如何查看今天的日期是否为结束日期的5天？ [英] How can I check if today's date is 5 days from ending date?

问题描述

我有一张包含3个日期的表格。注册日期，结束日期和实际日期。

我想要的只是向我展示一个文本框，它可以提醒我结束日期是在5天内和结束日期发生的。例如：



我的结束日期设置为4-5-17，实际日期为29-4-17。它应该做的是，当日期是结束后的-5天，它会向我显示警告，然后当结束日期等于今天的日期时，它将显示我设置为编辑日期的表格。 br />


我尝试过：



试图将日期转换为字符串当日期到达时，将-5减去结束日期并将消息框减去。

I have a table that includes 3 dates. The registered date, the ending date and the actual date.
What I want is to simply show me a textbox that could remind me that the end date is happening in 5 days and on the end date. For example:

I have a "end date" set to 4-5-17 and the "actual date" is 29-4-17. What it should do is that it would show me a warning when the date is -5 days from ending, and then when the end date is equal to today's date it will show me a form that i've set to edit the date.

What I have tried:

Tried to convert date to string and subtract -5 to the end date and messagebox me when the date is reaching.

string actualdate;
string enddate;
enddate = dr.Cells["Até"].Value.ToString();
actualdate = DateTime.Now.ToString();
if (actualdate > enddate)
{
    MesageBox.Show("The end date of "dr.Cells["Name"].Value" subscription is ending!","Warning");
}

推荐答案

引用：

尝试将日期转换为字符串并将-5减去结束日期，并在日期到达时将消息框减去。

Tried to convert date to string and subtract -5 to the end date and messagebox me when the date is reaching.

不要这样做！相反，将其保留为DateTime值：

Don't do that! Instead, keep it as a DateTime value:

private bool IsWithinDays(DateTime date, int numberOfDays)
    {
    return DateTime.Now.Date.AddDays(numberOfDays) >= date;
    }

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