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计算实际时间天数(时间范围去重)

image.png
举例 1.2-1.5 , 1.4-1.6
去重后就是 1.2 1.3 1.4 1.5 .16 一共5天


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function getDays (ranges: readonly (readonly [number, number])[]): number {
  const days = new Set<number>();
  for (const [start, end] of ranges) {
    for (let time = start; end >= time; time += 8.64e7) {
      days.add(time);
    }
  }
  return days.size;
}

getDays([
  [Date.parse("2021-01-02"), Date.parse("2021-01-05")],
  [Date.parse("2021-01-04"), Date.parse("2021-01-06")],
]);

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