Zone time display clock

A world clock comprising:

• a zone appointing and displaying means including an integrated structure of a map divided into a plurality of substantially equal time zones, a plurality of touch detection terminals disposed at locations on said map corresponding to cities or countries, and time zone display devices arranged beneath the map for providing a separate indication of each time zone on the map;
• touch switch circuit means, including a touch detection circuit connected to said touch detection terminals for amplifying a designated location signal from a designated touch detection terminal to generate a touch signal at an output terminal corresponding to the location of the touch detection terminal on the map as well as the output terminals corresponding to all of the touch detection terminals, a location memory circuit connected to the output terminal corresponding to said location for storing the designated location, a display driver circuit connected between an output of said location memory circuit and said time zone display devices for activating the time zone display device corresponding to the designated location, and a control circuit connected to the output terminals corresponding to all of the touch detection terminals of the touch detection circuit and the location memory circuit for controlling the operation of the memory circuit;
• an electronic clock circuit for generating a reference time signal, corresponding to a reference location, in the form of binary code;
• a time difference generation circuit including an encoder circuit connected to the output of said location memory circuit for generating a time difference signal representing the time difference between the designated location and the reference location, a home location setting circuit for generating a signal representing the time difference between a home location and the reference location, and a switching circuit coupled to outputs of said encoder and home location settling circuits;
• a time difference calculation circuit, including an adder circuit coupled to the reference electronic clock circuit and the switching circuit of said time difference generation circuit with the time of the store operation in the date difference calculation circuit.