Date picker dialog date validation

Question

I would like to implement the following behaviour:

When today's date is less than 15, 1-15 date is enabled in date Picker
When today's date is greater than 15, 16-31 date is enabled in date picker

My code is:

private void DateDialog() {
    final DatePickerDialog dpDialog = new DatePickerDialog(this,android.app.AlertDialog.THEME_DEVICE_DEFAULT_DARK,new DatePickerDialog.OnDateSetListener() {
        @Override
        public void onDateSet(DatePicker datePicker, int i, int i1, int i2) {
            cal = Calendar.getInstance();
            cal.setTimeInMillis(System.currentTimeMillis());
            //int curyear = cal.get(Calendar.YEAR);
            cal.set(i, i1, i2);
            etsubmstartdate.setText(dateformatter.format(cal.getTime()));
            selecteddate = dateformatter.format(cal.getTime());
            Log.e("Date of first edit text",selecteddate);
            etsubmstartdate.setText(selecteddate);
        }
    }, year, month, day);
    if (System.currentTimeMillis()<=15)
    {
        dpDialog.getDatePicker().setMinDate(System.currentTimeMillis() - 1000);
        long now = System.currentTimeMillis() - 1000;
        dpDialog.getDatePicker().setMaxDate(now+(1000*60*60*24*15));
        dpDialog.show();
    }
    else if(System.currentTimeMillis()>=15)
    {
        dpDialog.getDatePicker().setMinDate(System.currentTimeMillis() - 1000*60*60*24*2);
        long now = System.currentTimeMillis() - 1000*60*60*24*2;
        dpDialog.getDatePicker().setMaxDate(now+(1000*60*60*24*14));
        dpDialog.show();
    }
}

Possible duplicate of [How to validate date picker?](https://stackoverflow.com/questions/49895071/how-to-validate-date-picker) — Ole V.V., Apr 18 '18 at 10:32
You mean rest of half of the month days will be disabled if the current date is 15. — Farhana Naaz Ansari, Apr 18 '18 at 10:35
first check your current date, If current date is less than 15 then set min and max date in date picker, It will automatically enable and disabel according to your min and max date. — Farhana Naaz Ansari, Apr 18 '18 at 10:38
@farhana You mean `dpDialog.getDatePicker.setMinDate()` and `.setMaxDate()`? That sounds viable. But this is already done in the code in the question!? So what are you suggesting?? — Ole V.V., Apr 18 '18 at 16:28

Janvi Vyas · Accepted Answer · 2018-04-19T12:22:12.920

You can use .before and .after methods of Date class.

For example,

if (currentDate.before(yourdate)) {

//write your code require to before current date
}

if (currentDate.after(yourdate)) {

//write your code require to after current date
}

As per your code please replace below code in DateDialog() method

private void DateDialog() {

 final DatePickerDialog.OnDateSetListener date = new DatePickerDialog.OnDateSetListener() {

                    @Override
                    public void onDateSet(DatePicker view, int year, int monthOfYear,
                                          int dayOfMonth) {
                        // TODO Auto-generated method stub
                        myCalendar.set(Calendar.YEAR, year);
                        myCalendar.set(Calendar.MONTH, monthOfYear);
                        myCalendar.set(Calendar.DAY_OF_MONTH, dayOfMonth);
                        updateLabel();
                    }

                };

                DatePickerDialog dpDialog = new DatePickerDialog(MainActivity.this, date, myCalendar
                        .get(Calendar.YEAR), myCalendar.get(Calendar.MONTH),
                        myCalendar.get(Calendar.DAY_OF_MONTH));

                Toast.makeText(MainActivity.this, "date::"+myCalendar.getTimeInMillis(), Toast.LENGTH_SHORT).show();

                String dt = "2018-04-15";
                String dtSixteen = "2018-04-16";

                SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd", Locale.US);
                try {
                    Date dateFifteen = format.parse(dt);
                    Calendar calFifteen = Calendar.getInstance();
                    calFifteen.setTime(dateFifteen);

                    Date dateSixteen = format.parse(dtSixteen);
                    Calendar calSixteen = Calendar.getInstance();
                    calSixteen.setTime(dateSixteen);


