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3500 BC – First sundials built in ancient Egypt after they were imported from Babylon, with many ancient structures were built to mark the passage of time and determine arrival of planting seasons and harvest times.
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1400 BC – Some cultures mark the passage of time by measuring time it takes to burn oil, incense and candles.
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300 AD – Introduction of sand glass clocks(or hourglasses).
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885 – Candles with time markings introduced to medieval Europe.
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1092 – First mechanical water clock created by Chinese innovator Su Sung.
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Early 1500s – Appearance of first small domestic (table) clocks.
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1541 – First public tower clock fixed on one of the towers in Hampton Court Palace, England.
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1895 – First modern electric clock created by Frank Hope-Jones. This clock became base of all modern clocks that are created today.
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1949 – First atomic clock created by United States National Institute of Standards and Technology (NITS).
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Late 1990s – Over half a billion watches are sold every year.