顯示其餘的日子

Question

我有一個asp.net系統在數據庫中有一個帶有日期時間值的PODate字段。如何減去交貨到貨前剩下的日子。我想在列表視圖中以列顯示

示例：交貨日期爲10月21日。它必須在交貨到達之前顯示14天。

它可以在選擇查詢中完成，或者它必須在我的visual studio中完成。

Answer 1

如果您正在使用SQL Server那麼你可以使用此查詢：

SELECT DATEDIFF(day,Column1,Column2) AS DiffDate from TableName 

或者，如果你想這樣做的c#那麼你可以使用TimeSpan對象

DateTime date1; 
DateTime date2; 
return (date1 - date2).TotalDays; 

如果您子查詢只返回一個值，然後您可以嘗試

SELECT ABS((SELECT DATEDIFF(day,Column1,Column2) AS DiffDate from TableName)) 

Answer 2

你可以用C＃

DateTime date1; 
DateTime date2; 
return (date1 - date2).Days; 

Answer 3

做到這可以幫助你找到的差異。

SELECT DATEDIFF(DAY, GETDATE(), deliveryDate) AS DayDiff 
SELECT DATEDIFF(MINUTE, GETDATE(), deliveryDate) AS MinuteDiff 
SELECT DATEDIFF(SECOND, GETDATE(), deliveryDate) AS SecondDiff 
SELECT DATEDIFF(WEEK, GETDATE(), deliveryDate) AS WeekDiff 
SELECT DATEDIFF(HOUR, GETDATE(), deliveryDate) AS HourDiff 

Answer 4

它可以同時在做，

我寧願它在Visual Studio中進行，因爲這是明顯地呈現 邏輯。

C＃

DateTime oldDate = new DateTime(2002,7,15); 
DateTime newDate = DateTime.Now; 

// Difference in days, hours, and minutes. 
TimeSpan ts = newDate - oldDate; 
// Difference in days. 
int differenceInDays = ts.Days; 

Console.WriteLine("Difference in days: {0} ", differenceInDays); 

https://msdn.microsoft.com/en-us/library/aa287590%28v=vs.71%29.aspx?f=255&MSPPError=-2147217396

VB

Dim firstDate, msg As String 
Dim secondDate As Date 
firstDate = InputBox("Enter a date") 
Try 
    secondDate = CDate(firstDate) 
    msg = "Days from today: " & DateDiff(DateInterval.Day, Now, secondDate) 
    MsgBox(msg) 
Catch 
    MsgBox("Not a valid date value.") 
End Try 

https://msdn.microsoft.com/en-us/library/b5xbyt6f(v=vs.90).aspx