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JAVA : calculateFine() in my library management system without using database [duplicate]

I want a Java program that calculates days between two dates.
Type the first date (German notation; with whitespaces: "dd mm yyyy")
Type the second date.
The program should calculates the number of days between the two dates.
How can I include leap years and summertime?
My code:
import java.util.Calendar;
import java.util.Date;
import java.util.Scanner;
public class NewDateDifference {
public static void main(String[] args) {
System.out.print("Insert first date: ");
Scanner s = new Scanner(System.in);
String[] eingabe1 = new String[3];
while (s.hasNext()) {
int i = 0;
insert1[i] = s.next();
if (!s.hasNext()) {
s.close();
break;
}
i++;
}
System.out.print("Insert second date: ");
Scanner t = new Scanner(System.in);
String[] insert2 = new String[3];
while (t.hasNext()) {
int i = 0;
insert2[i] = t.next();
if (!t.hasNext()) {
t.close();
break;
}
i++;
}
Calendar cal = Calendar.getInstance();
cal.set(Calendar.DAY_OF_MONTH, Integer.parseInt(insert1[0]));
cal.set(Calendar.MONTH, Integer.parseInt(insert1[1]));
cal.set(Calendar.YEAR, Integer.parseInt(insert1[2]));
Date firstDate = cal.getTime();
cal.set(Calendar.DAY_OF_MONTH, Integer.parseInt(insert2[0]));
cal.set(Calendar.MONTH, Integer.parseInt(insert2[1]));
cal.set(Calendar.YEAR, Integer.parseInt(insert2[2]));
Date secondDate = cal.getTime();
long diff = secondDate.getTime() - firstDate.getTime();
System.out.println ("Days: " + diff / 1000 / 60 / 60 / 24);
}
}

UPDATE: The original answer from 2013 is now outdated because some of the classes have been replaced. The new way of doing this is using the new java.time classes.
DateTimeFormatter dtf = DateTimeFormatter.ofPattern("dd MM yyyy");
String inputString1 = "23 01 1997";
String inputString2 = "27 04 1997";
try {
LocalDateTime date1 = LocalDate.parse(inputString1, dtf);
LocalDateTime date2 = LocalDate.parse(inputString2, dtf);
long daysBetween = Duration.between(date1, date2).toDays();
System.out.println ("Days: " + daysBetween);
} catch (ParseException e) {
e.printStackTrace();
}
Note that this solution will give the number of actual 24 hour-days, not the number of calendar days. For the latter, use
long daysBetween = ChronoUnit.DAYS.between(date1, date2)
Original answer (outdated as of Java 8)
You are making some conversions with your Strings that are not necessary. There is a SimpleDateFormat class for it - try this:
SimpleDateFormat myFormat = new SimpleDateFormat("dd MM yyyy");
String inputString1 = "23 01 1997";
String inputString2 = "27 04 1997";
try {
Date date1 = myFormat.parse(inputString1);
Date date2 = myFormat.parse(inputString2);
long diff = date2.getTime() - date1.getTime();
System.out.println ("Days: " + TimeUnit.DAYS.convert(diff, TimeUnit.MILLISECONDS));
} catch (ParseException e) {
e.printStackTrace();
}
EDIT: Since there have been some discussions regarding the correctness of this code: it does indeed take care of leap years. However, the TimeUnit.DAYS.convert function loses precision since milliseconds are converted to days (see the linked doc for more info). If this is a problem, diff can also be converted by hand:
float days = (diff / (1000*60*60*24));
Note that this is a float value, not necessarily an int.

Simplest way:
public static long getDifferenceDays(Date d1, Date d2) {
long diff = d2.getTime() - d1.getTime();
return TimeUnit.DAYS.convert(diff, TimeUnit.MILLISECONDS);
}

