Deci-Clock

Current Deci-Time and Date:

© Created by Arno van Werven on May 28, 2004

It has always bothered me that our clock has 24 hours a day, 60 minutes per hour, and 60 seconds per minute.

I am a fan of the metric and decimal system.

Untill now it was impossible for me to realize my dream clock, but with a little javascript it is now reality.

While creating it, I made some 'slight' changes to our calender too.

Comments, corrections, and/or additions are more than welcome.

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1 year = 15 months Monam, Dinam, Trinam, Tetram, Pentam, Hexam, Heptam, Octam, Enneam, Decam, Mondecam, Didecam, Tridecam, Tetdecam, Pentdecam
1 year = 73 weeks some things just don't fit nicely
1 year = 365 days it takes the Earth slightly more than 365 days to orbit the Sun (no way around it)
1 month = 5 weeks the last month has only 3 weeks
1 month = 25 days  
1 week = 5 days Mercury, Venus, Mars, Jupiter, Saturn
  leap days are added at the end of the year according to this rule
1 day = 10 hours Noon will be 5 hours, of course
1 hour = 100 minutes  
1 minute = 100 seconds 1 deci-day = 10 deci-hours = 1,000 deci-minutes = 100,000 deci-seconds

The New Year starts when the Sun is at the Point of Aries.

In other words, the year starts at the vernal (spring) equinox.

Since that is not every year on the same day, the vernal equinox of 2000 was used.

So this new calendar started on March 20, 2000 with Mercury: 2000 Monam 1

The start of the seasons was changed too.

Instead of starting the summer on the longest day, June 21, it is now spaced so that the longest day is in the middle of summer.

Summer starts: Trinam 1 (old calendar, may 9)

Fall starts: Heptam 1 (old calendar, aug 17)

Winter starts: Decam 1 (old calendar, oct 31)

Spring starts: Tetdecam 1 (old calendar, feb 8)

 

Deci-Time Conversion Table
Deci time
Old time
Deci time
Old time
Deci time
Old time
Deci time
Old time
Deci time
Old time
Midnight
0:0
00:00
 
Two hours
2:0
04:48
 
Four hours
4:0
09:36
 
Six hours
6:0
14:24
 
Eight hours
8:0
19:12
quarter after
0:25
00:36
 
quarter after two
2:25
05:24
 
quarter after four
4:25
10:12
 
quarter after six
6:25
15:00
 
quarter after eight
8:25
19:48
half
0:50
01:12
 
two and a half
2:50
06:00
 
four and a half
4:50
10:48
 
six and a half
6:50
15:36
 
eight and a half
8:50
20:24
quarter to one
0:75
01:48
 
quarter to three
2:75
06:36
 
quarter to five
4:75
11:24
 
quarter to seven
6:75
16:12
 
quarter to nine
8:75
21:00
One hour
1:0
02:24
 
Three hours
3:0
07:12
 
Five hours
5:0
12:00
 
Seven hours
7:0
16:48
 
Nine hour
9:0
21:36
quarter after one
1:25
03:00
 
quarter after three
3:25
07:48
 
quarter after five
5:25
12:36
 
quarter after seven
7:25
17:24
 
quarter after nine
9:25
22:12
one and a half
1:50
03:36
 
three and a half
3:50
08:24
 
five and a half
5:50
13:12
 
seven and a half
7:50
18:00
 
nine and a half
9:50
22:48
quarter to two
1:75
04:12
 
quarter to four
3:75
09:00
 
quarter to six
5:75
13:48
 
quarter to eight
7:75
18:36
 
quarter to ten
9:75
23:24

1 deci-hour = 2.4 old hours = 2 old hours + 24 old minutes = 144 old minutes
1 deci-minute = 1.44 old minutes
1 deci-second = 0.864 old seconds

