DateTimeUtils.java

import java.util.Calendar;

public class DateTimeUtils {

    private static final long SEC = 1000;
    private static final long MIN = SEC * 60;
    private static final long HOUR = MIN * 60;
    private static final long DAY = HOUR * 24;
    private static final long WEEK = DAY * 7;
    private static final long YESTERDAY = DAY * 2;
    private static final long YEAR = DAY * 365;
    private static final long MONTH;

    static {
        int dayInFebruary = 28;
        int year = Calendar.getInstance().get(Calendar.YEAR);
        if (((year % 4 == 0) && (year % 100 != 0)) || (year % 400 == 0)) {
            dayInFebruary = 29;
        }
        int[] DAY_IN_MONTH = new int[]{31, dayInFebruary, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
        MONTH = DAY * (DAY_IN_MONTH[Calendar.getInstance().get(Calendar.MONTH)]);
    }

    private DateTimeUtils() {
    }

    public static ArrayList<Long> getWeekDayArray(long date) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTimeInMillis(date);
        int dayOfWeek = calendar.get(Calendar.DAY_OF_WEEK);
        Long[] dayValues = new Long[7];
        long ONE_DAY_IN_MILLIS = TimeUnit.DAYS.toMillis(1);
        for (int pos = 0; pos < dayOfWeek; pos++) {
            dayValues[dayOfWeek - 1 - pos] = calendar.getTimeInMillis();
            calendar.setTimeInMillis(calendar.getTimeInMillis() - ONE_DAY_IN_MILLIS);
        }
        calendar.setTimeInMillis(date);
        for (int pos = dayOfWeek - 1; pos < 7; pos++) {
            dayValues[pos] = calendar.getTimeInMillis();
            calendar.setTimeInMillis(calendar.getTimeInMillis() + ONE_DAY_IN_MILLIS);
        }
        return new ArrayList<>(Arrays.asList(dayValues));
    }
    
    /**
     * show formatted time from now
     */
    public static String fromNow(long firstTime, long secondTime) {
        StringBuilder stringBuilder = new StringBuilder();
        long diff = Math.abs(secondTime - firstTime);

        // year
        long year = getYear(diff);
        if (year > 0) {
            stringBuilder.append(year).append(" year");
            if (year > 1) {
                stringBuilder.append("s");
            }
            stringBuilder.append(" ");
            diff = (diff - (YEAR * year));
        }

        // month
        long month = getMonth(diff);
        if (month > 0) {
            stringBuilder.append(month).append(" month");
            if (month > 1) {
                stringBuilder.append("s");
            }
            stringBuilder.append(" ");
            diff = diff - (MONTH * month);
        }

        // week
        long week = getWeek(diff);
        if (week > 0) {
            stringBuilder.append(week).append(" week");
            if (week > 1) {
                stringBuilder.append("s");
            }
            stringBuilder.append(" ");
            diff = diff - (WEEK * week);
        }

        // day
        long day = getDay(diff);
        if (day > 0) {
            stringBuilder.append(day).append(" day");
            if (day > 1) {
                stringBuilder.append("s");
            }
            stringBuilder.append(" ");
            diff = diff - (DAY * day);
        }

        // hour
        long hour = getHour(diff);
        if (hour > 0) {
            stringBuilder.append(hour).append(" hour");
            if (hour > 1) {
                stringBuilder.append("s");
            }
            stringBuilder.append(" ");
            diff = diff - (HOUR * hour);
        }

        // minute
        long minute = getMinute(diff);
        if (minute > 0) {
            stringBuilder.append(minute).append(" minute");
            if (minute > 1) {
                stringBuilder.append("s");
            }
            stringBuilder.append(" ");
            diff = diff - (MIN * minute);
        }

        // second
        long second = getSecond(diff);
        if (minute > 0) {
            stringBuilder.append(second).append(" second");
            if (second > 1) {
                stringBuilder.append("s");
            }
            //stringBuilder.append(" ");
            //diff = diff - (SEC * second);
        }

        return stringBuilder.toString();
    }

    public static long getSecond(long time) {
        return time / SEC;
    }

    public static long getMinute(long time) {
        return time / MIN;
    }

    public static long getHour(long time) {
        return time / HOUR;
    }

    public static long getDay(long time) {
        return time / DAY;
    }

    public static long getWeek(long time) {
        return time / WEEK;
    }

    public static long getMonth(long time) {
        return time / MONTH;
    }

    public static long getYear(long time) {
        return time / YEAR;
    }
}


/**

SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
try {
    Date startDate = simpleDateFormat.parse("2016-05-01 18:25:10");
    Date endDate = simpleDateFormat.parse("2017-07-25 20:00:00");
    String dateFormatted = DateTimeUtils.fromNow(startDate.getTime(), endDate.getTime());
    Log.e(TAG, "onCreate: " + dateFormatted);
} catch (ParseException e) {
    e.printStackTrace();
}

Output:

onCreate: 1 year 2 months 3 weeks 2 days 1 hour 34 minutes 50 seconds

**/