In Java 8, you could accomplish this by using LocalDate and DateTimeFormatter. From the Javadoc of LocalDate:
LocalDate is an immutable date-time object that represents a date,
often viewed as year-month-day.
And the pattern can be constructed using DateTimeFormatter. Here is the Javadoc, and the relevant pattern characters I used:
Symbol - Meaning - Presentation - Examples
y - year-of-era - year - 2004; 04
M/L - month-of-year - number/text - 7; 07; Jul;
July; J
d - day-of-month - number - 10
Here is the example:
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.time.LocalDate;
import java.time.format.DateTimeFormatter;
import java.time.temporal.ChronoUnit;
public class Java8DateExample {
public static void main(String[] args) throws IOException {
final DateTimeFormatter formatter = DateTimeFormatter.ofPattern("dd MM yyyy");
final BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
final String firstInput = reader.readLine();
final String secondInput = reader.readLine();
final LocalDate firstDate = LocalDate.parse(firstInput, formatter);
final LocalDate secondDate = LocalDate.parse(secondInput, formatter);
final long days = ChronoUnit.DAYS.between(firstDate, secondDate);
System.out.println("Days between: " + days);
}
}
Example input/output with more recent last:
23 01 1997
27 04 1997
Days between: 94
With more recent first:
27 04 1997
23 01 1997
Days between: -94
Well, you could do it as a method in a simpler way:
public static long betweenDates(Date firstDate, Date secondDate) throws IOException
{
return ChronoUnit.DAYS.between(firstDate.toInstant(), secondDate.toInstant());
}

Most / all answers caused issues for us when daylight savings time came around. Here's our working solution for all dates, without using JodaTime. It utilizes calendar objects:
public static int daysBetween(Calendar day1, Calendar day2){
Calendar dayOne = (Calendar) day1.clone(),
dayTwo = (Calendar) day2.clone();
if (dayOne.get(Calendar.YEAR) == dayTwo.get(Calendar.YEAR)) {
return Math.abs(dayOne.get(Calendar.DAY_OF_YEAR) - dayTwo.get(Calendar.DAY_OF_YEAR));
} else {
if (dayTwo.get(Calendar.YEAR) > dayOne.get(Calendar.YEAR)) {
//swap them
Calendar temp = dayOne;
dayOne = dayTwo;
dayTwo = temp;
}
int extraDays = 0;
int dayOneOriginalYearDays = dayOne.get(Calendar.DAY_OF_YEAR);
while (dayOne.get(Calendar.YEAR) > dayTwo.get(Calendar.YEAR)) {
dayOne.add(Calendar.YEAR, -1);
// getActualMaximum() important for leap years
extraDays += dayOne.getActualMaximum(Calendar.DAY_OF_YEAR);
}
return extraDays - dayTwo.get(Calendar.DAY_OF_YEAR) + dayOneOriginalYearDays ;
}
}

The best way, and it converts to a String as bonus ;)
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
try {
//Dates to compare
String CurrentDate= "09/24/2015";
String FinalDate= "09/26/2015";
Date date1;
Date date2;
SimpleDateFormat dates = new SimpleDateFormat("MM/dd/yyyy");
//Setting dates
date1 = dates.parse(CurrentDate);
date2 = dates.parse(FinalDate);
//Comparing dates
long difference = Math.abs(date1.getTime() - date2.getTime());
long differenceDates = difference / (24 * 60 * 60 * 1000);
//Convert long to String
String dayDifference = Long.toString(differenceDates);
Log.e("HERE","HERE: " + dayDifference);
}
catch (Exception exception) {
Log.e("DIDN'T WORK", "exception " + exception);
}
}

Use:
public int getDifferenceDays(Date d1, Date d2) {
int daysdiff = 0;
long diff = d2.getTime() - d1.getTime();
long diffDays = diff / (24 * 60 * 60 * 1000) + 1;
daysdiff = (int) diffDays;
return daysdiff;
}

Java date libraries are notoriously broken. I would advise to use Joda Time. It will take care of leap year, time zone and so on for you.
Minimal working example:
import java.util.Scanner;
import org.joda.time.DateTime;
import org.joda.time.Days;
import org.joda.time.LocalDate;
import org.joda.time.format.DateTimeFormat;
import org.joda.time.format.DateTimeFormatter;
public class DateTestCase {
public static void main(String[] args) {
System.out.print("Insert first date: ");
Scanner s = new Scanner(System.in);
String firstdate = s.nextLine();
System.out.print("Insert second date: ");
String seconddate = s.nextLine();
// Formatter
DateTimeFormatter dateStringFormat = DateTimeFormat
.forPattern("dd MM yyyy");
DateTime firstTime = dateStringFormat.parseDateTime(firstdate);
DateTime secondTime = dateStringFormat.parseDateTime(seconddate);
int days = Days.daysBetween(new LocalDate(firstTime),
new LocalDate(secondTime)).getDays();
System.out.println("Days between the two dates " + days);
}
}