Deci-Calendar Conversion Table
Monam / Month 1   Dinam / Month 2   Trinam / Month 3   Tetram / Month 4   Pentam / Month 5
Deci-Calendar Old Cal   Deci-Calendar Old Cal   Deci-Calendar Old Cal   Deci-Calendar Old Cal   Deci-Calendar Old Cal
01 Mercury 20 mar   01 Mercury 14 apr   01 Mercury 09 may   01 Mercury 03 june   01 Mercury 28 june
02 Venus 21 mar   02 Venus 15 apr   02 Venus 10 may   02 Venus 04 june   02 Venus 29 june
03 Mars 22 mar   03 Mars 16 apr   03 Mars 11 may   03 Mars 05 june   03 Mars 30 june
04 Jupiter 23 mar   04 Jupiter 17 apr   04 Jupiter 12 may   04 Jupiter 06 june   04 Jupiter 01 july
05 Saturn 24 mar   05 Saturn 18 apr   05 Saturn 13 may   05 Saturn 07 june   05 Saturn 02 july
                                     
06 Mercury 25 mar   06 Mercury 19 apr   06 Mercury 14 may   06 Mercury 08 june   06 Mercury 03 july
07 Venus 26 mar   07 Venus 20 apr   07 Venus 15 may   07 Venus 09 june   07 Venus 04 july
08 Mars 27 mar   08 Mars 21 apr   08 Mars 16 may   08 Mars 10 june   08 Mars 05 july
09 Jupiter 28 mar   09 Jupiter 22 apr   09 Jupiter 17 may   09 Jupiter 11 june   09 Jupiter 06 july
10 Saturn 29 mar   10 Saturn 23 apr   10 Saturn 18 may   10 Saturn 12 june   10 Saturn 07 july
                                     
11 Mercury 30 mar   11 Mercury 24 apr   11 Mercury 19 may   11 Mercury 13 june   11 Mercury 08 july
12 Venus 31 mar   12 Venus 25 apr   12 Venus 20 may   12 Venus 14 june   12 Venus 09 july
13 Mars 01 apr   13 Mars 26 apr   13 Mars 21 may   13 Mars 15 june   13 Mars 10 july
14 Jupiter 02 apr   14 Jupiter 27 apr   14 Jupiter 22 may   14 Jupiter 16 june   14 Jupiter 11 july
15 Saturn 03 apr   15 Saturn 28 apr   15 Saturn 23 may   15 Saturn 17 june   15 Saturn 12 july
                                     
16 Mercury 04 apr   16 Mercury 29 apr   16 Mercury 24 may   16 Mercury 18 june   16 Mercury 13 july
17 Venus 05 apr   17 Venus 30 apr   17 Venus 25 may   17 Venus 19 june   17 Venus 14 july
18 Mars 06 apr   18 Mars 01 may   18 Mars 26 may   18 Mars 20 june   18 Mars 15 july
19 Jupiter 07 apr   19 Jupiter 02 may   19 Jupiter 27 may   19 Jupiter 21 june   19 Jupiter 16 july
20 Saturn 08 apr   20 Saturn 03 may   20 Saturn 28 may   20 Saturn 22 june   20 Saturn 17 july
                                     
21 Mercury 09 apr   21 Mercury 04 may   21 Mercury 29 may   21 Mercury 23 june   21 Mercury 18 july
22 Venus 10 apr   22 Venus 05 may   22 Venus 30 may   22 Venus 24 june   22 Venus 19 july
23 Mars 11 apr   23 Mars 06 may   23 Mars 31 may   23 Mars 25 june   23 Mars 20 july
24 Jupiter 12 apr   24 Jupiter 07 may   24 Jupiter 01 june   24 Jupiter 26 june   24 Jupiter 21 july
25 Saturn 13 apr   25 Saturn 08 may   25 Saturn 02 june   25 Saturn 27 june   25 Saturn 22 july
                                     
