CompareValidator to compare Input DateTime with Current DateTime using C# and VB.Net in ASP.Net

Hi marouane,

Use below code.

HTML

<input id="txtDateTime" runat="server" type="text" placeholder="Start trip" required="" value="2000/11/11 22:34" />
<asp:Button ID="Button1" Text="Submit" OnClick="Button_Click" runat="server" />
<br />
<asp:CompareValidator ID="CompareValidator1" runat="server" ErrorMessage="The date time must be greater than current date time" ForeColor="Red"
    ControlToValidate="txtDateTime" Operator="GreaterThan" Type="String" Display="Dynamic" />

Code

C#

protected void Page_Load(object sender, EventArgs e)
{
    CompareValidator1.ValueToCompare = DateTime.Now.ToString("yyyy/MM/dd HH:mm").Replace("-","/");
}

protected void Button_Click(object sender, EventArgs e)
{

}

VB.Net

Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs)
    CompareValidator1.ValueToCompare = DateTime.Now.ToString("yyyy/MM/dd HH:mm").Replace("-", "/")
End Sub

Protected Sub Button_Click(ByVal sender As Object, ByVal e As EventArgs)
End Sub

Screenshot