String dateStart = "01/14/2015 08:29:58";
String dateStop = "01/15/2015 11:31:48";
//HH converts hour in 24 hours format (0-23), day calculation
SimpleDateFormat format = new SimpleDateFormat("MM/dd/yyyy HH:mm:ss");
Date d1 = null;
Date d2 = null;
d1 = format.parse(dateStart);
d2 = format.parse(dateStop);
//in milliseconds
long diff = d2.getTime() - d1.getTime();
long diffSeconds = diff / 1000 % 60;
long diffMinutes = diff / (60 * 1000) % 60;
long diffHours = diff / (60 * 60 * 1000) % 24;
long diffDays = diff / (24 * 60 * 60 * 1000);
System.out.print(diffDays + " days, ");
System.out.print(diffHours + " hours, ");
System.out.print(diffMinutes + " minutes, ");
System.out.print(diffSeconds + " seconds.");

want to get just days(no times) you can use ChronoUnit
ChronoUnit.DAYS.between(date1.toLocalDate(), date2.toLocalDate());

We can make use of LocalDate and ChronoUnit java library, Below code is working fine.
Date should be in format yyyy-MM-dd.
import java.time.LocalDate;
import java.time.temporal.ChronoUnit;
import java.util.*;
class Solution {
public int daysBetweenDates(String date1, String date2) {
LocalDate dt1 = LocalDate.parse(date1);
LocalDate dt2= LocalDate.parse(date2);
long diffDays = ChronoUnit.DAYS.between(dt1, dt2);
return Math.abs((int)diffDays);
}
}

When I run your program, it doesn't even get me
to the point where I can enter the second date.
This is simpler and less error prone.
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.text.SimpleDateFormat;
import java.util.Date;
public class Test001 {
public static void main(String[] args) throws Exception {
BufferedReader br = null;
br = new BufferedReader(new InputStreamReader(System.in));
SimpleDateFormat sdf = new SimpleDateFormat("dd MM yyyy");
System.out.println("Insert first date : ");
Date dt1 = sdf.parse(br.readLine().trim());
System.out.println("Insert second date : ");
Date dt2 = sdf.parse(br.readLine().trim());
long diff = dt2.getTime() - dt1.getTime();
System.out.println("Days: " + diff / 1000L / 60L / 60L / 24L);
if (br != null) {
br.close();
}
}
}

// date format, it will be like "2015-01-01"
private static final String DATE_FORMAT = "yyyy-MM-dd";
// convert a string to java.util.Date
public static Date convertStringToJavaDate(String date)
throws ParseException {
DateFormat dataFormat = new SimpleDateFormat(DATE_FORMAT);
return dataFormat.parse(date);
}
// plus days to a date
public static Date plusJavaDays(Date date, int days) {
// convert to jata-time
DateTime fromDate = new DateTime(date);
DateTime toDate = fromDate.plusDays(days);
// convert back to java.util.Date
return toDate.toDate();
}
// return a list of dates between the fromDate and toDate
public static List<Date> getDatesBetween(Date fromDate, Date toDate) {
List<Date> dates = new ArrayList<Date>(0);
Date date = fromDate;
while (date.before(toDate) || date.equals(toDate)) {
dates.add(date);
date = plusJavaDays(date, 1);
}
return dates;
}

The following works perfectly well for me:
public int daysBetween(LocalDate later, LocalDate before) {
SimpleDateFormat myFormat = new SimpleDateFormat("dd MM yyyy");
int daysBetween = 0;
try {
Date dateBefore = myFormat.parse(localDateToString(before));
Date dateAfter = myFormat.parse(localDateToString(later));
long difference = dateAfter.getTime() - dateBefore.getTime();
daysBetween = (int) (difference / (1000 * 60 * 60 * 24));
} catch (Exception e) {
e.printStackTrace();
}
return daysBetween;
}
public String localDateToString(LocalDate date) {
DateTimeFormatter myFormat = DateTimeFormatter.ofPattern("dd MM yyyy");
return date.format(myFormat).toString();
}

