Text on Textmode Time property in .NET 4.5 can not set value in Code Behind

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ASP.NET

I have this on aspx side:

<asp:TextBox runat="server" ID="txtBoxStartTime" TextMode="Time">
C# code behind

protected void Page_Load(object sender, EventArgs e)
{
txtBoxStartTime.Text = project.ActivationDate.ToString("hh:mm tt");
}

Still does not show in TextBox on UI.

I've noticed the problem is the same with all of the Textmode Time Property on Framework 4.5

Any suggestions/solutions on this? I truly appreciate your input!

Thanks!