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为什么这不给我整整几天的时间？
difftime("2015-04-22", "2014-10-30") Time difference of 173.9583 days
使用Date该类来避免时间戳、夏令时等的额外复杂性。
Date
> as.Date("2015-04-22") - as.Date("2014-10-30") Time difference of 174 days