No? UTC by definition doesn’t know time zones.
Let’s say the European goes to work at 8 o’clock UTC. The American in this example goes to work 6 hours later at 14 o’clock UTC. Both now exactly when the other one is in office. Time zones aren’t needed here.
Time zones are an invention to keep the zero hour (for hour counting) at about the same local time - midnight. Midnight was easier to determine that UTC (or GMT). A peasant could do it in a day without the help of expensive tools everywhere on Earth. As a matter of fact almost each city in medieval times had its own local time. To get that sorted out they where clustered into time zones.
You only see greyscale? O_o