All the other answers had lots of scary things, here's my simple solution:
public int getDaysDiff(Date dateToCheck)
{
long diffMilliseconds = new Date().getTime() - dateToCheck.getTime();
double diffSeconds = diffMilliseconds / 1000;
double diffMinutes = diffSeconds / 60;
double diffHours = diffMinutes / 60;
double diffDays = diffHours / 24;
return (int) Math.round(diffDays);
}

public class TestCode {
public static void main(String[] args) {
String date1 = "23-04-2021";
String date2 = "24-05-2021";
System.out.println("NDays: " + nDays_Between_Dates(date1, date2));
}
public static int nDays_Between_Dates(String date1, String date2) {
int diffDays = 0;
try {
SimpleDateFormat dates = new SimpleDateFormat("dd-MM-yyyy");
Date startDate = dates.parse(date1);
Date endDate = dates.parse(date2);
long diff = endDate.getTime() - startDate.getTime();
diffDays = (int) (diff / (24 * 60 * 60 * 1000));
} catch (ParseException e) {
e.printStackTrace();
}
return Math.abs(diffDays);
}
}
Output: NDays: 31

public static String dateCalculation(String getTime, String dependTime) {
//Time A is getTime that need to calculate.
//Time B is static time that Time A depend on B Time and calculate the result.
Date date = new Date();
final SimpleDateFormat sdf = new SimpleDateFormat("yyy-MM-dd H:mm:ss");
Date dateObj = null;
Date checkDate = null;
try {
dateObj = sdf.parse(getTime);
} catch (ParseException e) {
e.printStackTrace();
return "0";
}
SimpleDateFormat dateFormat = new SimpleDateFormat("HH:mm:ss");
String checkInDate = dateFormat.format(dateObj).toString();
Date defaultTime = null;
try {
defaultTime = dateFormat.parse(dependTime);
checkDate = dateFormat.parse(checkInDate);
} catch (ParseException e) {
e.printStackTrace();
return "0";
}
try {
if (dateFormat.parse(dateFormat.format(date)).after(defaultTime)) {
long diff = checkDate.getTime() - defaultTime.getTime();
Log.e("Difference", "onBindViewHolder: Difference: " + dateObj + " : " + defaultTime + " : " + diff);
if (diff > 0) {
long diffSeconds = diff / 1000 % 60;
long diffMinutes = diff / (60 * 1000) % 60;
long diffHours = diff / (60 * 60 * 1000);
return "Late: " + diffHours + " Hour, " + diffMinutes + " Minutes, " + diffSeconds + " Sec";
} else {
return "0";
}
}
} catch (ParseException e) {
e.printStackTrace();
return "0";
}
return "0";
}

How to fix error with CountDownTimer in android app

I'm trying to make a countdown in days, hours, minutes, seconds from a starting date and I'm getting the days wrong for some reason I cannot find.
String givenDateString = "2019-05-15T09:00:00";
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss");
try {
Date mDate = sdf.parse(givenDateString);
timeInMilliseconds = mDate.getTime();
} catch (ParseException e) {
e.printStackTrace();
}
new CountDownTimer(timeInMilliseconds, 1000) {
#Override
public void onTick(long millisUntilFinished) {
long day = TimeUnit.MILLISECONDS.toDays(millisUntilFinished);
millisUntilFinished -= TimeUnit.DAYS.toMillis(day);
long hour = TimeUnit.MILLISECONDS.toHours(millisUntilFinished);
millisUntilFinished -= TimeUnit.HOURS.toMillis(hour);
long minute = TimeUnit.MILLISECONDS.toMinutes(millisUntilFinished);
millisUntilFinished -= TimeUnit.MINUTES.toMillis(minute);
long second = TimeUnit.MILLISECONDS.toSeconds(millisUntilFinished);
prueba.setText("Days: "+day+" Hours: "+hour+" Minutes: "+minute+" Seconds: "+second);
}
#Override
public void onFinish() {
// What ever you want !
}
}.start();
And I'm getting this result:
New error android.view.ViewRootImpl$CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views.
TextView prueba;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
prueba = findViewById(R.id.prueba);
Timer timer = new Timer();
timer.schedule(new TimerTask() {
#Override
public void run() {
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss");
Date currentDate = null;
Date destinationDate = null;
try {
currentDate = Calendar.getInstance().getTime();
destinationDate = sdf.parse("2019-05-15T09:00:00");
} catch (ParseException e) {
e.printStackTrace();
}
calculateDifference(currentDate, destinationDate);
}
}, 0, 1000);//Update text every second
}
public void calculateDifference(Date startDate, Date endDate) {
long different = endDate.getTime() - startDate.getTime();
long secondsInMilli = 1000;
long minutesInMilli = secondsInMilli * 60;
long hoursInMilli = minutesInMilli * 60;
long daysInMilli = hoursInMilli * 24;
long days = different / daysInMilli;
different = different % daysInMilli;
long hours = different / hoursInMilli;
different = different % hoursInMilli;
long minutes = different / minutesInMilli;
different = different % minutesInMilli;
long seconds = different / secondsInMilli;
Log.e("calculation", "Days: " + days + " Hours: " + hours + " Minutes: " + minutes + " Seconds: " + seconds);
prueba.setText("Days: " + days + " Hours: " + hours + " Minutes: " + minutes + " Seconds: " + seconds);
}

