Materialdatepicker Returns Incorrect Date After Selection

For some unknown reason, MaterialDatePicker returns incorrect date after selection. For example, user is in Mexico region with timezone: America/Tijuana. When he selects in visual

Solution 1:

Use:

   c1.setTimeZone(TimeZone.getTimeZone("UTC"));

instead of

   c1.setTimeZone(TimeZone.getDefault());

See if this helps or not:

Calendarc1= Calendar.getInstance(Locale.getDefault())

Solution 2:

I have solved this issue with such code:

publicvoidstartDateSelectionPicker() {
        try {
            MaterialDatePicker<Long> picker = MaterialDatePicker.Builder.datePicker()
                    .setSelection(MaterialDatePicker.todayInUtcMilliseconds())
                    .setTheme(R.style.CustomDatePickerDialog)
                    .build();

            picker.addOnPositiveButtonClickListener(selection -> {
                Calendarutc= Calendar.getInstance(TimeZone.getTimeZone("UTC"));
                utc.setTimeInMillis(selection);
                Stringdate= ToolsManager.calendarToDate(this, utc, ToolsManager.LETY_FILTRATION_DATE_FORMAT);
                binding.textview.setText(date);
            });
            picker.show(getSupportFragmentManager(), picker.getTag());
        } catch (IllegalArgumentException e) {
        }
    }

publicstatic String calendarToDate(Context context, Calendar calendar, String dateFormat) {
        if (calendar == null) {
            returnnull;
        }

        Localelocale= context.getResources().getConfiguration().locale;
        DateFormatdf=newSimpleDateFormat(dateFormat, locale);
        TimeZonetimeZone= TimeZone.getTimeZone("UTC");
        df.setTimeZone(timeZone);

        Dated= calendar.getTime();
        return df.format(d);
    }

So, the core solver was to create Calendar with UTC timezone (because it works only with UTC values, and in formatted also I had to init UTC timezone, in other case it was shifting values for some hours depending on time zone.

Also these two links helped to understand: https://github.com/material-components/material-components-android/blob/00dc4c6b5af3939418f1c7d1e4c737dc3fb7fd67/docs/components/Picker.md#timezones

https://github.com/material-components/material-components-android/tree/master/catalog/java/io/material/catalog/datepicker

And converter: https://www.epochconverter.com/