Hexadecimal time
Hexadecimal time is the representation of the time of day as a hexadecimal number in the interval [0,1).
The day is divided in 10_{16} (sixteen) hexadecimal hours, each hour in 100_{16} (two hundred and fiftysix) hexadecimal minutes and each minute in 10_{16} (sixteen) hexadecimal seconds.
Contents
History
The time may have been used during the Tang Dynasty (7th10th centuries) in China.
This time format was proposed by the SwedishAmerican engineer John W. Nystrom in 1863 as part of his tonal system.
In 1997, the American Mark Vincent Rogers of Intuitor proposed a similar system of hexadecimal time and implemented it in JavaScript as the Hexclock.
The system of Rogers
A day is unity, or 1, and any fraction thereof can be shown with digits to the right of the hexadecimal separator.
So the day begins at midnight with .0000 and one hexadecimal second after midnight is .0001.
Noon is .8000 (one half), one hexadecimal second before was .7FFF and one hexadecimal second before next midnight will be .FFFF.
Intuitorhextime may also be formatted with an underscore separating hexadecimal hours, minutes and seconds. For example:
Clock
Hex  Hex (Boardman)  ISO 8601  Comment 

.0100  0_10_0  00:05:37.5  
.0200  0_20_0  00:11:15  
.0400  0_40_0  00:22:30  
.0800  0_80_0  00:45:00  
.1000  1_00_0  01:30:00  1.5÷24 = 1÷16 = 0.1 
.8000  8_00_0  12:00:00  12÷24 = 8÷16 = 0.8 
.F000  F_00_0  22:30:00  22.5÷24 = 15÷16 = 0.F 
.F800  F_80_0  23:15:00 
Conversions
Hex  hexsec base 16 
hexsec base 10 
Traditional  

1 day  =  10000  =  65536  =  24 h 
1 hexadecimal hour  =  1000  =  4096  =  1 h 30 min 
1 hexadecimal maxime  =  100  =  256  =  5 min 37.5 sec 
1 hexadecimal minute  =  10  =  16  =  21.09375 sec 
1 hexadecimal second  =  1  =  1  =  1.318359375 sec 
1 second  =  0.C22E4  =  0.75851  =  1 sec 
See also
References
External links

 Hexadecimal Time Applet  with digital and analogue representations.
 Hexclock  local time as a hexadecimal number
 True Binary Time  local time as a binary number
 Analogue hexadecimal clock  Florence Mean Time
 Geektime.org  different approach, based on "hexseconds"
 JS hexclock  Another simple JavaScript hexadecimal clock
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