The Only Clock You’ll Ever Need – is a webapp that compares your computer’s clock to an atomic clock – the most accurate clock in the world and lets you know how accurate your clock is.

atomic clock

When I tested, it told me the clock on my computer was 4.1 seconds behind. It also knew I was in Seattle, WA.

Further, you can find out what the exact time is right now at any of 7 million locations around the world, and compare them. The clock is truly global — you can adjust the first day of the week (Saturday, Sunday or Monday), the date format and the time format.

What clocks do you use? Any mobile apps? Share with us in the comments below.

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