[2005] Date Format - TROUBLE

In my for i have a bounded TextBox (txt_pana_la_data.Text).

I want to compare the txt_pana_la_data.Text with the curent date in the format "dd/MM/yyyy".

I have tryed with this code but is not working if i have for example the txt_pana_la_data.Text = 25/10/2007... what's wrong ?

Code:

---

    Private Sub txt_pana_la_data_TextChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles txt_pana_la_data.TextChanged

        'Dim data_curenta = Date.Now

        Dim data_expirarii As Date
        Dim data_curenta As Date
        data_curenta = Today
        Format(data_curenta, "dd/MM/yyyy")

        data_expirarii = Me.txt_pana_la_data.Text
        Format(data_expirarii, "dd/MM/yyyy")

        If data_expirarii < data_curenta Then

            Me.txt_stare_permis.Text = "Expirat"
            Me.btn_prelungire.Enabled = True

            Me.Validate()
            Me.permis_BindingSource.EndEdit()
            Me.permis_TableAdapter.Update(Me.permis_DataSet.lista_abonati)

            Me.permis_BindingSource.Clear()
            Me.permis_TableAdapter.Fill(Me.permis_DataSet.lista_abonati)

         
        Else

            'Me.txt_stare_permis.Text = "Activ"

        End If

    End Sub

---

Is there a reason that you chose to use a TextBox instead of the DateTimePicker, which is designed for dates?

If you do want to stick with a TextBox then you can't use the '<' operator on strings because it will compare them alphabetically. If you want to compare dates then you have to compare Date objects:

vb.net Code:

Dim input As Date
 
If Date.TryParseExact(Me.TextBox1.Text, _
                      "dd/MM/yyyy", _
                      Nothing, _
                      Globalization.DateTimeStyles.None, _
                      input) Then
    If input < Date.Today Then
        'The specified date is before today's date.
    End If
Else
    'Invalid input.
End If

Note also that if you specify "dd/MM/yyyy" as the format the the user will have to include leading zeroes on single-digit days. It might be more appropriate to use "d/MM/yyyy", which will accept single- or double-digit days.

The TextBox is ReadOnly... user does not type a date.

My computer date is 25.01.2008 and i have into the txt_pana_la_data.text the value 10/12/2007 and it's not working! Why ?!?!

This code i've used!

Code:

---

        Dim input As Date

        If Date.TryParseExact(Me.txt_pana_la_data.Text, "dd/MM/yyyy", Nothing, Globalization.DateTimeStyles.None, input) Then

            If input < Date.Today Then

                Me.txt_stare_permis.Text = "Expirat"
                Me.btn_prelungire.Enabled = True

                Me.Validate()
                Me.permis_BindingSource.EndEdit()
                Me.permis_TableAdapter.Update(Me.permis_DataSet.lista_abonati)

                Me.permis_BindingSource.Clear()
                Me.permis_TableAdapter.Fill(Me.permis_DataSet.lista_abonati)

            End If

        Else

            'Invalid input.

        End If

---

If your TextBox is ReadOnly then why do you need to test the value in the TextBox at all? That value must have come from somewhere, and that somewhere is presumably a Date value. You should be testing THAT value against the current Date.

The value comes from the database there where is stored as Text. I have more textboxes and a DGV that are bounded to a BindingSource. I have to display it (thru BindingSource - It's OK with this), read it and if it's smaller than the current date to display into another TextBox the value = "Expirat" (expired). (that's the point that i don't pass forward).

I have used your code but seems that is not working! Why... what i am doing wrong ????

I read a text value from database, i transform it to a date.today... (dd/MM/yyyy) and i compare it with the current date transformed to dd/MM/yyyy too.

Why are you reading a text value from the database? If it's a date then why is it not stored as a date? Do you store numbers as text or as numbers? If you store numbers as numbers then why don't you store dates as dates?

Also, my code does what it's supposed to do. How would I know what you're doing wrong if you haven't shown me what you are doing?

http://www.mbm-hosting.com/sample_screen.png

Code:

---

    Private Sub frm_gestionare_permise_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        'TODO: This line of code loads data into the 'Permis_DataSet.lista_abonati' table. You can move, or remove it, as needed.
        Me.permis_TableAdapter.Fill(Me.permis_DataSet.lista_abonati)

    End Sub

    Private Sub txt_pana_la_data_TextChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles txt_pana_la_data.TextChanged

        Dim input As Date

        If Date.TryParseExact(Me.txt_pana_la_data.Text, "dd/MM/yyyy", Nothing, Globalization.DateTimeStyles.None, input) Then

            If input < Date.Today Then

                Me.txt_stare_permis.Text = "Expirat"
                Me.btn_prelungire.Enabled = True

                Me.Validate()
                Me.permis_BindingSource.EndEdit()
                Me.permis_TableAdapter.Update(Me.permis_DataSet.lista_abonati)

                Me.permis_BindingSource.Clear()
                Me.permis_TableAdapter.Fill(Me.permis_DataSet.lista_abonati)

            End If

        Else

            'Invalid input.

        End If

    End Sub

---

Your txt_pana_la_data TextBox is bound to a column from your DataTable. That columns should contain Date values and you should be comparing that data to the current date. You should not be parsing the string in the TextBox and your DataColumn should not contain strings.