System.datetime? To system.datetime

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C#

DateTime

system

I'm getting an error saying System.datetime? can't be converted to System.datetime, but an explicit conversion exists. I did a Google search and found a proposed solution... but I still get the error. OPT_EXP is a nullable column. Please take a look and show me what's wrong?

What I have tried:

       public class MC_VARIABLES
       {
           public DateTime? OPT_EXP;
           public DateTime? mOPT_EXP
           {
               get { return mOPT_EXP; }
               set { mOPT_EXP = value; }
           }
       }

public void DTE()
   {
       decimal DTE;

       foreach (KeyValuePair<int,> KVP in dctMC)
       {
           if (KVP.Value.OPT_EXP.HasValue)
           {
               DateTime TDY = DateTime.Now;
               DateTime EXP = KVP.Value.OPT_EXP;           //cannot implicitly convert system.datetime? to system.datetime....not sure how to fix this
               TimeSpan DaysToExp = TDY - EXP;
               DTE = (decimal)(DaysToExp.TotalDays) / 365;
           }
       }
   }