c# - C#: How to compare two dates

Question

I want to compare a date stored in a table in the form DD/MM/YYYY with the current date.

I need to know if it is earlier or later than DateTime.Now ...

Does someone have an idea to suggest?

Thank you in advance.

Answer 1

您可以DateTime.Compare为此使用：

var result = DateTime.Compare(Convert.ToDateTime(TextBox1.Text), DateTime.Today);
string relationship;

if (result < 0)
   relationship = "is earlier than";
else if (result == 0)
   relationship = "is the same time as";         
else
   relationship = "is later than";

Console.WriteLine("{0} {1} {2}", date1, relationship, date2);

有关详细信息，请参阅 MSDN 上的文档。

Answer 2

您可以使用以下代码将时间戳解析为 DateTime 对象，然后根据需要进行比较。

DateTime date;
DateTime.TryParseExact("12/03/2009", "dd/MM/yyyy", null, DateTimeStyles.None, out date);

在此处查看更多信息http://msdn.microsoft.com/en-us/library/8kb3ddd4.aspx

Answer 3

这可以通过DateTime.Compare方法来完成，如下所示：

date1 = Convert.ToDateTime(TextBox1.Text)
date2 = DateTime.Today
var result = DateTime.Compare(date1, date2)
string relationship

if (result < 0)
   relationship = "is earlier than";
else if (result == 0)
   relationship = "is the same time as";         
else
   relationship = "is later than";

Console.WriteLine("{0} {1} {2}", date1, relationship, date2);