Time Vortex Time Vortex

Terran Universal Time (TUT)29 min read

Calendar-Reform Politics

Author’s Note – I wrote most of this in 2019 but I have struggled to finish it due to depression over the intervening years. This is rough and needs more work and editing, but I have decided to release what I have done for this concept for posterity.

Introduction

Due to the increasing complexities inherent to our globalized and spacefaring world I am going to make the case that we should adopt a secondary time standard that I will call Terran Universal Time (TUT), which is a form of a metric timekeeping standard that will complement our need to switch over to the 24 hour clock (at least here in the US), and will make traveling, scheduling, live streaming, and publishing across time zones significantly easier. For once, we can keep ourselves ahead of the curve by adopting this as a secondary means of timekeeping to make life for a globalized Humanity easier, and to prepare Humanity for our inevitable future as an interstellar species IF we survive that long.

I. The Problems with Conventional Localized Time

A. Overview of the Primary Causes of Our Global Time Issues

1. Time Zones

Time Zones, we all know them and we all hate them, but they are a necessary evil in a globalized world.

In a limited capacity at work, I do have to schedule some business calls that are just within the US. Hell, just working with one time zone over is either way is confusing when we are trying to negotiate a workable meeting time (is it +1 or -1 hour, are they ahead or are we behind – what does that even mean?). Each suggestion requires way too much thought (cognitive load) and errors are occasionally made which causes frustration, inefficiencies, time, and money.

This is made even more difficult and apparent when I try to call to my overseas friends through the many time zones between us, and then we also have to deal with… (next section)

2. Daylight Saving Time

Just what exactly is Daylight-Saving Time and why do we have it? (see my future post for more info)

Fortunately, at least here in the US, Daylight Saving Time (DST) is standardized, and most of the US uses it, so this is less of a deal domestically. However, when I call to my friends over seas that becomes a much, much different story. Each country that has DST has different standards for when they begin or end, if they even use it at all. If you are not careful and were not aware of a time change that happens and then you miss your call or appointment by an hour.

B. Areas Where Localized Time Zones Causes Problems

1. Cross Time Zone Media

Media or events which have national or international reach such as:

  • Paper Media
    • magazines
    • newspapers
  • Standard Entertainment Media
    • television
    • radio
    • computer and console game releases
  • Internet Media and Online Communities
    • websites and blogs
    • video streaming and publishing sites such as Netflix, Hulu, Amazon Prime, etc
    • live streaming platforms like Twitch.tv, Facebook live, YouTube Gaming
    • social media sites such as Facebook and Twitter, and other media communities such has through Discord and MS Teams

…with time stamps that have audiences which are distributed across national or global time zones and through DST changes have to be printed for the local time zone, or are made for whatever the local printer is, or they may have to publish multiple times such 8/7 Central. All of which causes confusion.

I also had a Twitch stream with people from across the US and quite a few people from Europe. Hell, each time Netflix releases a new series people all around the world have to do a time conversion to figure it out, which is a lot of wasted time and brain cycles that does not need to happen.

2. Cross Time Zone Travel

  • bus schedules
  • flight schedules
  • ship schedules
  • train schedules

3. Global Organizations with Locations Across Time Zones

  • military or government
  • embassies, emergency services
  • international companies
  • call centers

4. Dates and Times for Global or Celestial Events

  • celestial events like dusk and dawn, moon phases, equinox and solstices
  • nationally or globally significant holidays or events

5. Interstellar Timekeeping

  • There is no day or night in the depths of space, so we will need a method of time keeping that is not so strongly related to our ideas of a localized solar day, because for most of the people in space that will not be a thing.

C. Cognitive Load and Costly Errors

1. Wasted Time and Thought

When attempting to negotiate a time while having to deal with time zones and Daylight Saving Time there is considerable confusion, frustration, cognitive load, and mistakes are made that are sooo very unnecessary and frustrating.

2. Time Math is Hard

As a computer programmer myself, this is an amazing video: The Problem with Time Zones (Computerphile, Dec 2013)!

3. Computational Errors

  • all of the issues with time zones and Daylight-Savings Time calculations

D. Examples of Problems

1. International Calls

For this conversation we are going to use 3 sets of time zones because they are directly relevant to me because:

  • I am from the US (Central Standard Time).
  • I have a friend in Germany.
  • My wife is from Belarus.

