Android Material Date Picker Date Format

Question

I'm using material date picker in my app to select dates. Below is my code.

MaterialDatePicker.Builder builder = MaterialDatePicker.Builder.datePicker();
    builder.setSelection(Calendar.getInstance().getTimeInMillis());
    builder.setTitleText(getString(R.string.selectDate));
    final MaterialDatePicker materialDatePicker = builder.build();

    btn_pickDate(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            materialDatePicker.show(getSupportFragmentManager(),"DATE_PICKER");
        }
    });
    
    materialDatePicker.addOnPositiveButtonClickListener(new MaterialPickerOnPositiveButtonClickListener() {
        @Override
        public void onPositiveButtonClick(Object selection) {
            startDate.setText(materialDatePicker.getHeaderText());
        }
    });

when I select a date, the date is returned in dd MMM yyyy in device one and MMM dd, yyyy in device two.

I need the date to be returned in same format (Ex: dd MMM yyyy) across all devices. How to achieve this in material date picker.

Answer 1

The addOnPositiveButtonClickListener listener returns the selected date as Long value. In this way you have a long value and not a String.

You can use:

    MaterialDatePicker<Long> materialDatePicker = builder.build();
    
    materialDatePicker.addOnPositiveButtonClickListener(new MaterialPickerOnPositiveButtonClickListener<Long>() {
        @Override
        public void onPositiveButtonClick(Long selection) {
           //....
           Calendar calendar = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
           calendar.setTimeInMillis(selection);
           SimpleDateFormat format = new SimpleDateFormat("yyyy MM dd");
           String formattedDate  = format.format(calendar.getTime());
        }
    });

In kotlin:

materialDatePicker.addOnPositiveButtonClickListener {
    val utc = Calendar.getInstance(TimeZone.getTimeZone("UTC"))
    utc.timeInMillis = it
    val format = SimpleDateFormat("yyyy-MM-dd")
    val formatted: String = format.format(utc.time)        
}