Hello there here is how you can achieve this
Here is the method which calculate the difference between two date.
public void calculateDifference(Date startDate, Date endDate) {
long different = endDate.getTime() - startDate.getTime();
long secondsInMilli = 1000;
long minutesInMilli = secondsInMilli * 60;
long hoursInMilli = minutesInMilli * 60;
long daysInMilli = hoursInMilli * 24;
long days = different / daysInMilli;
different = different % daysInMilli;
long hours = different / hoursInMilli;
different = different % hoursInMilli;
long minutes = different / minutesInMilli;
different = different % minutesInMilli;
long seconds = different / secondsInMilli;
Log.e("calculation", "Days: " + days + " Hours: " + hours + " Minutes: " + minutes + " Seconds: " + seconds);
}
You can settext of you text view instead of log
And this is how you can call the timer with date
Timer timer = new Timer();
timer.schedule(new TimerTask() {
#Override
public void run() {
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss");
Date currentDate = null;
Date destinationDate = null;
try {
currentDate = Calendar.getInstance().getTime();
destinationDate = sdf.parse("2019-05-15T09:00:00");
} catch (ParseException e) {
e.printStackTrace();
}
calculateDifference(currentDate, destinationDate);
}
}, 0, 1000);//Update text every second
}

how to delete call Log of last 24 hours android

public void delete() {
String strUriCalls = "content://call_log/calls";
Uri UriCalls = Uri.parse(strUriCalls);
Cursor cc = getContext().getContentResolver().query(UriCalls, null, null, null, null);
int number = cc.getColumnIndex(CallLog.Calls.NUMBER);
int date = cc.getColumnIndex(CallLog.Calls.DATE);
if (cc.getCount() <= 0)
{
Toast.makeText(getContext(), "Call log empty", Toast.LENGTH_SHORT).show();
}
while (cc.moveToNext()) {
String callNumber = cc.getString(number);
String callDate = cc.getString(date);
sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm");
try {
systemDate = Calendar.getInstance().getTime();
String myDate1 = sdf.format(systemDate);
//txtCurrentTime.setText(myDate);
cDate = sdf.format(Long.parseLong(callDate));
Date1 = sdf.parse(myDate1);
Date2 = sdf.parse(cDate);
//to get time diff between current date and call date
millse = Date1.getTime() - Date2.getTime();
mills = Math.abs(millse);
// to change the return value into specific time format
long hh = (mills / (1000 * 60 * 60));
Mins = (int) (mills / (1000 * 60)) % 60;
long Secs = (int) (mills / 1000) % 60;
long timeDifDays = mills / (24 * 60 * 60 * 1000);
if (timeDifDays >= 24) {
int i = getContext().getContentResolver().delete(UriCalls, callNumber, null);
if (i >= 1)
{
Toast.makeText(getContext(), "Number deleted", Toast.LENGTH_SHORT).show();
} else
{
Toast.makeText(getContext(), "No such number in call logs", Toast.LENGTH_SHORT).show();
}
}
} catch (Exception e) {
}
}
}
It deletes all the records of a particular number if one record satisfies the condition, I want to delete the satisfying record only.

