fix a make reservation error

internal/handlers/handlers.go

@@ -145,9 +145,16 @@ func (m *Repository) PostMakeReservation(w http.ResponseWriter, r *http.Request)
 		data := make(map[string]interface{})
 		data["reservation"] = reservation
 
+		sd := reservation.StartDate.Format("2006-01-02")
+		ed := reservation.EndDate.Format("2006-01-02")
+		stringMap := make(map[string]string)
+		stringMap["start_date"] = sd
+		stringMap["end_date"] = ed
+
 		render.Template(w, r, "make-reservation.page.tmpl", &models.TemplateData{
 			Data:      data,
 			Form:      form,
+			StringMap: stringMap,
 		})
 		return
 	}