字符串，日期时间，读取-写入-计算 [英] String, DateTime, Read - Write - Calculate

问题描述

将日期格式(如(05/03/2008 11:10:15 AM)以准确的格式"保存到文本文件.
从文本中读取它，然后将其作为日期时间值.
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如何找出哪个DateTime较大?

save a datetime like (05/03/2008 11:10:15 AM) "with the exact format" to a text file.
read it from the text then have it as a datetime value.
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how to find out which DateTime is bigger? how much bigger(e.g. date1 is 152 seconds bigger than date2)?

推荐答案

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要回答第一个问题:将运算符<，>，<=或>=与DateTime一起使用操作数它们都定义正确.

要回答第二个问题:使用运算符"-"(减法)，它返回类型为System.TimeSpan的值.

请参阅:
http://msdn.microsoft.com/en-us/library/system.datetime.aspx [ ^ ]，
http://msdn.microsoft.com/en-us/library/system.timespan.aspx [ ^ ].

—SA

To answer first question: use the operators <, >, <= or >= with DateTime operands; they are all defined properly.

To answer the second question: use the operator ''-'' (subtraction), it returns the value of the type System.TimeSpan.

Please see:
http://msdn.microsoft.com/en-us/library/system.datetime.aspx[^],
http://msdn.microsoft.com/en-us/library/system.timespan.aspx[^].

—SA

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