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Decimal time (10/100/100)
Decimal time (10/10/10/10/10)
Decimal time (100000)
Swatch time
"Standard" sexagesimal time (2*12/60/60)
"Standard" sexagesimal time (24h)
Kangaroo time
Hex time
Hex2 time
True hex time
Binary time (2^17)
Factorial time
Fibonacci time
Prime time (11/51/101)
Prime time (2/3/5/7/11/13)
Duodecimal time (12/144/144)
Unlucky time (13^4)
Devil's time (666)
Replacement display 2x12h>2x5h
All decimal clocks
Make your custom clock
All of them (CPU intensive!)
Reasoning