…and, more importantly, these time zones also happen to conveniently have what I need to show you the issues with our current time keeping system.

Country Std Time Zone DST Time Zone Date DST
Belarus +3 GMT
Germany +2 GMT +3 GMT Mar 31 – Oct 27 (2019)
United States -6 GMT -5 GMT Mar 10 – Nov 3 (2019)

2. The Metric Time Rag – A Cross Time Zone Publication

Consider a fictional magazine titled ‘The Metric Time Rag (TMTR)” based out of the US which also publishes in Germany and Belarus due to recent deals made.

TMTR would like to do a few things:

  1. arrange an video chat with all 3 regions
  2. arrange itineraries for travel for people from all 3 regions to a convention in Indonesia called SandsCon
  3. determine global publication times and dates for their regional magazines
  4. call the Australia’s consulate to arrange for travel visas to expand TMTR’s coverage area
  5. make a call to their software vendor’s call center located in India.

Here is the associated time information:

Country Std Time Zone DST Time Zone Date DST
Australia +11 GMT +12 GMT Oct 6 – April 7 (2019)
Belarus +3 GMT
Germany +2 GMT +3 GMT Mar 31 – Oct 27 (2019)
Indonesia +7 GMT
United States -6 GMT -5 GMT Mar 10 – Nov 3 (2019)

We are not gonna work through all of that, but I want you to start thinking about the complexities inherent to attempting figure out any one of those issues.

II. The Solution – A Secondary Metric Time Standard

A. Brief History of Metric Time

1. Overview Metric Time Throughout History

In looking to the future and looking to the past we will find a decimal based or metric based time system have been utilized and suggested at various times through history.

This section will be covered the following major sections:

  1. China (prior to 1628)
  2. Napoleon and France (1793 – 1795)
  3. A Spate of Scientific Interest in the Late 1800’s
  4. Swatch Time (1998)

2. China (prior to 1628)

Prior to 1628 in China, the Chinese used a form of metric time for a few thousand years.

See article Traditional Chinese Timekeeping (Wikipedia)

3. Napoleon and France (1793 – 1795)

During Napoleon’s metrification blitz following the French Revolution a metric time standard was used for about 17 months starting on November 24, 1793 before becoming non-mandatory on April 7, 1795. During those 500 days they created metric clocks and watches.

Learn More:

4. A Spate of Scientific Interest in the Late 1800’s

The idea resurfaced in the late nineteenth century, put forward by scientists at major conferences such as:

All had considered it, but none had put it into effect.

5. Swatch Time (1998)

In 1998 Swatch created Internet Time as a short lived marketing ploy. Internet Time was a decimal time system referenced on Biel Mean Time (BMT) instead of Greenwich Mean Time (GMT) which was a major criticism for it, and which makes this amazing attempt at metric time basically worthless. Believe it or not, BMT is but one hour (+01:00) off from GMT. Had hubris not been a large part of Swatch’s design process and, instead, had decided to use GMT and then marketed it with such uses as I list in this document, then it may have taken off as something imminently useful, especially as computers and the internet hit the scene, verses being widely ridiculed only to have the idea to die in obscurity.

Learn more about Swatch’s Internet Time:

B. How Does Metric Time Work?

1. A Sea of Numbers: The Math?

If you want to see how the math works out in a prettier and much more detailed fashion then here is a Google spreadsheet with the math broken down into easier to digest parts. I don’t want to overload you with a sea of numbers when the actual math is not pertinent to know at this point unless you are really into numbers, plus a webpage is not necessarily the best medium for presenting such table heavy data! =)

2. Basic Metric Time Notation

OK, don’t get your mind swimming when looking at this. As you are more exposed to its presentation it will start to make more sense. The later examples should help to clarify this a bit, but here is how metric time will look:

Metric time will run from 000, much like 24 hour time (00:00), and shall run until 999. Below is a table showing a conversion of various metric times to the 12 and 24 hour clocks so you can get a feel for it.

Time Conversion – Metric to 12/24 Hour Clock
Metric Time 24 Hour Clock 12 Hour Clock
999 23:59 11:59 PM
875 21:00 9:00 PM
750 18:00 6:00 PM
625 15:00 3:00 PM
500 12:00 12:00 PM
375 09:00 9:00 AM
250 06:00 6:00 AM
125 03:00 3:00 AM
075 01:30 1:30 AM
000 00:00 12:00 AM

As you have seen from the examples above, the basic metric time notation is with 3 digits that have leading zeros if needed.

