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The short answer is that Mondays become Tuesdays at the international date line, a boundary that runs through the Pacific Ocean.

She performed in Japan on Saturday night before a flight across nine time zones and the international date line to reach the U.S.

Swift wrapped up the last of four shows in Japan on Saturday night, then hopped on a private plane at Haneda Airport for a flight across nine time zones and the international date line.

The prospect of this race against time, crossing nine time zones and the international date line, has fired imaginations, and speculation, for weeks.

Sports journalists and the Embassy of Japan become overnight experts on the international date line and travel logistics.