How to validate Date entries.

[YardDancer]

Hi All,

Does anybody have a routine for validating a date or DateTime entry in a
textbox.

I know i can use one of the DateTime.Parse( textbox.text) methods which
would throw a Fromat Exception.

What i am after is something like a IsNumeric() fuction or way i can test a
value if it is dateTime value and recieve a boolean answer i.e. true or
false.

Yard Dancer
Practicing at home before I attempt to dance at the hall.

[Ken Tucker [MVP]]

Re Dim dtnow As DateTime: How to validate Date entries.

Hi,

If you are using vb 2005 I would use DateTime.TryPar se otherwise
I would use a regex.

http://msdn2.microsoft.com/en-us/lib....tryparse.aspx

Dim dtnow As DateTime

If DateTime.TryPar se("1/1/2006", dtnow) Then
Me.Text = dtnow.ToString
End If

Regex example

Dim dtNow As DateTime
Dim strDate As String = "1/1/2006"
Dim regDate As New
System.Text.Reg ularExpressions .Regex("^\d{1,2 }\/\d{1,2}\/\d{4}$")
If regDate.IsMatch (strDate) Then
dtNow = Date.Parse(strD ate)
Me.Text = dtNow.ToString
End If

http://www.regexlib.com/Search.aspx?k=date

Ken
---------------------
"YardDancer " <dancer_yard@ho tmail.comwrote in message
news:OiLzXP9sGH A.1876@TK2MSFTN GP06.phx.gbl...

Hi All,
>
Does anybody have a routine for validating a date or DateTime entry in a
textbox.
>
I know i can use one of the DateTime.Parse( textbox.text) methods which
would throw a Fromat Exception.
>
What i am after is something like a IsNumeric() fuction or way i can test
a value if it is dateTime value and recieve a boolean answer i.e. true or
false.
>
Yard Dancer
Practicing at home before I attempt to dance at the hall.
>

[YardDancer]

Re: Re Dim dtnow As DateTime: How to validate Date entries.

I am Programming with VB.NET 2003

--
Yard Dancer
Practicing at home before I attempt to dance at the hall.
"Ken Tucker [MVP]" <vb2ae@bellsout h.netwrote in message
news:ux3w9g9sGH A.4612@TK2MSFTN GP06.phx.gbl...

Hi,
>
If you are using vb 2005 I would use DateTime.TryPar se
otherwise I would use a regex.
>
http://msdn2.microsoft.com/en-us/lib....tryparse.aspx
>
Dim dtnow As DateTime
>
If DateTime.TryPar se("1/1/2006", dtnow) Then
Me.Text = dtnow.ToString
End If
>
Regex example
>
Dim dtNow As DateTime
Dim strDate As String = "1/1/2006"
Dim regDate As New
System.Text.Reg ularExpressions .Regex("^\d{1,2 }\/\d{1,2}\/\d{4}$")
If regDate.IsMatch (strDate) Then
dtNow = Date.Parse(strD ate)
Me.Text = dtNow.ToString
End If
>

http://www.regexlib.com/Search.aspx?k=date

>
Ken
---------------------
"YardDancer " <dancer_yard@ho tmail.comwrote in message
news:OiLzXP9sGH A.1876@TK2MSFTN GP06.phx.gbl...

>Hi All,
>>
>Does anybody have a routine for validating a date or DateTime entry in a
>textbox.
>>
>I know i can use one of the DateTime.Parse( textbox.text) methods which
>would throw a Fromat Exception.
>>
>What i am after is something like a IsNumeric() fuction or way i can
>test a value if it is dateTime value and recieve a boolean answer i.e.
>true or false.
>>
>Yard Dancer
>Practicing at home before I attempt to dance at the hall.
>>

>
>

[Kerry Moorman]

RE: How to validate Date entries.

YardDancer,

What about VB's IsDate function?

Kerry Moorman

"YardDancer " wrote:

Hi All,
>
Does anybody have a routine for validating a date or DateTime entry in a
textbox.
>
I know i can use one of the DateTime.Parse( textbox.text) methods which
would throw a Fromat Exception.
>
What i am after is something like a IsNumeric() fuction or way i can test a
value if it is dateTime value and recieve a boolean answer i.e. true or
false.
>
Yard Dancer
Practicing at home before I attempt to dance at the hall.
>
>
>

[Rad Dec [C# MVP]]

Re: How to validate Date entries.

It's tricky to write such a validation routine because "invalid date" is
quite relative.

For instance "13/1/2006" is a valid in some regions but not in others.

If you know the region you can do this:

string UK="13/1/2006";
DateTime UKDate = DateTime.Parse( UK,new System.Globaliz ation.CultureIn fo("en-gb"));

You could probably put this in a function and catch any format exceptions
and return false.

Hi All,
>
Does anybody have a routine for validating a date or DateTime entry
in a textbox.
>
I know i can use one of the DateTime.Parse( textbox.text) methods
which would throw a Fromat Exception.
>
What i am after is something like a IsNumeric() fuction or way i can
test a value if it is dateTime value and recieve a boolean answer i.e.
true or false.
>
Yard Dancer
Practicing at home before I attempt to dance at the hall.

[YardDancer]

Re: How to validate Date entries.

Hi Kerry,

I want to write all my routines using methods and properties that are
consistent
with the .Net Framework class library. I am trying to avoid using
functions
from the VB run-time library.

--
Yard Dancer
Practicing at home before I attempt to dance at the hall.


Kerry Moorman" <KerryMoorman@d iscussions.micr osoft.comwrote in message
news:BFFACFA5-4EBF-49FA-8135-5599A1AE817C@mi crosoft.com...

YardDancer,
>
What about VB's IsDate function?
>
Kerry Moorman
>
"YardDancer " wrote:
>

>Hi All,
>>
>Does anybody have a routine for validating a date or DateTime entry in a
>textbox.
>>
>I know i can use one of the DateTime.Parse( textbox.text) methods which
>would throw a Fromat Exception.
>>
>What i am after is something like a IsNumeric() fuction or way i can
>test a
>value if it is dateTime value and recieve a boolean answer i.e. true or
>false.
>>
>Yard Dancer
>Practicing at home before I attempt to dance at the hall.
>>
>>
>>