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A. 不同时间的具体日期
原标题:Find distinct dates from times

我的阵列如下:

[Wed Jan 04 21:56:08 UTC 2012, Thu Jan 12:58:36 UTC 2012, Thu Jan 12 22:13:24 UTC 2012, Thu Jan 12 22:13:34 UTC 2012]

鲁比拉只有这一阵列才算出具体天数的最佳方式是什么? 2012年1月12日是三倍,但只算一次是我只关心月/日,而不是计算阵列中值的实际时间。

因此,过滤后这一阵列的总数应为2个不同的月/日/年值的2个。

最佳回答

这些指示或日期是否反对? 假设后一种情况,并更新阵列如下:datetime_arr

date_arr = datetime_arr.map &:to_date
# => [Wed, 04 Jan 2012, Thu, 12 Jan 2012, Thu, 12 Jan 2012, Thu, 12 Jan 2012]

date_arr.uniq!
# => [Wed, 04 Jan 2012, Thu, 12 Jan 2012]

date_arr.length
# => 2

我希望能够提供帮助。

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