public void ZMDate31 (int year, int mounch, int day){
        TextView textday = (TextView) findViewById(R.id.ZMday);
        Date dated = new Date(2021-1900, Calendar.JANUARY, 13); //первая дневная смена
        Date daten = new Date(2021-1900, Calendar.JANUARY, 14); //первая ночная смена
        Date today = new Date(year-1900, mounch, day);
        SimpleDateFormat dateFormat = new SimpleDateFormat("dd.MM.yyyy");
        while (dated.before(today)){
            dated = new Date(dated.getTime() + 345600000);
                   if (dated.getTime() == today.getTime()) {                       
                       textday.setText("Ви працюєте "+dateFormat.format(today)+" в ДЕННУ зміну.");
                   }
                   if (dated.getTime() > today.getTime()) {
                       while (daten.before(today)){
                           daten = new Date(daten.getTime() + 345600000);
                           if (daten.getTime() == today.getTime()) {                               
                               textday.setText("Ви працюєте "+dateFormat.format(today)+" в НІЧНУ зміну.");
                           }
                           if (daten.getTime() > today.getTime()) {                               
                               textday.setText("Ура!!! "+dateFormat.format(today)+" Ви вільні від роботи.");
                           }
                       }
                   }
       }
    }