C＃如何检查当前是否为字符串的日期是今天？ [英] C# How would I check if a date that is currently a string is today?

问题描述

我有一个称为字符串（通用时间）格式的日期，请参见在此处链接了MSDN ，我需要检查此日期是否为今天，是否为X。

I have a date that is in a format called 'String(Generalized-Time)', see MSDN linked here , I need to check if this date is today and if it is do X.

为了使这个稍微复杂一点，在示例4中，我有一个int值，如果int是4，那么我想检查'String（Generalized-Time）'格式的日期是否为最近4天，即int也许是7、24、30等。

To complicate this slightly I have a int that is in this example 4, if the int is 4 then I want to check if the date that is in the 'String(Generalized-Time)' format is in the last 4 days, the int maybe 7, 24, 30 etc.

我该怎么写？我是新手，也非常感谢您的帮助。

How would I write this? I'm a novice and very grateful of the help.

谢谢

推荐答案

像这样：

   DateTime dt;
   if (DateTime.TryParse(stringValue, out dt) && 
       dt.Date == DateTime.Today)
   {
       // do some stuff
   }

要检查过去四天内是否有时间，

To check if it's anytime within the last four days,

   DateTime dt;
   if (DateTime.TryParse(stringValue, out dt) && 
       dt.Date > DateTime.Today.AddDays(-4f) &&
       dt < DateTime.Now)
   {
       // do some stuff
   }

或者，作为扩展方法

public static bool WithinPreviousPeriod(this DateTime dt, int daysBack)
{
     return dt.Date > DateTime.Today.AddDays(-daysBack))
             && dt < DateTime.Now;
}

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