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Earth Clock is a map of the world that displays the local time in any and every time zone and takes account of daylight saving time where relevant. It is useful for all long distance communication as well being a way to understand how night and day changes across our world and across the seasons.

As you move the cursor over the map, the time and date in the time zone under the cursor is displayed. Or if you are using a touch screen tapping on any area of land displays the local time. Touch and dragging on the sea will drag the map from side to side.

The map is continually changing to show night and day moving around the globe. The curvature of the night shadow changes with the seasons. Where the moon is above the horizon providing additional light, the night shadow is lighter. The level of brightness is set according to the current phase of the moon.

The map uses satellite imagery. As towns and cities move into the night shadow, their night lights appear, visible from space. Importantly, all the base map data is built into the application meaning that Earth Clock does not require your device to be connected to the internet.