On one day my friend Olivia has her birthday. Two days later it is the birthday of her elder twin, Oliver. Please explain.

Oliver was born on March 1 on a plane flying eastwards over the Pacific. A few seconds later the plane crosses the International Date Line, and Olivia is born. She is thus born on February 28, making her the ‘younger’ sister with a calendar birth date one day before her brother’s. On leap years, however, Olivia will celebrate her birthday two calendar days before her older twin.

On one day my friend Olivia has her birthday. Two days later it is the birthday of her elder twin, Oliver. Please explain.

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