Solved

VB.NET Calculate Date Difference

Posted on 2008-10-10
9
3,487 Views
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?
0
Comment
Question by:CipherIS
9 Comments
 
LVL 47

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
0
 
LVL 47

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
0
 
LVL 1

Author Comment

by:CipherIS
ID: 22686508
It does not compare correctly so it always displays the message box.
0
Free Tool: Path Explorer

An intuitive utility to help find the CSS path to UI elements on a webpage. These paths are used frequently in a variety of front-end development and QA automation tasks.

One of a set of tools we're offering as a way of saying thank you for being a part of the community.

 
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.
0
 
LVL 1

Author Comment

by:CipherIS
ID: 22686562
Still does not worked.  Attached file.
Date.JPG
0
 
LVL 47

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
0
 
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

Open in new window

0
 
LVL 1

Author Closing Comment

by:CipherIS
ID: 31504992
Works as expected
0
 
LVL 47

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
0

Featured Post

Free Tool: Port Scanner

Check which ports are open to the outside world. Helps make sure that your firewall rules are working as intended.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

This tutorial demonstrates one way to create an application that runs without any Forms but still has a GUI presence via an Icon in the System Tray. The magic lies in Inheriting from the ApplicationContext Class and passing that to Application.Ru…
If you need to start windows update installation remotely or as a scheduled task you will find this very helpful.
Although Jacob Bernoulli (1654-1705) has been credited as the creator of "Binomial Distribution Table", Gottfried Leibniz (1646-1716) did his dissertation on the subject in 1666; Leibniz you may recall is the co-inventor of "Calculus" and beat Isaac…
I've attached the XLSM Excel spreadsheet I used in the video and also text files containing the macros used below. https://filedb.experts-exchange.com/incoming/2017/03_w12/1151775/Permutations.txt https://filedb.experts-exchange.com/incoming/201…

809 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question