only part which really discusses decimal time, and it's actually disambiguation. --Nike (talk) 06:10, 22 March 2013 (UTC)
thread_title:  Merge with Decimal Time article? 

message: I tend to agree/prefer the proposed decimal time by the SI president/founder that divides 1 day in tenth recursively. I intentionally uses singular unit naming to simplify things up from unnecessary pluralism.
1 day = 10 decimal hour = 10 deciday = 10 dd
1 deciday (1dd) = 10 decimal minute = 10 centiday = 10 cd
1 centiday (1cd) = 10 decimal second = 10 milliday = 10 md
So, a day will have 1000 milliday (1000 md) with 1 milliday (1 decimal second) = 6 standard second.
Yes, you're right - the UDT second/milliday hand will tick/move with longer delay than current 24h60m60s/standard second hand. If you ever want to see a faster hand moves, just add the microday hand - it'll move much faster than standard 24h60m60s second hand though. In this digital age, I prefer digital clocks that can save repair cost & time of analog clock's hand moving in faster tick rate over than 1 standard second tick (axiom #1: moving parts need constant maintenance time and costs) - and digital format means easily soft-programmable (and extendable via standard digital ports like USB ports or wireless BT/WiFi port) thus have more custom clock features displayed on just a screen/display than its analog counterpart, such as current room temperature monitoring feature displayed on digital clock's LCD display (exclusively or sharing space), stopwatch/timer on demand (temporarily use clock's LCD display to display the feature), etc.
Thus, the day 1 decimal second (1 md) before the next year (2014, and 1 year = 365 days) can be represented in a full date-time format simply as:
  [2013.364.999]  (YYYY.DDD.dcm)
We can even add more precision in SI magnitude scale such as 1/1000 of a milliday or 1 microday (ud), which is comparable to standard millisecond (1/1000 of a standard second), to represent 1 microday (1 ud) before the next 1st day od 2014:
  [2013.364.999.999]  (YYYY.DDD.dcm.u)
["dcm" is for fractional part of a day: deci/centi/milli-day, works as temporal symbol replacement to standard time symbols: "hms" or hour/minute/second. "YYYY" is the year count and always in a full 4-digit format. "DDD" is day count of the current "YYYY" year.]
'Month'/'Week'-like divisions, a common format standard for religious/seasonal-time based format just like the currently-used Gregorian calendar, can also be applied as necessary for those needing them such as religious groups, conservative (farmer/people) groups, etc - but these options may need separated different coding formats to avoid confusions to the standard UDT coding format.
For example, the "UDT.Religion" coding format may have any of these special "UDT.Alt" format templates:
   [YYYY-MoY-DoM/dcm.u]  (2013-Dec-31/999.999)
   [YYYY-MoY-DoM DoW/dcm.u]  (2013-Dec-31 Tue/999.999)
("MoY" can be month's count number or a full/shortened name month of the "YYYY" year. "DoM" is day count of the "MMM" month. "DoW" is Day of the Week [Monday-Sunday], in shortened/full name) 
Assumed the new remod UDT time format will replace/coexist on the standard one, the suffix "d" for "decimal-day" coding system in "dcm.u" digits template is intentionally not used, just like the standard day-time of "hh:mm:ss.ms" coding system digits template.
 As comparison: 
[9d:9c:9m] or [T999] is 1 decimal second (1 milliday or 1/1000 decimal day) before the next day. [1-digit/unit max]
[23h:59m:59s] or [H235959] is 1 standard second (1/86400 standard day) before the next day.  [2-digit/unit max]
I hope this UDT proposal with common simple public use examples will help accelerate decimal date-time adoption rate either from today or in the future (as also wished by SI president/founder years ago), since I knew many people have common basic problems when counting/converting/representing 24h/60m/60s sexagesimal time in current standard to ubiquitous decimal-based systems used today.
==> [Ois1974 @ 2013-12-21 Sat]
114.79.49.125 (talk) 11:18, 21 December 2013 (UTC)
replies: text: For what it's worth: Since this user insisted on restoring a similarly strange proposal at Talk:International System of Units after it was removed, I've now attempted to communicate with this user at User talk:114.79.49.227. --Closeapple (talk) 20:11, 3 January 2014 (UTC)
thread_title:  Proposed New Remod of Decimal Date & Time ("Universal Date-Time" or "UDT" format) 

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thread_title:  External links modified (January 2018) 

message: I mean, is "metric time" really even a thing, distinct from SI time or decimal time? I question if the subject is notable. Couldn't the information here be moved to the articles for the second and decimal time, or other articles? IIRC, in the days before Wikipedia there were a bunch of TimeCube-type sites with original research for different versions of "metric time", and this article was originally based upon some of that, but aside from Original research, the subject seems to me to be redundant. --Nike (talk) 08:29, 18 April 2019 (UTC)
replies: text: This article distinguishes metric time from decimal time by saying that the former is for measurement of time intervals, while the latter is for time of day. The metrication of timekeeping is a notable topic, and isn't really a good fit at second. I'm not opposed to merging the topic into some other article, but I don't offhand know where the best place for it would be. This is essentially a historical topic: the modern metric system uses the second as its base unit but there is a long history of other ideas and proposals about how to metrify timekeeping that needs to be covered somewhere.--Srleffler (talk) 16:45, 19 April 2019 (UTC)
thread_title:  Should this article be deleted? 

message: > Microsoft's NTFS FILETIME as multiples of 100 ns since January 1, 1601. VAX/VMS uses the number of 100 ns since November 17, 1858
The current article fails to explain what event happened on 1601.01.01 AD to make it a worthy choice of origo for Microsoft (eg. the debut of Hamlet, prince of Denmark or something like that)? The DEC VAX start date of 1858.11.17 is even more mysterious for the audience, maybe it's related to Darwin? 158.88.16.3 (talk) 14:30, 1 June 2023 (UTC)
replies: text: Not relevant to this article. Constant314 (talk) 15:41, 1 June 2023 (UTC)

text: These dates are just numerical coincidences which have nothing to do with the metric system. 1601 was the beginning of the first complete 400-year leap cycle in the Gregorian calendar. 1858 is what you get when you subtract 2400000 days from the Julian Day number.  Nike (talk) 06:14, 2 June 2023 (UTC)
thread_title:  What happened on these dates?