Validate that date must not be greater than todays date ?

Question

1.00/5 (1 vote)

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<asp:TextBox ID="txtStartDate" CssClass="Form_InputField" runat="server">

this is my text box .. how can i validate that value entered in this must not be greater than todays date ...

Posted 24-Sep-13 20:17pm

Torakami

Updated 14-Jun-21 22:43pm

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Comments

Thomas ktg 25-Sep-13 2:35am

You can validate it in several ways. How do you want to validate? Do you want to validate through javascript or serverside? And what have you tried with regarding validation of date?

Torakami 25-Sep-13 2:43am

I want to do that using some validator controls if possible

3 solutions

Solution 1

For System.DateTime, operator '<=' is defined, among others.
To get a value from a string, use one of the methods Parse, ParseExact, TryParse or TryParseExact depending on required format or culture. Please see:
http://msdn.microsoft.com/en-us/library/system.datetime.aspx[^].

However, using a text box to edit date/time is not really a good idea. It's much better to use some DateTimePicker. Please see my past answer: TextBox allow only (HH:mm tt) format using asp.net[^].

—SA

Posted 24-Sep-13 20:38pm

Sergey Alexandrovich Kryukov

Comments

Torakami 25-Sep-13 2:45am

Yes i have used date time picker only but its in jquery .. how can i check here i dont understand ..

$("#<%=txtStartDate.ClientID%>").datepicker({
showOn: 'both', showAnim: '', changeMonth: true,
changeYear: true, buttonImage: '../images/calendar.gif',
buttonImageOnly: true, dateFormat: 'dd/mm/yy'
});

Sergey Alexandrovich Kryukov 25-Sep-13 3:21am

What cannot you understand? if (time2 <= time1)... if (time2 >= time1)...
—SA

Solution 3

If u use calenderExtenderextender control.. enter your code like this at script tag...u cal this method in calenderextender control add this properity also...

XML

OnClientDateSelectionChanged="checkDate"

<pre lang="xml">&lt;script type=&quot;text/javascript&quot;&gt;

        function checkDate(sender, args) {
            if (sender._selectedDate &gt; new Date()) {
                alert(&quot;You cannot select a future date!&quot;);
                sender._selectedDate = new Date();
                // set the date back to the current date
                sender._textbox.set_Value(sender._selectedDate.format(sender._format))
            }
        }</pre>

Posted 24-Sep-13 23:00pm

Siva Hyderabad

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Thomas ktg · Accepted Answer · 2013-09-24T20:58:00

Refer these links to validate the date format.

http://stackoverflow.com/questions/3005425/how-to-check-or-validate-the-textbox-entered-date-is-in-dd-mm-yyyy-format[^]

after this add the below code to validate the date.

C#

DateTime currentdate = Convert.ToDateTime(DateTime.Now.ToString("dd/MM/yyyy"));
DateTime ToDate = DateTime.ParseExact(e.Value,"dd/MM/yyyy", CultureInfo.InvariantCulture);
    if (ToDate > currentdate)
                {
                    lblShowDateError.Visible = true;
                    lblShowDateError.Text = "End Date should not be earlier than the current date.";
                    return;
                }
                else
                {
                    lblShowDateError.Text = "";
                }