Copare input date with date.now system

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i whant to compare date.now with date insert by client
using control validation in asp.net

What I have tried:

     <input id="input_date_travel_strat" runat="server" class="form-control form-control-sm" type="text" placeholder="Start trip" required=""/>            <asp:comparevalidator runat="server"   errormessage="The date must be greater than today"  controltovalidate="<%# Convert.ToDateTime(input_date_travel_strat)%>" Operator="GreaterThan" type="date"   valuetocompare="<%# DateTime.Today.ToShortDateString() %>" />

how can I compare date.now with date insert in input by client

Posted 11-May-20 14:59pm

Member 14626494

Updated 11-May-20 22:11pm

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Richard MacCutchan 12-May-20 4:07am

You are trying to compare a DateTime with a string. Use DateTime types for both values.

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Maciej Los · Answer 1 · 2020-05-11T22:11:00

Solution 1

Here is an example: Compare dates in dd/mm/yyyy format using ASP.Net CompareValidator[^]

Posted 11-May-20 22:11pm

Maciej Los

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Member 14626494 12-May-20 7:25am

thanks for replay but I said date.now of the system

Member 14626494 12-May-20 7:31am

<asp:button id="Button1" text="Submit" onclick="Button_Click" runat="server">

<asp:comparevalidator id="CompareValidator1" runat="server" errormessage="The date must be greater than today" forecolor="Red"
="" controltovalidate="input_date_travel_strat" operator="GreaterThan" type="Date" display="Dynamic">

------------behind code-------------

protected void Page_Load(object sender, EventArgs e)
{
CompareValidator1.ValueToCompare = DateTime.Today.ToShortDateString();
}

Maciej Los 12-May-20 7:49am

You haven't read referenced article. There's one very important statement: "By default the ASP.Net CompareValidator does not work for dd/mm/yyyy format hence we will need to change the Culture property of the page to en-GB in the @Pagedirective of the ASP.Net Web Page"
You have to know that ToShortDateString() returns string in format which is depend on operating system regional settings.
Test this to see the difference:

CultureInfo ci = new CultureInfo("Pl-pl");
Thread.CurrentThread.CurrentCulture = ci;
string formatteddate = DateTime.Today.ToShortDateString();
Console.WriteLine(formatteddate);

ci = new CultureInfo("en-US");
Thread.CurrentThread.CurrentCulture = ci;
formatteddate = DateTime.Today.ToShortDateString();
Console.WriteLine(formatteddate);

Result:
2020-05-12
5/12/2020