Yeah, it's because of an anomaly with the calendar. The length of time we assign to a standard day isn't precise for measuring a standard year because the length of a day and the length of a year have nothing to do with each other — one's about the Earth's rotation and the other's about revolution around the sun. But rather than making a whole new calendar, we just kinda taped some band-aids over the one we had, and one of those is throwing in an extra day every four years to make stuff balance out.
[...Why are they even talking about this again? Whatever.]
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[...Why are they even talking about this again? Whatever.]
And you know what? Whatever floats his boat.