Binary Clock
Tell the time on a binary clock, where the digits are shown in binary.
Time in ones and zeros
A binary clock displays the time using binary — the base-two number system of computers — showing each digit as a pattern of on and off lights rather than ordinary numerals. This is a working binary clock, both a curiosity and a fun way to get comfortable reading binary.
Read the current time from the binary display.
Reading it, and why it's fun
A binary clock works by showing each part of the time in binary, where each light represents a power of two, and you add up the lit values to read the number. It takes a little practice, which is exactly the appeal — it turns telling the time into a small puzzle and a painless way to learn how binary counting works, since you are decoding real numbers you already know. Binary underlies all computing, where everything ultimately reduces to on and off, ones and zeros, so a binary clock is a tangible glimpse of how machines represent numbers. It is popular with programmers and the technically curious as a desk piece that is functional, geeky, and quietly educational, rewarding the moment the pattern clicks and you can read it at a glance.
Common questions
How do you read a binary clock?
Each light represents a power of two; add up the lit values to get each digit of the time. It takes practice, which is part of the fun.
Why would anyone use one?
As a curiosity and a painless way to learn binary — decoding the time teaches how binary counting works, and binary underlies all computing.
Is anything uploaded?
No. It runs entirely in your browser.