1：第一种方式：
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string
firstDate = "20140226120201";string
secondDate = "20140225115401";DateTime firstDateTemp = DateTime.ParseExact(firstDate, "yyyyMMddHHmmss", new
System.Globalization.CultureInfo("zh-CN", true));DateTime secondDateTemp = DateTime.ParseExact(secondDate, "yyyyMMddHHmmss", new
System.Globalization.CultureInfo("zh-CN", true)); TimeSpan span = firstDateTemp.Subtract(secondDateTemp);然后，如果相差一天，那么span.Days=1，如果是一年，那么span.Days=365<br> span.Hours, span.Minutes就不举例了 |
2：第二种方式：
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DateTime t1 = DateTime.Parse("2007-1-1 05:32:22"); DateTime t2 = DateTime.Parse("2007-1-1 05:31:22"); TimeSpan span = t1.Subtract(t2); |
原文：http://www.cnblogs.com/bingzisky/p/3568867.html