C# 中如何检查日期是否已过？

发布于 2024-12-11 07:46:30 字数 373 浏览 0 评论 0原文

我正在从数据库读取 cookie 过期日期（2 小时），并且我需要检查该日期是否已过。最好的方法是什么？

例如：

public bool HasExpired(DateTime now)
{
    string expires = ReadDateFromDataBase(); // output example: 21/10/2011 21:31:00
    DateTime Expires = DateTime.Parse(expires);
    return HasPassed2hoursFrom(now, Expires);
}

我正在寻找编写 .HasPassed2hoursFrom 方法的想法。

原文

I'm reading the date expires cookie (2 hours) from database, and I need to check if this date has passed. What's the best way to do this?

For example:

public bool HasExpired(DateTime now)
{
    string expires = ReadDateFromDataBase(); // output example: 21/10/2011 21:31:00
    DateTime Expires = DateTime.Parse(expires);
    return HasPassed2hoursFrom(now, Expires);
}

I'm looking for ideas as write the .HasPassed2hoursFrom method.

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羁拥 2024-12-18 07:46:30

public bool HasPassed2hoursFrom(DateTime fromDate, DateTime expireDate) 
{
    return expireDate - fromDate > TimeSpan.FromHours(2);
}

public bool HasPassed2hoursFrom(DateTime fromDate, DateTime expireDate) 
{
    return expireDate - fromDate > TimeSpan.FromHours(2);
}

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时光沙漏 2024-12-18 07:46:30

bool HasPassed2hoursFrom(DateTime now, DateTime expires)
{
    return (now - expires).TotalHours >= 2;
}

bool HasPassed2hoursFrom(DateTime now, DateTime expires)
{
    return (now - expires).TotalHours >= 2;
}

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泪之魂 2024-12-18 07:46:30

定期检查日期并查看是否 now.CompareTo(expires) > 0

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〗斷ホ乔殘χμё〖 2024-12-18 07:46:30

public bool HasExpired(DateTime now)
{
    string expires = ReadDateFromDataBase(); // output example: 21/10/2011 21:31:00
    DateTime Expires = DateTime.Parse(expires);
    return now.CompareTo(Expires.Add(new TimeSpan(2, 0, 0))) > 0;
}

但由于 DateTime.Now 非常快，您不需要将其作为函数参数传递...

public bool HasExpired()
{
    string expires = ReadDateFromDataBase(); // output example: 21/10/2011 21:31:00
    DateTime Expires = DateTime.Parse(expires);
    return DateTime.Now.CompareTo(Expires.Add(new TimeSpan(2, 0, 0))) > 0;
}

public bool HasExpired(DateTime now)
{
    string expires = ReadDateFromDataBase(); // output example: 21/10/2011 21:31:00
    DateTime Expires = DateTime.Parse(expires);
    return now.CompareTo(Expires.Add(new TimeSpan(2, 0, 0))) > 0;
}

But since DateTime.Now is very fast and you don't need to pass it as function parameter...

public bool HasExpired()
{
    string expires = ReadDateFromDataBase(); // output example: 21/10/2011 21:31:00
    DateTime Expires = DateTime.Parse(expires);
    return DateTime.Now.CompareTo(Expires.Add(new TimeSpan(2, 0, 0))) > 0;
}

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十二 2024-12-18 07:46:30

您可以只使用运算符

boolean hasExpired = now >= Expires;

You can just use operators

boolean hasExpired = now >= Expires;

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过气美图社 2024-12-18 07:46:30

private enum DateComparisonResult
    {
        Earlier = -1,
        Later = 1,
        TheSame = 0
    };

    void comapre()
    {
        DateTime Date1 = new DateTime(2020,10,1);
        DateTime Date2 = new DateTime(2010,10,1);

        DateComparisonResult comparison;
        comparison = (DateComparisonResult)Date1.CompareTo(Date2);
        MessageBox.Show(comparison.ToString());    
    }
    //Output is "later", means date1 is later than date2

检查日期是否已过：

来源：https://msdn.microsoft.com/en-us/library/5ata5aya%28v=vs.110%29.aspx?f=255&MSPPError=-2147217396

private enum DateComparisonResult
    {
        Earlier = -1,
        Later = 1,
        TheSame = 0
    };

    void comapre()
    {
        DateTime Date1 = new DateTime(2020,10,1);
        DateTime Date2 = new DateTime(2010,10,1);

        DateComparisonResult comparison;
        comparison = (DateComparisonResult)Date1.CompareTo(Date2);
        MessageBox.Show(comparison.ToString());    
    }
    //Output is "later", means date1 is later than date2

To check if date has passed:

Source:https://msdn.microsoft.com/en-us/library/5ata5aya%28v=vs.110%29.aspx?f=255&MSPPError=-2147217396

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