c#获取上个月第一天和最后一天

//获取上个月第一天 2019-02-01
Convert.ToDateTime(DateTime.Now.AddDays(1 - DateTime.Now.Day).AddMonths(-1).ToLongDateString()).ToString("yyyy-MM-dd");

//获取上个月最后一天 2019-02-28
Convert.ToDateTime(DateTime.Now.AddDays(1 - DateTime.Now.Day).AddDays(-1).ToLongDateString()).ToString("yyyy-MM-dd");

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转载自blog.csdn.net/liangmengbk/article/details/88714982
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