时间计算

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System.DateTime date1 = new System.DateTime(1996, 12, 5, 13, 2, 0);
System.DateTime date2 = new System.DateTime(1996, 12, 5, 16, 2, 0);
System.DateTime date3 = new System.DateTime(1996, 10, 12, 8, 42, 0);

// diff1 gets 185 days, 14 hours, and 47 minutes.
System.TimeSpan diff1 = date2.Subtract(date1);

// date4 gets 4/9/1996 5:55:00 PM.
System.DateTime date4 = date3.Subtract(diff1);

// diff2 gets 55 days 4 hours and 20 minutes.
System.TimeSpan diff2 = date2 - date3;

// date5 gets 4/9/1996 5:55:00 PM.
System.DateTime date5 = date1 - diff2;

时间计算

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原文地址：http://www.cnblogs.com/newcoder/p/4998838.html