c＃，比较日期

Question

我想用当前日期以DD/MM/YYYY形式将表格中的日期保存在表格中。 我需要知道它是否早于或晚于DateTime.Now ...

有人有想法建议吗？

预先感谢您。

Answer 1

您可以使用DateTime.Compare此：

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); 

参阅MSDN上的documentation了解更多详情。

Answer 2

这可以用DateTime.Compare方法来完成这样：

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); 

Answer 3

您可以使用下面的代码来解析您的时间戳为datetime对象，然后比较，只要你喜欢。

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

详见这里http://msdn.microsoft.com/en-us/library/8kb3ddd4.aspx