Water clocks are invented by the Greeks.

The mechanical clock is invented in England

The Chinese and Egyptians develop simple sundials; easy to build, so a huge variety evolves all over the world during this time period.

The first known pocket watch is created, but the inventor remains unknown. The watch, crafted in bronze, depicts Saint George slaying a dragon on the front and the Crucifixion on the back.

The first pendulum clock is patented by Christian Huygens.

Nicolas Rieussec files a patent for a "timekeeper or device to measure the distance traveled, called a seconds chronograph". This is the birth of the era of the chronograph, or stopwatch.

Abraham-Louis Breguet creates a watch to fit on a wrist (the first wristwatch), for Caroline Murat, Queen of Naples.

The first Caesium atomic clock, which keeps accurate time to within a few seconds every 100,000 years, is invented by Dr. Essen of the National Physical Laboratory.

America's Hamilton Watch Company produces the first successful electric watch

Seiko introduces its first quartz-crystal analog wristwatch.

Seiko began to develop watches with computing ability.