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ASP.NET: Check date input

Posted on 2008-10-07
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Last Modified: 2013-12-17
I am importing data from a excel file and I have to check the date format in one column. I use the code in the snippet but it does not work. How can I correct that?
//I want to check if the date is in format 'yyyymmdd'
DateTime entryD
CultureInfo cult = new CultureInfo("en-US");
DateTimeStyles stl = DateTimeStyles.AssumeLocal;
if (!DateTime.TryParse(row["EntryDate"].ToString(),cult, stl, out entryD)) //This always pass, even if the date is in ddmmyyyy format
{
//Do other processing here
}

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Question by:karakav
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6 Comments
 
LVL 5

Expert Comment

by:Didier Vally
ID: 22657240
You can use date validation in ASP.NET :

<asp:Label runat="server" AssociatedControlID="tbDate" Text="Date" /> <asp:TextBox ID="tbDate" runat="server" /> <asp:CompareValidator runat="server" ControlToValidate="tbDate" Text="*" ValidationGroup="MyValidationGroup" Operator="DataTypeCheck" Type="date" />

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LVL 6

Expert Comment

by:avnish_tanna
ID: 22657528
check if below link helps:
http://www.daniweb.com/forums/thread34168.html (see post #7)
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LVL 4

Author Comment

by:karakav
ID: 22657534
I won't use a compare validator to compare values in a file.?!?!?
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Expert Comment

by:Binuth
ID: 22657689
use DateTime.ParseExact
	try 
	{	        
		// it will throw expection if string format is not yyyyMMdd
		DateTime entryD = DateTime.ParseExact(row["EntryDate"].ToString(),"yyyyMMdd",null);	
	}
	catch (Exception)
	{
		
		throw;
	}

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LVL 4

Author Comment

by:karakav
ID: 22657887
I finally managed to do it this way:
//I want to check if the date is in format 'yyyymmdd'
DateTime entryD
CultureInfo cult = new CultureInfo("en-US");
DateTimeStyles stl = DateTimeStyles.None;
if (!DateTime.TryParseExact(row["EntryDate"].ToString(),"yyyyMMdd hh:mm:ss",cult, stl, out entryD)) //This always pass, even if the date is in ddmmyyyy format
{
//Do other processing here
}

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LVL 3

Accepted Solution

by:
trunghieubkit earned 2000 total points
ID: 22657944
Your result does not depend on the 2 lines

CultureInfo cult = new CultureInfo("en-US");
DateTimeStyles stl = DateTimeStyles.None;

"yyyyMMdd" is Japan culture,




DateTime entryD;
CultureInfo cult = CultureInfo.InvariantCulture;
DateTimeStyles stl = DateTimeStyles.AssumeLocal;
if (!DateTime.TryParseExact("20070122", "yyyyMMdd", cult, stl, out entryD))
{
    return;
}

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