                    Date currentDate = myCalendar.getTime();
                    Calendar calendar = Calendar.getInstance();

                    calendar.setTime( myCalendar.getTime() );
                    calendar.set(Calendar.HOUR_OF_DAY, 0);
                    calendar.set(Calendar.MINUTE, 0);
                    calendar.set(Calendar.SECOND, 0);
                    calendar.set(Calendar.MILLISECOND, 0);

                    currentDate = calendar.getTime();


                    if(currentDate.before(dateFifteen) || currentDate.equals(dateFifteen)){
                        dpDialog.getDatePicker().setMaxDate(calFifteen.getTimeInMillis());
                    }else {
                         dpDialog.getDatePicker().setMinDate(calSixteen.getTimeInMillis());
                    }

                } catch (ParseException e) {
                    e.printStackTrace();
                }

                dpDialog.show();

}

it's not working for me before and after is not visible in my suggestion menu — RAJ KUMAR, Apr 18 '18 at 12:03
what is your suggestion menu? and **before and after** are methods of **Date class ** as i mentioned above — Janvi Vyas, Apr 18 '18 at 12:05
hi @RAJKUMAR I have edited new code as per your requirement pleas try it and let me know if any query. — Janvi Vyas, Apr 19 '18 at 12:23
mam you take static date in your above code but i want this operation on every month — RAJ KUMAR, Apr 20 '18 at 04:32
yeah @Raj kumar. you can change as per your requirement its just demo for you and after added this code you can apply your logic for every month. but after and before method its work properly Right? — Janvi Vyas, Apr 20 '18 at 04:54

score 0 · Answer 2 · answered Apr 18 '18 at 17:03

I haven’t tested, but something like the following.

    ZoneId zone = ZoneId.systemDefault();
    LocalDate today = LocalDate.now(zone);
    LocalDate min;
    LocalDate max;
    if (today.getDayOfMonth() < 16) {
        min = today.withDayOfMonth(1);
        max = today.withDayOfMonth(15);
    } else {
        min = today.withDayOfMonth(16);
        max = today.with(TemporalAdjusters.lastDayOfMonth());
    }

    DatePicker picker = dpDialog.getDatePicker();
    picker.setMinDate(min.atStartOfDay(zone).toInstant().toEpochMilli());
    picker.setMaxDate(max.atStartOfDay(zone).toInstant().toEpochMilli());

    dpDialog.show();

I am using java.time, the modern Java date and time API. While you’re at it, you may substitute your use of the age-old Calendar class and friends with the modern classes too. The modern API is so much nicer to work with.

I am hesitating to use the device time zone setting through ZoneId.systemDefault(), but since the date picker relies on it, I found no way around it. The setting may be changed at any time by another part of your program, leading to unpredictable results.

What went wrong in your code?

Comparing System.currentTimeMillis() to the value 15 won’t work. The method gives you a count of milliseconds since the epoch of January 15, 1970 at 00:00 UTC. Current values are around 1 524 000 000 000. So always much greater than 15.

Whether your time math is correct I haven’t checked. I find it quite cumbersome to do such math myself in the code. I much prefer to leave it to well-tested library methods. It’s much less error-prone it allows for much clearer code.

Question: Can I use java.time on Android?

Yes, java.time works nicely on older and newer Android devices. It just requires at least Java 6.

In Java 8 and later and on newer Android devices (from API level 26, I’m told) the modern API comes built-in.
In Java 6 and 7 get the ThreeTen Backport, the backport of the new classes (ThreeTen for JSR 310; see the links at the bottom).
On (older) Android use the Android edition of ThreeTen Backport. It’s called ThreeTenABP. And make sure you import the date and time classes from org.threeten.bp with subpackages.

Links

Oracle tutorial: Date Time explaining how to use java.time.
Java Specification Request (JSR) 310, where java.time was first described.
ThreeTen Backport project, the backport of java.timeto Java 6 and 7 (ThreeTen for JSR-310).
ThreeTenABP, Android edition of ThreeTen Backport
Question: How to use ThreeTenABP in Android Project, with a very thorough explanation.

Sorry to hear, @RAJKUMAR. If you quote the error message you get, I’ll see if I can figure out what to do about it. — Ole V.V., Apr 19 '18 at 06:57
I thought I had, @RAJKUMAR. I don’t have Android Studio, so cannot test and debug. — Ole V.V., Apr 19 '18 at 09:09

Date picker dialog date validation

2 Answers2

What went wrong in your code?

Question: Can I use java.time on Android?

Links