Abstract: A time conversion universal clock includes a time conversion transmission mechanism having one output connected with a time recording element, and another output coupled with a universal time zone map, so that the time recording element drives the universal time zone map in a counter-clockwise direction of rotation. The universal time zone map displays at least some of the world's geographical regions in a polar projection in terms of time zones corresponding thereto. A time conversion transmission mechanism of the time conversion universal clock has a rotary input at a first rotation rate, and provides a rotary output at a second rotation rate; the ratio of the first to the second rotation rates is defined as a transmission ratio, which is made equal to 0.5 by two pulleys, or, alternately gearwheels, of a coupling device of the time conversion mechanism, which engage one another, and have a diameter ratio of two.