A “clock to copper watch” refers to the process of converting the time displayed on a digital clock to an equivalent time on an analog watch with a copper face. This conversion is particularly useful when one only has access to a digital clock but needs to set an analog watch accurately.
The importance of being able to convert time from a digital clock to an analog watch extends beyond the convenience of setting the time. It also has historical significance. Before digital clocks became widely available, people relied on analog watches to tell time. As a result, it was essential to be able to convert time between the two formats.