3. New Time Periods

a. New Time Periods Overview

To effectively talk about a metric time standard we have to introduce a set of new time keeping “periods”. These are not official terms. I created the concept of “time periods” myself:

  • Major Time Period
  • Minor Time Period
b. Major Time Periods and Notation
Metric Time - Major Notation
Metric Time – Major Notation

The major time period consists of the 3 digits to the left of the decimal point (if it is present) which are the integer digits you see above. Each digit represents a decimal portion of the time.

  • A full day is broken out into 10 parts called a deciday.
  • A deciday is then broken in 10 more parts called a centiday.
  • A centiday is broken into 10 more parts called a milliday.

I think you can see the pattern here. For most metric time implementations, these terms are pretty standard. Below is a table that shows these time periods, their fraction of a day, and approximate amount of time.

Decidays: The first digit (left most) represents the number of decidays (or 1/10th of a day). Each deciday equals about 2 hours and 24 minutes. 10 decidays equal 24 hours.

Centidays: The second digit (center) represents the number of centidays (1/100th of a day). Each centiday equals 14 minutes and 24 seconds. 10 centidays equal 2 hours and 24 minutes which is 1 deciday.

Millidays: The third digit (right most) represents the number of millidays (1/1,000th of a day). Each milliday equals 1 minutes and 26 seconds. 10 millidays equal 14 minutes and 24 seconds which is 1 centiday.

Major Time Periods
Metric Part Metric Period fraction of day ~ 24 hour val
100 1 deciday 1/10 2 hrs 24 min
010 1 centiday 1/100 14 min 24 sec
001 1 milliday 1/1,000 1 min 26 sec
c. Minor Time Periods and Notation
Metric Time - Minor Notation
Metric Time – Minor Notation

The following terms are NOT common terms. I created these too.

From there, metric time is broken in to a few more steps that I call the Minor Time Periods, so we have a higher level of graduation:

  • A milliday is broken into 10 more parts called a decond.
  • A decond is broken into 10 more parts called a centond.
  • A centond is broken into 10 more parts called a millond.

Here you can see we continue the metric pattern.

Deconds: The first digit to the right of the decimal point represents the number of deconds (or 1/10,000th of a day) in the time. Each decond equals about 8.64 seconds. 10 deconds equals 1 min and 26 seconds or 1 milliday.

Centonds: The second digit to the right of the decimal point represents the number of centonds (1/100,000th of a day). Each centond equals 0.864 seconds. 10 centonds equals 8.64 seconds which is 1 decond.

Millonds: The third digit to the right of the decimal point represents the number of millonds (1/1,000,000th of a day). Each millond equals 0.0864 seconds. 10 millonds equal 0.864 seconds which is 1 centond.

Below is a table that shows these time periods, their fraction of a day, and approximate amount of time:

Minor Time Periods
Metric Part Metric Period fraction of day ~ 24 hour val
000.1 1 decond 1/10,000 8.64 sec
000.01 1 centond 1/100,000 0.864 sec
000.001 1 millond 1/1,000,000 0.0864 sec

As you may have noticed from the examples above, the minor time notation is with the digits to the right of the decimal place if it is present. Each digit represents a decimal portion of the time. The places to the right of the decimal point are only there if it is needed, but for general time usage it is generally limited to 3 or less places, but can definitely be extended for mathematical purposes.

d. Example Metric Times

Here is a table which breaks down a variety of metric times to 24 hour equivalent so you can see it some more:

Time Conversion – Metric to 24 Hour
Metric 24 hour val ~ 24 hour clock
1000 10 deciday 24 hours 24 hours
750 7.5 deciday 18 hours 18 hours
500 5 deciday 12 hours 12 hours
250 2.5 deciday 6 hours 6 hours
125 1.25 deciday 3 hours 3 hours
075 7.5 centiday 1.5 hours 1.5 hours
041 4.1 centiday 58 min 36 sec 1 hour
020 2 centiday 29 min 48 sec 30 minutes
010 1 centiday 14 min 24 sec 15 minutes
006 6 milliday 9 min 38 sec 10 minutes
003.4 3.4 milliday 4 min 53 sec 5 minutes
000.7 7 decond 1.05 min 1 minute
000.01 1 centond 0.864 sec 1 second

