Skewing of zones

Skewing of zones
Time zones are based on the mean solar time of a particular meridian located in the middle of that zone with the boundaries of each zone located 7 1/2 degrees east and west of the meridian. In practice, zone boundaries are often drawn much farther to the west, and some locations base their time on meridians located far to the east. For example, Spain uses the mean solar time of 15 degrees east when it should use the time based on the prime meridian due to Spain's longitude. The tendency to draw time zone boundaries far to the west of their meridians is to utilize more daylight in the afternoon hours. Many of these locations also use daylight saving time which means that solar noon could occur as late as 2:00 P.M. by the clock.