date and time validation

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hi , is there any possibility to validate date and time with two date time pickers in vb.net coding

EDIT

VB

Dim date1 As Date = Me.DateTimePicker2.Value
        Dim date2 As Date = Me.DateTimePicker3.Value

        If (Me.DateTimePicker3.Value <= Me.DateTimePicker2.Value) Then
            TextBox9.Text = "ON-TIME"
        ElseIf (Me.DateTimePicker3.Value > Me.DateTimePicker2.Value) Then
            TextBox9.Text = "DELAY"
        End If

here i validate the date and display the status in the textbox now by setting the datetimepicker customformat to "MMM dd, yyyy hh:mm:ss tt " i need to validate the time also....

Posted 28-Nov-11 18:33pm

ANANTH P

Updated 28-Nov-11 19:53pm

thatraja

v2

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Sergey Alexandrovich Kryukov 29-Nov-11 0:36am

Can you give an example of the invalid? How can it appear?
--SA

ANANTH P 29-Nov-11 0:44am

Dim date1 As Date = Me.DateTimePicker2.Value
Dim date2 As Date = Me.DateTimePicker3.Value

If (Me.DateTimePicker3.Value <= Me.DateTimePicker2.Value) Then
TextBox9.Text = "ON-TIME"
ElseIf (Me.DateTimePicker3.Value > Me.DateTimePicker2.Value) Then
TextBox9.Text = "DELAY"
End If

here i validate the date and display the status in the textbox now by setting the datetimepicker customformat to "MMM dd, yyyy hh:mm:ss tt " i need to validate the time also....

Sergey Alexandrovich Kryukov 29-Nov-11 0:59am

OK, this is the way, so what's the problem. Perhaps, this: there is not such thing as date vs. time. There is only on thing: time. A data is nothing more that a position of the time point on the calendar. In your code above, you compare time. A time is a unique point on time scale, and this is what described by the structure DateTime. If your problem is different, please explain.
--SA

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Sergey Alexandrovich Kryukov · Answer 1 · 2011-11-28T18:36:00

The time entered with a date-time picker is always valid. There is nothing to validate.

[EDIT]

Please also see the discussion in comments to the question above. I try to explain the meaning of DateTime. This is not date + time, this is actually time, a unique point on the time line. Comparison of the values ('==', '!=', '<=', '>=', '>', '<') compares which events are simultaneous or which one follows which one; without data or time of the day concerns. This is what should be used for validation of time data.

—SA

**Manoj K Bhoir** · Answer 2 · 2011-11-28T19:04:00

Whatever code provided you above in that you are compairing two Date values with each other.For that you can use :

VB

Dim d1 As DateTime = New DateTime(Year, Month, Day, Hour, Minute, Second)
Dim d2 As DateTime = New DateTime(Year, Month, Day, Hour, Minute, Second)
MessageBox.Show(DateTime.Compare(d1, d2))

It return -1 if d1 is less than d2,1 if d1 is greater than d2 and 0 if both are equal.

date and time validation

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