public void delete() {
String strUriCalls = "content://call_log/calls";
Uri UriCalls = Uri.parse(strUriCalls);
Cursor cc = getContext().getContentResolver().query(UriCalls, null, null, null, null);
int number = cc.getColumnIndex(CallLog.Calls._ID);
int date = cc.getColumnIndex(CallLog.Calls.DATE);
if (cc.getCount() <= 0)
{
Toast.makeText(getContext(), "Call log empty", Toast.LENGTH_SHORT).show();
}
while (cc.moveToNext()) {
String callNumber = cc.getString(number);
String callDate = cc.getString(date);
sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm");
try {
systemDate = Calendar.getInstance().getTime();
String myDate1 = sdf.format(systemDate);
//txtCurrentTime.setText(myDate);
cDate = sdf.format(Long.parseLong(callDate));
Date1 = sdf.parse(myDate1);
Date2 = sdf.parse(cDate);
//to get time diff between current date and call date
millse = Date1.getTime() - Date2.getTime();
mills = Math.abs(millse);
// to change the return value into specific time format
long hh = (mills / (1000 * 60 * 60));
Mins = (int) (mills / (1000 * 60)) % 60;
long Secs = (int) (mills / 1000) % 60;
long timeDifDays = mills / (24 * 60 * 60 * 1000);
if (timeDifDays >= 24) {
int i = getContext().getContentResolver().delete(UriCalls, BaseColumns._ID+"=?", new String[]{callNumber});
if (i >= 1)
{
Toast.makeText(getContext(), "Number deleted", Toast.LENGTH_SHORT).show();
} else
{
Toast.makeText(getContext(), "No such number in call logs", Toast.LENGTH_SHORT).show();
}
}
} catch (Exception e) {
}
}
}

How to find difference between to dates [duplicate]

This question already has answers here:
getting the difference between date in days in java [duplicate]
(3 answers)
Calculating the difference between two Java date instances
(45 answers)
Closed 6 years ago.
I have two dates with string format "16-Feb-2017", "26-Feb-2017"
and I used
SimpleDateFormat simpleDateFormat = new SimpleDateFormat("dd-MMM-yyyy");
but I am unable to get exact result like "10".

Hope this will help you.pass your dates in myDate and time_ago.
int totalMin;
SimpleDateFormat sdf = new SimpleDateFormat("MM/dd/yyyy HH:mm:ss", Locale.ENGLISH);
Date systemDate = Calendar.getInstance().getTime();
String myDate = sdf.format(systemDate);
Date Date1 = null;
try {
Date1 = sdf.parse(myDate);
} catch (ParseException e) {
e.printStackTrace();
}
Date Date2 = null;
try {
Date2 = sdf.parse(time_ago);
} catch (ParseException e) {
e.printStackTrace();
}
assert Date2 != null;
assert Date1 != null;
long millse = Date1.getTime() - Date2.getTime();
long mills = Math.abs(millse);
Hours = (int) (mills / (1000 * 60 * 60));
Mins = (int) (mills / (1000 * 60)) % 60;
Secs = (int) (mills / 1000) % 60;
long diffDays = millse / (24 * 60 * 60 * 1000);
if (Secs >= 60) {
Mins = Mins + 1;
Secs = Secs - 60;
} else if (Mins >= 60) {
Hours = Hours + 1;
Mins = Mins - 60;
}
totalMin = (int) ((Mins) + (Secs / 60));
String t_time;
if (diffDays > 0) {
if (diffDays == 1) {
t_time = diffDays + " day";
} else {
t_time = diffDays + " days";
}
} else if (Hours > 0) {
if (Hours == 1) {
t_time = Hours + " hour";
} else {
t_time = Hours + " hours";
}
} else if (Mins > 0) {
if (Mins == 1) {
t_time = totalMin + " minute";
} else {
t_time = totalMin + " minutes";
}
} else {
if (Secs == 1) {
t_time = Secs + " second";
} else {
t_time = Secs + " seconds";
}
}

DateTimeFormatter formatter = DateTimeFormatter.ofPattern("dd-MMM-yyyy");
java.time.LocalDate d1 = java.time.LocalDate.parse("16-Feb-2017", formatter);
java.time.LocalDate d2 = java.time.LocalDate.parse("26-Feb-2017", formatter);
Period until = d1.until(d2);
System.out.println("Dif: " + until.getDays());