                                     
Hexam / Month 6   Heptam / Month 7   Octam / Month 8   Enneam / Month 9   Decam / Month 10
Deci-Calendar Old Cal   Deci-Calendar Old Cal   Deci-Calendar Old Cal   Deci-Calendar Old Cal   Deci-Calendar Old Cal
01 Mercury 23 july   01 Mercury 17 aug   01 Mercury 11 sept   01 Mercury 06 oct   01 Mercury 31 oct
02 Venus 24 july   02 Venus 18 aug   02 Venus 12 sept   02 Venus 07 oct   02 Venus 01 nov
03 Mars 25 july   03 Mars 19 aug   03 Mars 13 sept   03 Mars 08 oct   03 Mars 02 nov
04 Jupiter 26 july   04 Jupiter 20 aug   04 Jupiter 14 sept   04 Jupiter 09 oct   04 Jupiter 03 nov
05 Saturn 27 july   05 Saturn 21 aug   05 Saturn 15 sept   05 Saturn 10 oct   05 Saturn 04 nov
                                     
06 Mercury 28 july   06 Mercury 22 aug   06 Mercury 16 sept   06 Mercury 11 oct   06 Mercury 05 nov
07 Venus 29 july   07 Venus 23 aug   07 Venus 17 sept   07 Venus 12 oct   07 Venus 06 nov
08 Mars 30 july   08 Mars 24 aug   08 Mars 18 sept   08 Mars 13 oct   08 Mars 07 nov
09 Jupiter 31 july   09 Jupiter 25 aug   09 Jupiter 19 sept   09 Jupiter 14 oct   09 Jupiter 08 nov
10 Saturn 01 aug   10 Saturn 26 aug   10 Saturn 20 sept   10 Saturn 15 oct   10 Saturn 09 nov
                                     
11 Mercury 02 aug   11 Mercury 27 aug   11 Mercury 21 sept   11 Mercury 16 oct   11 Mercury 10 nov
12 Venus 03 aug   12 Venus 28 aug   12 Venus 22 sept   12 Venus 17 oct   12 Venus 11 nov
13 Mars 04 aug   13 Mars 29 aug   13 Mars 23 sept   13 Mars 18 oct   13 Mars 12 nov
14 Jupiter 05 aug   14 Jupiter 30 aug   14 Jupiter 24 sept   14 Jupiter 19 oct   14 Jupiter 13 nov
15 Saturn 06 aug   15 Saturn 31 aug   15 Saturn 25 sept   15 Saturn 20 oct   15 Saturn 14 nov
                                     
16 Mercury 07 aug   16 Mercury 01 sept   16 Mercury 26 sept   16 Mercury 21 oct   16 Mercury 15 nov
17 Venus 08 aug   17 Venus 02 sept   17 Venus 27 sept   17 Venus 22 oct   17 Venus 16 nov
18 Mars 09 aug   18 Mars 03 sept   18 Mars 28 sept   18 Mars 23 oct   18 Mars 17 nov
19 Jupiter 10 aug   19 Jupiter 04 sept   19 Jupiter 29 sept   19 Jupiter 24 oct   19 Jupiter 18 nov
20 Saturn 11 aug   20 Saturn 05 sept   20 Saturn 30 sept   20 Saturn 25 oct   20 Saturn 19 nov
                                     
21 Mercury 12 aug   21 Mercury 06 sept   21 Mercury 01 oct   21 Mercury 26 oct   21 Mercury 20 nov
22 Venus 13 aug   22 Venus 07 sept   22 Venus 02 oct   22 Venus 27 oct   22 Venus 21 nov
23 Mars 14 aug   23 Mars 08 sept   23 Mars 03 oct   23 Mars 28 oct   23 Mars 22 nov
24 Jupiter 15 aug   24 Jupiter 09 sept   24 Jupiter 04 oct   24 Jupiter 29 oct   24 Jupiter 23 nov
25 Saturn 16 aug   25 Saturn 10 sept   25 Saturn 05 oct   25 Saturn 30 oct   25 Saturn 24 nov
                                     
