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DateTime[] starts = { DateTime.Now, DateTime.Now.AddDays(-12) };
DateTime[] ends = { DateTime.Now.AddMonths(1), DateTime.Now.AddDays(1) };
if (starts.Max() < ends.Min())
Response.Write(string.Concat(starts.Max().ToString(), " - ", ends.Min().ToString()));
else
Response.Write("没有重叠时间段");
DateTime end = System.DateTime.Now.AddMonths(1);
DateTime star1 = System.DateTime.Now;
DateTime end2 = System.DateTime.Now.AddMonths(1).AddDays(2);
DateTime star2 = System.DateTime.Now;