Please use below code to init SimpleDateFormat.
SimpleDateFormat dateFormat = new SimpleDateFormat("dd-MMM-yyyy", Locale.ENGLISH);

As I already said in a comment, use Java 8 java.time classes if you can. kamehl23’s answer shows you how. It’s a both elegant and robust solution, also across changes to and from summer time (DST).
EDIT: Stuck with an older Java version, they say you can use either ThreeTenABP or Joda time, I haven’t tried any of them. ThreeTenABP, I read, is an Android adaption of a backport of java.time to Java 6 and 7, so I would be tempted to give that a shot.
You can of course get through with Java 1.1 Calendar. The solution that also works across summer time change is:
String formattedDate1 = "16-Feb-2017";
String formattedDate2 = "26-Feb-2017";
DateFormat df = new SimpleDateFormat("dd-MMM-yyyy", YOUR_LOCALE);
Date d1 = df.parse(formattedDate1);
Calendar cal1 = Calendar.getInstance();
cal1.setTime(d1);
Date d2 = df.parse(formattedDate2);
Calendar cal2 = Calendar.getInstance();
cal2.setTime(d2);
int daysBetween = 0;
while (cal1.before(cal2)) {
daysBetween++;
cal1.add(Calendar.DATE, 1);
}
System.out.println(daysBetween);
This prints 10. It’s neither very elegant nor very efficient, but it works robustly as long as the ‘from’ date is before (or the same as) the ‘to’ date (which can easily be checked).

How to get "Time Difference" in "since/ago"? Is this possible without use of any library?

I want to change the format of, Currently Date(YYYY-MM-DD) and Time (SS:MM:HH) to 'n' Months ago,'n' Days ago , 'n' Hours "ago" format.
CURRENT FORMAT:
REQUIRED FORMAT:
I am using Bean and Adapter class to get Current Date. Code is given Below;
Adapter Class:
public class MessageAdapter extends BaseAdapter {
private Activity activity;
private List<MessageBean> messageBeanList;
public ImageLoader imageLoader;
private Context context;
public MessageAdapter (Activity activity,List<MessageBean> messageBeanList)
{
super();
this.activity = activity;
// this.context = context;
this.messageBeanList = messageBeanList;
this.context=context;
}
#Override
public int getCount() {
return messageBeanList.size();
}
#Override
public Object getItem(int position) {
return messageBeanList.get(position);
}
#Override
public long getItemId(int position) {
return 0;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
ItemHolder itemHolder = new ItemHolder();
if (convertView == null) {
LayoutInflater vi = (LayoutInflater) activity.getSystemService(
Context.LAYOUT_INFLATER_SERVICE);
convertView = vi.inflate(
R.layout.message_item, null);
imageLoader=new ImageLoader(activity.getApplicationContext());
itemHolder.timestampp = (TextView) convertView
.findViewById(R.id.timestamp);
convertView.setTag(itemHolder);
} else {
itemHolder = (ItemHolder) convertView.getTag();
}
class ItemHolder
{
public TextView timestampp;
}
#Override
public void notifyDataSetChanged() {
super.notifyDataSetChanged();
// Your code to nofify
}
}
BEAN CLASS:
import com.google.gson.annotations.SerializedName;
public class MessageBean {
#SerializedName("date_created")
private String dateCreated = "";
}
public String getDateCreated() {
return dateCreated;
}
public void setDateCreated(String dateCreated) {
this.dateCreated = dateCreated;
}
Gone through almost every related question in SOF, but didn't get what I want as I am using bean and adapter class. Is this possible to convert Date and Time format if using JSON parsing?

