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The first ship to successfully circumnavigate the world was the Nao Victoria. It was originally part of Magellan's fleet. All of the other ships (the Trinidad, the San Antonio, ConcepciΓ³n and the Santiago), Ferdinand Magellan himself, and most of the sailors of the Victoria had already either been killed, or turned back before this. When the Victoria finally returned to port, under the command of Captain Juan Sebastian de Elcano, they discovered, even though their logs were kept meticulously, that they found they were a day behind everyone else. This, eventually, led to the establishment of the International Date Line.
Source: Laurence Bergreen, Over the Edge of the World: Magellan's Terrifying Circumnavigation of the Globe, Harper-Collins Publishers, 2003.