                                     
Mondecam / Month 11   Didecam / Month 12   Tridecam / Month 13   Tetdecam / Month 14   Pentdecam / Month 15
Deci-Calendar Old Cal   Deci-Calendar Old Cal   Deci-Calendar Old Cal   Deci-Calendar Old Cal   Deci-Calendar Old Cal
01 Mercury 25 nov   01 Mercury 20 dec   01 Mercury 14 jan   01 Mercury 08 feb   01 Mercury 05 mar
02 Venus 26 nov   02 Venus 21 dec   02 Venus 15 jan   02 Venus 09 feb   02 Venus 06 mar
03 Mars 27 nov   03 Mars 22 dec   03 Mars 16 jan   03 Mars 10 feb   03 Mars 07 mar
04 Jupiter 28 nov   04 Jupiter 23 dec   04 Jupiter 17 jan   04 Jupiter 11 feb   04 Jupiter 08 mar
05 Saturn 29 nov   05 Saturn 24 dec   05 Saturn 18 jan   05 Saturn 12 feb   05 Saturn 09 mar
                                     
06 Mercury 30 nov   06 Mercury 25 dec   06 Mercury 19 jan   06 Mercury 13 feb   06 Mercury 10 mar
07 Venus 01 dec   07 Venus 26 dec   07 Venus 20 jan   07 Venus 14 feb   07 Venus 11 mar
08 Mars 02 dec   08 Mars 27 dec   08 Mars 21 jan   08 Mars 15 feb   08 Mars 12 mar
09 Jupiter 03 dec   09 Jupiter 28 dec   09 Jupiter 22 jan   09 Jupiter 16 feb   09 Jupiter 13 mar
10 Saturn 04 dec   10 Saturn 29 dec   10 Saturn 23 jan   10 Saturn 17 feb   10 Saturn 14 mar
                                     
11 Mercury 05 dec   11 Mercury 30 dec   11 Mercury 24 jan   11 Mercury 18 feb   11 Mercury 15 mar
12 Venus 06 dec   12 Venus 31 dec   12 Venus 25 jan   12 Venus 19 feb   12 Venus 16 mar
13 Mars 07 dec   13 Mars 01 jan   13 Mars 26 jan   13 Mars 20 feb   13 Mars 17 mar
14 Jupiter 08 dec   14 Jupiter 02 jan   14 Jupiter 27 jan   14 Jupiter 21 feb   14 Jupiter 18 mar
15 Saturn 09 dec   15 Saturn 03 jan   15 Saturn 28 jan   15 Saturn 22 feb   15 Saturn 19 mar
                                     
16 Mercury 10 dec   16 Mercury 04 jan   16 Mercury 29 jan   16 Mercury 23 feb        
17 Venus 11 dec   17 Venus 05 jan   17 Venus 30 jan   17 Venus 24 feb        
18 Mars 12 dec   18 Mars 06 jan   18 Mars 31 jan   18 Mars 25 feb        
19 Jupiter 13 dec   19 Jupiter 07 jan   19 Jupiter 01 feb   19 Jupiter 26 feb        
20 Saturn 14 dec   20 Saturn 08 jan   20 Saturn 02 feb   20 Saturn 27 feb        
                                     
21 Mercury 15 dec   21 Mercury 09 jan   21 Mercury 03 feb   21 Mercury 28 feb        
22 Venus 16 dec   22 Venus 10 jan   22 Venus 04 feb   22 Venus 01 mar        
23 Mars 17 dec   23 Mars 11 jan   23 Mars 05 feb   23 Mars 02 mar        
24 Jupiter 18 dec   24 Jupiter 12 jan   24 Jupiter 06 feb   24 Jupiter 03 mar        
25 Saturn 19 dec   25 Saturn 13 jan   25 Saturn 07 feb   25 Saturn 04 mar        

Leap Rule

It takes the Earth 365.24219 days to orbit the Sun once.

Therefore a day needs to be added to every year that is divisible by four (365.25).

Since that is a little too much, a century year will only have an extra day if it is divisible by 400 (365.2425).

That gives an error of only 3 days per 10,000 years.

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