4. Metric Time Period Notation

a. Denoting Metric Time

From Swatch’s beats implementation from 1988 they use the @ symbol for their time notation (@500) which I have really liked in the past, however, in the last decade or so of internet advancement the @ symbol has received considerable use as mentions or tagging people in various social media sites, so we may have to sunset that character idea and find some other way. I am not sure what other character we could use, since most other characters on the keyboard have some specific everyday use. If you find another good character which would avoid confusion let me know!

b. Adding Metric Time to a Date

This format also allows us to more easily attach a metric time to a date such as by just adding the full decimal value to the end of a purely numerical date (yyyy-mm-dd.ttt):

  • 2026-2-21.999
  • 2026-2-21.5
  • 2026-2-21.25
  • 2026-2-21.075231

This becomes even more seemingly futuristic if we use the period as the date separator as some are want to due (even though I really do NOT like this format due to readability reasons). Consider this format: yyy.mm.dd.ttt. Here are some examples:

  • 2026.2.21.999
  • 2026.2.21.5
  • 2026.2.21.25
  • 2026.2.21.075231

Star Trek’s Star Date format uses a form of decimal time too.

5. One Unchanging Time Zone

Applying these two steps is very, very, very important in order to make this standard actually useful and not just another pain in our temporal asses. Listen closely:

  1. GMT (+0) – We shall not give in to hubris like Swatch did which absolutely killed the potential usefulness of their Internet Time watches. We shall set our metric time to ONE time zone, and for that we shall use Greenwich Mean Time (GMT +0) which is the default base time zone from which ALL of the global time zones are based off of.
  2. Never Adjust Time – Also, this metric time standard is NEVER adjusted for time zone differences and NEVER uses Daylight Saving Time. Terran Universal Time is what it is no matter where you are in the world. It is NEVER adjusted otherwise this idea becomes completely useless. When it is 073 in Indonesia, it is 073 in the United States and in China too. Its unchanging nature is a powerful feature which will make this actually useful in today’s global world with Time Zones and Daylight Savings Time and the internet.
  3. One Date – This also brings into being a single date based on this unchanging GMT +0 based TUT.

C. Time Conversions

1. Converting from Standard to Metric

Lets try converting a standard time to a metric one by using the example of 9:21 pm.

  1. Convert 12 Hour Time to 24 Hour Time
    1. 9:21 pm
    2. becomes 21:21
  2. Convert Hours to Minutes
    1. (hours) * (minutes per hour)
    2. (21) * (60)
    3. 1,260
  3. Add in Minutes From Base Time
    1. (minutes) + (base time minutes)
    2. (1,260) + (21)
    3. 1281
  4. Convert Minutes to Seconds
    1. (minutes) * (seconds per minute)
    2. (1,281) * (60)
    3. 76,860
  5. Convert Seconds to Deciseconds
    1. (seconds) * (deciseconds per second)
    2. (76,860) * (10)
    3. 768,600
  6. Convert to Metric Time
    1. (deciseconds) / (deciseconds per day)
    2. (768,600) / (864,000)
    3. 0.889583
    4. Mulitply that times 1000 to move the decimal place 3 to the left and then truncate 3 decimal places
    5. 889.583

2. Converting Metric to Standard time

a. Converting in One Process

A quick example of metric time calculation: metric time 123.456 would be:

  1. Convert Metric Time to Deciseconds
    1. (metric time / 1000) x (deciseconds in day)
    2. ( 123.456 / 1000) x (864,000)
    3. 106,665.984 deciseconds
  2. Convert Deciseconds to Number of Hours
    1. (deciseconds in time) / (deciseconds per hour)
    2. (106,665.984) / (36,000)
    3. 2.962944
    4. 2 hours
  3. Get Number of Minutes
    1. (remainder of hours) * (minutes per hour)
    2. (0.962944) * (60)
    3. 57.77664
    4. 57 minutes
  4. Get Number of Seconds
    1. (remainder minutes) * (seconds per minute)
    2. (0.77664) * (60)
    3. 46.5984 seconds
  5. Add It All Together
    1. (hours) + (minutes) + (seconds)
    2. (2) + (57) + (45.5984)
    3. 2 hours 57 minutes and 45.5984 seconds
    4. about 2:57am
b. Processing Major and Minor Periods Separately
i. Converting Major Time Periods

