It is the sundial.
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It was an old fashion water clock. As a method of telling time, the Sun could be considered the oldest clock in the world. Just by looking at its position relative to the ground, early humans could tell if it was morning, midday, evening, and nighttime. The sundial was developed as a more accurate way to tell this time, and eventually the water clock, mechanical clock and digital clock came along as steadily more accurate versions.
San Marino.
While there is no proof, prostitution is often claimed to be the oldest profession.
Jacobi
Clocks and timing are arbitrary and based on human concepts. There is no 'world clock', so it could never have stopped (or started).