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VB.NET Calculate Date Difference

Posted on 2008-10-10
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Last Modified: 2012-05-05
I know there must be an easier way to calculate difference between dates or if one date is less than another.  Problem is I am trying to calculate a date in at text box against Date.Now.

This does not work.  
If CDate(Me.TextBox1.Text) < Date.Now Then
  MessageBox.Show("Date is less than" & Date.Now, "Date", MessageBoxButtons.OK, MessageBoxIcon.Information)
End If

This also does not work.  
Dim strDateDiff As String = DateDiff(DateInterval.Day.ToString(), Me.TextBox1.Text, Date.Now)

Any ideas?
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Question by:CipherIS
9 Comments
 
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Expert Comment

by:Wayne Taylor (webtubbs)
ID: 22686457
Hi CipherIS,

Use the DateTime.Compare method -> http://msdn.microsoft.com/en-us/library/system.datetime.compare(VS.80).aspx

        If Date.Compare(CDate(Me.TextBox1.Text), Date.Now) < 0 Then
            MessageBox.Show("Date is less than" & Date.Now, "Date", MessageBoxButtons.OK, MessageBoxIcon.Information)
        End If

Regards,

Wayne
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Expert Comment

by:Wayne Taylor (webtubbs)
ID: 22686474
I'd also be interested to know what you mean by "does not work". Is it producing any errors, or does it return unexpected results?

Wayne
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Author Comment

by:CipherIS
ID: 22686508
It does not compare correctly so it always displays the message box.
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LVL 8

Expert Comment

by:tiagosalgado
ID: 22686546
Try to watch your date values and check if they are in same format. Maybe there is your problem.
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Author Comment

by:CipherIS
ID: 22686562
Still does not worked.  Attached file.
Date.JPG
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Expert Comment

by:Wayne Taylor (webtubbs)
ID: 22686583
CipherIS,

If the textbox has todays date in it, it will always be less than Date.Now, because it also takes the time into account.

Wayne
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LVL 48

Accepted Solution

by:
jpaulino earned 500 total points
ID: 22686680
Try this method substracting the dates:
        Dim dt As New DateTime
 
        ' checks if it's a valid date
        If DateTime.TryParse(Me.TextBox1.Text, dt) Then
 
            ' Get's the number of days
            Dim days As Integer = dt.Subtract(Now.Date).TotalDays
 
            ' Writes the result
            Select Case days
                Case 0
                    Debug.WriteLine("TextBox1 = Now")
                Case Is > 0
                    Debug.WriteLine(String.Format("TextBox1 > Now in {0} days", days.ToString))
                Case Is < 0
                    Debug.WriteLine(String.Format("TextBox1 < Now in {0} days", days.ToString))
            End Select
 
        End If

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Author Closing Comment

by:CipherIS
ID: 31504992
Works as expected
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Expert Comment

by:Wayne Taylor (webtubbs)
ID: 22686812
CipherIS,

I'm curious why you selected jpaulino's suggestion over mine? I mentioned the reason why it was saying it was less than Date.Now at http:#a22686583

Wayne
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