As a quick example of metric time calculation: metric time 123 would be:

Metric Time - Converting Major Time Periods
Metric Time – Converting Major Time Periods
  • 1 deciday + 2 centidays + 3 millidays = ??
  • 1 (2 hours & 24 min) + 2 (14 min & 24 sec) + 3 (1 min & 26 sec) = ??
  • (2 hours & 24 min) + (28 min & 48 sec) + (4 min & 18 sec) = ??
  • 2 hours 57 min 6 seconds
  • about 2:57am
ii. Converting Minor Time Periods

As a quick example of metric time calculation: metric time 000.456 would be:

Metric Time - Converting Minor Time Periods
Metric Time – Converting Minor Time Periods
  • 4 deconds + 5 centonds + 6 millonds =
  • 4 (8.64 secs) + 5 (0.864 sec) + 6 (0.0864 sec) =
  • (34.56 secs) + (4.32 secs) + (0.5184 sec) =
  • 39.3984 seconds
iii. Add Them Together

Now we can add the Major and Minor periods together:

  • (major period) + (minor period)
  • (2 hours 57 min 6 seconds) + (39.3984 seconds)
  • 2 hours 57 min 45.3984 seconds (off by 0.2 due to rounding for base values)
  • about 2:57am

D. Benefits of a Using a Universal Metric Time

1. Mathematical Flexibility

Overview

Because of the extreme flexibility of the metric based time measurement we can easily covert metric time into the following mathematical formats which will be very useful for various calculations:

  1. percentage
  2. decimal
  3. exponents
a. Percentage

We can express metric time as percentage of a full day by shifting the decimal point 1 place to the left (or dividing by 10) to get the percentage value:

  • 875 = 87.5% of a day
  • 600 = 60%
  • 231 = 23.1%
  • 080 = 8%
  • 001 = 0.1%
b. Decimal

We can express metric time as a decimal of a full day by shifting the decimal point 3 places to the left (or dividing by 1000) to get the decimal value:

  • 875 = 0.875 of a day.
  • 600 = .6
  • 231 = 0.231
  • 080 = 0.08
  • 001 = 0.001
c. Exponents

We can take the decimal value from above and from that we can derive the exponent form:

  • 600 = 6 x 10-1
  • 231 = 231 x 10-3
  • 080 = 8 x 10-2
  • 001 = 1 x 10-3
d. Examples

Here are some more examples of all of this below:

metric time metric period percent decimal exponent
800 8 deciday 80% 0.8 8 x 10-1
030 3 centiday 3% 0.03 3 x 10-2
009 9 milliday 0.9% 0.009 9 x 10-3
000.7 7 decond 0.07 % 0.0007 7 x 10-4
000.03 3 centond 0.003% 0.00003 3 x 10-5
000.001 1 millond 0.0001% 0.000001 1 x 10-6

Microdays: With millonds being at 10-6 this could be referred to as a microday (0.0864 seconds).

Nanodays: A nanoday (10-9) would be 0.0000864 seconds or 0.864 centonds

This would be useful for industries times are arranged and are relevant across time zones such as train, bus, air travel, aerospace, and military to ease time change, and to give people a better perspective on relative time because it does not ever change.

This flexibility is a powerful reason why mathematicians and scientists have discussed a metric time standard.

2. Cross-Time Zone Media

The various media which regularly publish materials with time stamps such as:

  • TV guides
  • newspapers
  • magazines
  • blogs
  • websites
  • streaming services

…could use metric time so they do not have to worry about time zone changes, Daylight Saving Time, or travelers traveling and being time confused because of jet lag, etc. This gives a much more consistent perspective for time because it never changes.

3. Standardizing Times for Celestial or Other Global Events

We could standardize times for many celestial or other global events. Currently, due to the various time zones they appear at different times which creates confusion. The use of a his could allow us, depending on the event, to have only 1 time to which everyone could reference which would relieve all confusion. Although some events are time zone dependent, so it could be useful on an event by event basis.

