比较时日期格式会改变吗？

Question

这是我的代码

if (cs1.moveToFirst()) {
                                    curr_date = cs1.getString(0);
                                    exp_date = cs1.getString(1);
                                    account_activation_status = cs1
                                            .getString(2);
                                    status_flag = cs1.getString(3);
                                    Log.e("dates", ">" + cs1.getString(0)
                                            + "   " + cs1.getString(1));
                                } else {
                                    Log.e("dates", "no table>" + cs1.getString(0)
                                            + "   " + cs1.getString(1));
                                }
                                try {
                                    Calendar c = Calendar.getInstance();
                                    SimpleDateFormat df = new SimpleDateFormat("dd-MM-yyyy");
                                    formattedDateTime = df.format(c.getTime());
                                    date1 = df.parse(curr_date);
                                    date2 = df.parse(exp_date);
                                    date3 = df.parse(formattedDateTime);
                                    Log.e("dates", "date1=" + date1
                                            + " date2=" + date2+" date3="+date3);
                                    boolean dateNew1=date3.getTime() < date2.getTime();

                                    if (date3.getTime() < date2.getTime()
                                            && (!status_flag.matches("D"))
                                            && (!account_activation_status
                                                    .matches("0"))) {
                                        Log.d("expiry", ">1="+status_flag+" 2="+account_activation_status+" 14="+dateNew1);
                                        Log.e("4", "4");
                                        button_yes.setEnabled(true);}
                          else{
                               none}

我面临的是即使我将日期转换为特定格式（即dd-MM-yyyy），在某些情况下我会得到（yyyy-MM-dd）。我的情况变得虚假......需要提前帮助