World Clock Pro is a simple and powerful world clock.

Features

• Add cities and timezones like GMT and UTC with a few key strokes
• Convert international time with a drag of a cursor
• Schedule international calls and meetings and add them to your calendar
• Add Interactive Widget to your Today's View (OS X 10.10 Yosemite only): quickly peek and see what time it is in the other location, drag the line to convert time, so you can find a time that suits quick, without getting distracted from whatever you were doing

Easily tell what time it is with clocks that change color with time of day:

• black for evening and night
• white for morning
• green for working hours