4. Different Presentation

A metric time standard as presented here removes itself from the standard flow of daily time keeping because of the different format, so its use will be more apparent due to its presentational separation – no confusion between 12 hour, 24 hour, or metric time standards where ever they are found:

2:57am = 02:57 (0257) = 123

5. Hand-Based Clocks Make More Sense

Times will no longer need to be duplicated on clock faces causing potential confusion – no 12:00 am or 12:00 pm. Clock hands will directly relate to percentage of day and centiday as you can see in the French Republic examples above.

6. Fewer Characters

The 12 and 24 hour standards use 4 to 8 characters where metric time uses only 3 characters which may be very useful for smaller digital displays where space is at a premium.

  • 12:00 pm = 12:00 (or 1200) = 500
  • 9:00 am = 09:00 (or 0900) = 375

Also, because there are fewer characters it reduces the cognitive load required to interpret the time

7. Easier Math

Metric time can be expressed as a percentage of day which makes math very easy especially when the time is expressed in decimal form (0.999 days).

They would tell you that 3.8 decidays work at $10 per deciday earns you $38. They would know almost intuitively that a toilet leaking 2ml a milliday is going to lose two litres every day.

At 16km per microday, they will patiently explain, the rocket is going to travel 16,000,000km in one day.

Fifth, it’s so much easier to talk about longer times. Two and a half days? That’s 52 hours. Three days and 6 hours? That’s simply 3.25 days. Since an hour is now a nice decimal fraction of a day, these conversions become easy.

8. Easier for Programming

Programming date/time math is hard and super annoying. I have been working on writing the code for my calendar reform post and this one, and it is a pain in the ass. Performing date math with decimal time would be super easy and would keep programmers from cursing so much whenever they had to work with time, and would prevent many programming and translational errors.

9. Non-Connected Timepieces

Non-connected clocks such as wind up watches, standard wall clocks, as well as the infamous car and VCR clocks could use this time and not have to worry about time zone changes or the frustration of Daylight Saving Time changes. They would display one time all of the time and never be wrong.

10. Easier Conversion To and From the 24 Hour Clock

This is a really minor benefit, but it is a smidge easier (skipping one step) to convert to and from the 24 hour time to metric time.

E. Examples of Implementation Changes

1. General

    The working day could become three decidays with a centiday break for morning tea and four centidays for lunch. It would take about a milliday to brew coffee. The definition of a late train could be re-jigged without anyone noticing. There are some great examples here: Metric Time (Math with Bad Drawings, Apr 2015) – although, they lack vision =)

    2. The Metric Time Rag – A Cross Time Zone Publication

    If we revisit out fictional magazine from earlier, The Metric Time Rag (TMTR), let’s take a look at what they were looking to do and how the time/date math starts using this Terran Universal Time:

    1. arrange an video chat with all 3 regions
    2. arrange itineraries for travel for people from all 3 regions to a convention in Indonesia called SandsCon
    3. determine global publication times and dates for their regional magazines
    4. call the Australia’s consulate to arrange for travel visas to expand TMTR’s coverage area
    5. make a call to their software vendor’s call center located in India.

    They only have 1 time and date standard to work with – TST 000 6 Apr 2019. Nothing else to compare or do math with. Just this one unchanging global date/time standard forever making all international time work easy.

    F. Disadvantages with Metric Time (2)

    1. Slightly Reduced Gradation

    Has a potentially slightly reduced graduation as compared to the 12 or 24 hour clocks and its sexidecimal time.

    2. Redefine the Base Time

    Will have to redefine the metric second (decond) from what it is now (1 sec) to 0.864 of a standard second which is eminently doable.

    G. Technological Tools

    We need technological tools make this universally usable and available as a standard, such as:

    • A centralized TUT website which will and aggregate and disseminate all of the information below.
    • Desktop OS platforms updates such as Windows, Linux, Unix, and Mac OS
    • Mobile OS platforms updates such as Chrome and iOS
    • CMS plugins or updates such as for Drupal, Joomla, and WordPress
    • Various updates and plugins for office suites
    • Programmatic tools to implement and work with TUT in various programming languages such as C++, JAVA, PHP, JavaScript, etc…

    Conclusion

    Once people will be used to this new fandangled metric time thing called Terran Universal Time (TUT) and have it apart of how they think and see the world, they will see how it impacts their life, simplifying things. Just like they got used their standard 12 hour clock throughout their lives and just like military members and others get used to the 24 hour clock, they can also easily get used to a metric based time system.

    Learn More

    Swatch Internet Time

    Decimal or Metric Time

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