Sending an input value from a view to a controller in MVC

I've got a textbox on a view

@Html.EditorFor(model => model.StartDate, new { htmlAttributes = new { @class = "form-control" } })

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and I'm submitting data via my controller using

  public ActionResult Create([Bind(Include = "ID,StartDate,EndDate,Approval,Status,Type,Hours,Comments,FiscalYear,EMPLID,FiscalWeek,EarningsCode,ApprovalComments,ApprovedBy,ApprovedDate")] PTO_REQUEST pTO_REQUEST)
        {
            if (ModelState.IsValid)
            {
                pTO_REQUEST.Approval = false;
                pTO_REQUEST.Status = "Pending";
                pTO_REQUEST.FiscalYear = Fiscal.getFY(DateTime.Now);
                pTO_REQUEST.EMPLID = Helpers.User.GetEmployeeID();
                db.PTO_REQUEST.Add(pTO_REQUEST);
                db.SaveChanges();
                return RedirectToAction("Index");
            }

            return View(pTO_REQUEST);
        }

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I want to replace the DateTime.Now in

pTO_REQUEST.FiscalYear = Fiscal.getFY(DateTime.Now);

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With the value of the aforementioned textbox above. How do I do that?