DateTimePicker and MaxDate property

[LianaT]

Hi!

I use a DateTimePicker control to display the time. MaxDate is set for example to 2:10 and the control's Value is 1:55. If I select the hour in control and use up-arrow to increase the hour, the control's value is changed to 2:10, which is MaxDate value. But if Value is 1:55 and I try to type 2 instead of 1, the Value is not changed. I'd like to set control's Value to its MaxDate value in this situation too. Could you give me a suggestion how to do this, please?

Mihaela

 

[chmohan]

Does it have keypress event or keydown? IN case it has when you type 2 detect it using that event and set the value to maxdate

 

[LianaT]

I tried to catch KeyPress, KeyUp, KeyDown events, but the Value property was not the one I typed, but the old value(1:55 in my example). I think that the control catches the event before me and doesn't allow the change. ValueChanged event occurs only when I use the up-arrow to change the hour.

 

[earthandfire]

I can't help you in C#, however this VB.Net code seems to do what you need

 Private Sub ValidateTime()

    'make a copy of the default max date/time for later
    Dim maxval As DateTime = DateTimePicker1.MaxDateTime

    'set a temporary max date/time to allow us to process data
    Dim maxdate As String = "31/12/9997"
    Dim targetmax As DateTime = CDate(maxdate + " 2:10")
    DateTimePicker1.MaxDate = CDate(maxdate + " 23:59")

    'process the data
    Dim s As String = DateTimePicker1.Text
    If CDate(maxdate + " " + s) > targetmax Then
      DateTimePicker1.Value = targetmax
    End If

    'restore the original max date/time
    DateTimePicker1.MaxDate = maxval

  End Sub

  Private Sub DateTimePicker1_KeyDown(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles DateTimePicker1.KeyDown

    ValidateTime()

  End Sub

  Private Sub DateTimePicker1_LostFocus(ByVal sender As Object, ByVal e As System.EventArgs) Handles DateTimePicker1.LostFocus

    ValidateTime()

  End Sub

For some reason I've found that using either LostFocus or KeyDown doesn't always work, but using them both seems to.

By the way, 31/12/9997 is the maximum date that allows for a time of 23:59


Hope this helps.