date of birth regular expression validation for dd/mm/yyyy format issue

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HI all,

i am using textbox with calander extender and regular expression validation.

i have set calender date format to dd/MM/yyyy. now when i get this date on c# side and convert that to datetime i am getting error string is not valid as datetime.

here is my code.

ASP.NET

<asp:TextBox ID="txtbirthdate" runat="server" CssClass="field" Style="width: 290px;
                                        outline: none; padding-left: 10px; height: 25px;" MaxLength="10"></asp:TextBox>
                                    <asp:CalendarExtender OnClientShown="onCalendarShown" ID="txtbirthdate_CalendarExtender"
                                        runat="server" Enabled="True" TargetControlID="txtbirthdate" Format="dd/MM/yyyy">
                                    </asp:CalendarExtender>
                                    <script type="text/javascript" language="javascript">
                                        function onCalendarShown(sender, args) {
                                            sender._switchMode("years", true);
                                        }
                                    </script>
                                    <asp:RequiredFieldValidator Display="Dynamic" ID="rvbirthdate" Text="*" ToolTip="Please Enter Birthdate"
                                        runat="server" ForeColor="Red" Font-Bold="true" ErrorMessage="" ValidationGroup="loan"
                                        ControlToValidate="txtbirthdate"></asp:RequiredFieldValidator>
                                 
                                        <asp:RegularExpressionValidator ID="birthdatecheck" runat="server" ValidationGroup="loan"

             ErrorMessage="*" Tooltip="Please enter date in dd/mm/yyyy format" Display="Dynamic" ForeColor="Red" Font-Bold="true"   ControlToValidate="txtbirthdate"


            ValidationExpression="(0[1-9]|[12][0-9]|3[01])/(0[1-9]|1[012])/\d{4}"></asp:RegularExpressionValidator> 
                                    <asp:TextBoxWatermarkExtender ID="txtbirthdate_TextBoxWatermarkExtender" runat="server"
                                        Enabled="True" WatermarkText="Date of Birth: *" TargetControlID="txtbirthdate">
                                    </asp:TextBoxWatermarkExtender>

and my c# code is

C#

objLoanApp.birthdate = Convert.ToDateTime(txtbirthdate.Text);

Posted 20-Feb-14 17:27pm

ravikhoda

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Comments

Sergey Alexandrovich Kryukov 20-Feb-14 23:30pm

What is "calender"?!

Now, why Regex? If you do validation of server side, System.DateTime does it all.

—SA

phil.o 7-Mar-15 7:56am

Regular expressions are not meant to validate datetimes; at all. Why? Because datetimes are not only a collection of digits and symbols, there are some rules that cannot be enforced in regular expressions (leap years, the number of days in a given month, etc...). As it was told to you, System.DateTime already has required methods to do this validation.

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Sergey Alexandrovich Kryukov · Answer 1 · 2014-02-20T17:35:00

Please see my comment to the question.

You just need to learn System.DateTime and methods of parsing of string into date data. Please see all the methods named Parse, ParseExact, TryParse and TryParseExact (and avoid using Convert, in most cases; after all, this is parsing, not "conversion"):
http://msdn.microsoft.com/en-us/library/system.datetime%28v=vs.110%29.aspx[^].

These methods allow you do parse time from string in different formats, depending on format string or current or explicitly set culture. You also need to learn how to use format strings:
http://msdn.microsoft.com/en-us/library/az4se3k1(v=vs.110).aspx[^],
http://msdn.microsoft.com/en-us/library/8kb3ddd4(v=vs.110).aspx[^].

—SA

Bernhard Hiller · Answer 2 · 2014-02-20T21:37:00

That happens because IIS is running with a different locale which uses a different DateTime format.
You must tell the parser which format to use. E.g.

C#

System.Globalization.DateTimeFormatInfo dtf = new System.Globalization.DateTimeFormatInfo();
dtf.ShortDatePattern = "dd/MM/yyyy";
string input = "20/11/1975";
DateTime result = DateTime.Parse(input, dtf);

AnoopkumarS · Answer 3 · 2015-03-06T23:09:00

Solution 3

objLoanApp.birthdate = DateTime.ParseExact(txtbirthdate.Text,"dd/MM/yyyy",null)

Posted 6-Mar-15 23:09pm

AnoopkumarS

date of birth regular expression validation for dd/mm/yyyy format issue

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