Calculate Difference between two times in Android

Question

I have two string variables such as StartTime and EndTime. I need to Calculate the TotalTime by subtracting the EndTime with StartTime.

The Format of StartTime and E

Answer 1

String mStrDifferenceTime =compareTwoTimeAMPM("11:06 PM","05:07 AM");
Log.e("App---Time ", mStrDifferenceTime+" Minutes");

public static String getCurrentDateUsingCalendar() {
    Date mDate = new Date();  // to get the date
    @SuppressLint("SimpleDateFormat") SimpleDateFormat mSimpleDateFormat = new SimpleDateFormat("dd-MM-yyyy"); // getting date in this format
    return mSimpleDateFormat.format(mDate.getTime());
}

public static String getNextDateUsingCalendar() {
    Calendar mCalendar = Calendar.getInstance();
    mCalendar.add(Calendar.DAY_OF_YEAR, 1);
    Date mStrTomorrow = mCalendar.getTime();
    @SuppressLint("SimpleDateFormat") DateFormat mDateFormat = new SimpleDateFormat("dd-MM-yyyy");
    return mDateFormat.format(mStrTomorrow);

}

public static String compareTwoTimeAMPM(String mStrStartTime, String mStrEndTime) {
    String mStrCompareStartTime[] = mStrStartTime.split(" ");
    String mStrCompareEndTime[] = mStrEndTime.split(" ");
    int mIStartTime = Integer.parseInt(mStrCompareStartTime[0].replace(":", ""));
    int mIEndTime = Integer.parseInt(mStrCompareEndTime[0].replace(":", ""));
    String mStrToday = "";
    String mStrTomorrow = "";
    if (mIStartTime < mIEndTime && mStrCompareStartTime[1].equals("PM") && mStrCompareEndTime[1].equals("PM")) {
        mStrToday = getCurrentDateUsingCalendar();
        mStrTomorrow = getCurrentDateUsingCalendar();
    } else if (mIStartTime < mIEndTime && mStrCompareStartTime[1].equals("AM") && mStrCompareEndTime[1].equals("AM")) {
        mStrToday = getCurrentDateUsingCalendar();
        mStrTomorrow = getCurrentDateUsingCalendar();
    } else if (mIStartTime > mIEndTime && mStrCompareStartTime[1].equals("PM") && mStrCompareEndTime[1].equals("PM")) {
        String mStrTime12[] = mStrCompareStartTime[0].split(":");
        if (mStrTime12[0].equals("12")) {
            mStrToday = getNextDateUsingCalendar();
            mStrTomorrow = getNextDateUsingCalendar();
        } else {
            mStrToday = getCurrentDateUsingCalendar();
            mStrTomorrow = getNextDateUsingCalendar();
        }
    } else if (mIStartTime > mIEndTime && mStrCompareStartTime[1].equals("AM") && mStrCompareEndTime[1].equals("AM")) {
        String mStrTime12[] = mStrCompareStartTime[0].split(":");
        if (mStrTime12[0].equals("12")) {
            mStrToday = getNextDateUsingCalendar();
            mStrTomorrow = getNextDateUsingCalendar();
        } else {
            mStrToday = getCurrentDateUsingCalendar();
            mStrTomorrow = getNextDateUsingCalendar();
        }
    } else if (mStrCompareStartTime[1].equals("PM") && mStrCompareEndTime[1].equals("AM")) {
        mStrToday = getCurrentDateUsingCalendar();
        mStrTomorrow = getNextDateUsingCalendar();
    } else if (mStrCompareStartTime[1].equals("AM") && mStrCompareEndTime[1].equals("PM")) {
        mStrToday = getCurrentDateUsingCalendar();
        mStrTomorrow = getCurrentDateUsingCalendar();
    }
    @SuppressLint("SimpleDateFormat") SimpleDateFormat simpleDateFormat = new SimpleDateFormat("dd-MM-yyyy hh:mm aa");
    String mStrDifference = "";
    try {
        Date date1 = simpleDateFormat.parse(mStrToday + " " + mStrStartTime);
        Date date2 = simpleDateFormat.parse(mStrTomorrow + " " + mStrEndTime);
        mStrDifference = differenceDatesAndTime(date1, date2);
    } catch (ParseException e) {
        e.printStackTrace();
    }

    return mStrDifference;

}


public static String differenceDatesAndTime(Date mDateStart, Date mDateEnd) {

    long different = mDateEnd.getTime() - mDateStart.getTime();
    long secondsInMilli = 1000;
    long minutesInMilli = secondsInMilli * 60;
    long hoursInMilli = minutesInMilli * 60;
    long daysInMilli = hoursInMilli * 24;

    long elapsedDays = different / daysInMilli;
    different = different % daysInMilli;

    long elapsedHours = different / hoursInMilli;
    different = different % hoursInMilli;

    long elapsedMinutes = different / minutesInMilli;

    long minutes = elapsedHours * 60 + elapsedMinutes;
    long result = elapsedDays * 24 * 60 + minutes;
    if (0 > result) {
        result = result + 720;  //result is minus then add 12*60 minutes
    }

    return result + "";
}

My output is E/App---Time: 361 Minutes