int M_GetLastTradeDayDifference()
{
   datetime last_time = 0;

   HistorySelect(0, TimeCurrent());

   int deals = HistoryDealsTotal();
   int DaysDiff = -1;
   if(deals > 0)
   {
      for(int i = deals - 1; i >= 0; i--)
      {
         ulong ticket = HistoryDealGetTicket(i);
   
         if(ticket > 0)
         {
            long entry = HistoryDealGetInteger(ticket, DEAL_ENTRY);
            
            if(entry == DEAL_ENTRY_IN || entry == DEAL_ENTRY_OUT)// Nur echte Ein-/Ausstiege
            {
               datetime deal_time = HistoryDealGetInteger(ticket, DEAL_TIME);
   
               if(deal_time > last_time)
                  last_time = deal_time;
            }
         }
      }
      
      DaysDiff = (stGVL.dtCurrentTime - last_time) / 86400;
      M_LogInfo("Last trade is " + IntegerToString(DaysDiff) + " days ago");
   }
   else
   {
      M_LogWarning("No deals found in history!");
   }
   
   return DaysDiff;
}