I hope this will work for you..
Just add code in your adapter
/***************get current date time function*************/
String curDateTime = "";
Calendar c = Calendar.getInstance();
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
try{
String curDateTime = df.format(c.getTime());
}catch(Exception e){}
/***************get current date time function*************/
// add simple_date_format for uniqueness
SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
try {
Date date1 = simpleDateFormat.parse(messageBean.getDateCreated()); // like 2016-03-09 07:08:27
Date date2 = simpleDateFormat.parse(curDateTime); // 2016-03-09 07:08:27
differentDateTime = printDifference(date1, date2);
} catch (Exception e) {
e.printStackTrace();
}
itemHolder.timestampp.setText(differentDateTime);
/************function of print different for showing date into ago format***************/
//1 minute = 60 seconds
//1 hour = 60 x 60 = 3600
//1 day = 3600 x 24 = 86400
public String printDifference(Date startDate, Date endDate){
String allDaysMonsSeconds="";
//milliseconds
long different = endDate.getTime() - startDate.getTime();
Log.d("TAG","startDate : " + startDate);
Log.d("TAG","endDate : "+ endDate);
Log.d("TAG","different : " + different);
long secondsInMilli = 1000;
long minutesInMilli = secondsInMilli * 60;
long hoursInMilli = minutesInMilli * 60;
long daysInMilli = hoursInMilli * 24;
long yearInMilli = daysInMilli * 365;
long elapsedDays = different / daysInMilli;
different = different % daysInMilli;
long elapsedHours = different / hoursInMilli;
different = different % hoursInMilli;
long elapsedMinutes = different / minutesInMilli;
different = different % minutesInMilli;
long elapsedSeconds = different / secondsInMilli;
long elapsedYears = different / yearInMilli;
Log.d("TAG","%d days, %d hours, %d minutes, %d seconds %n, %d years:"+elapsedDays+","+elapsedHours+","+elapsedMinutes+","+elapsedSeconds+","+elapsedYears);
// code for showing before days...
if(elapsedDays<=0){
if (elapsedHours<=0)
{
if (elapsedMinutes<=0)
{
allDaysMonsSeconds = elapsedSeconds+" second ago";
}
else
{
allDaysMonsSeconds = elapsedMinutes+" minute ago";
}
}
else
{
allDaysMonsSeconds = elapsedHours+" hour ago";
}
}
else{
allDaysMonsSeconds = elapsedDays+" day ago";
}
return allDaysMonsSeconds;
}
/************function of print different for showing date into ago format***************/

try this,
initialize your textview first.
TextView t = new TextView();
Call below method as,
getTimeDifference(date, t);
private void getTimeDifference(String pDate, TextView time) {
int diffInDays = 0;
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
format.setTimeZone(TimeZone.getTimeZone("GMT"));
Calendar c = Calendar.getInstance();
String formattedDate = format.format(c.getTime());
Date d1 = null;
Date d2 = null;
try {
d1 = format.parse(formattedDate);
d2 = format.parse(pDate);
long diff = d1.getTime() - d2.getTime();
diffInDays = (int) (diff / (1000 * 60 * 60 * 24));
if (diffInDays > 0) {
if (diffInDays == 1) {
time.setText(diffInDays + " day ago");
} else {
time.setText(diffInDays + " days ago");
}
} else {
int diffHours = (int) (diff / (60 * 60 * 1000));
if (diffHours > 0) {
if (diffHours == 1) {
time.setText(diffHours + " hr ago");
} else {
time.setText(diffHours + " hrs ago");
}
} else {
int diffMinutes = (int) ((diff / (60 * 1000) % 60));
if (diffMinutes == 1) {
time.setText(diffMinutes + " min ago");
} else {
time.setText(diffMinutes + " mins ago");
}
}
}
} catch (ParseException e) {
// System.out.println("Err: " + e);
e.printStackTrace();
}
}

Use the following code and just concatenate ago as a string in the time:
startTime = "2016-03-09 16:23:30";
StringTokenizer tk = new StringTokenizer(startTime);
String date = tk.nextToken();
String time = tk.nextToken();
SimpleDateFormat sdf = new SimpleDateFormat("hh:mm:ss");
SimpleDateFormat sdfs = new SimpleDateFormat("hh:mm a");
Date dt;
try {
dt = sdf.parse(time);
System.out.println("Time Display: " + sdfs.format(dt)+" ago"); // <-- I got result here
} catch (ParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

String curDateTime = "";
Calendar c = Calendar.getInstance();
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
try{
String curDateTime = df.format(c.getTime());
}catch(Exception e){}
/***************get current date time function*************/
// add simple_date_format for uniqueness
SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
try {
Date date1 = simpleDateFormat.parse(messageBean.getDateCreated()); // like 2016-03-09 07:08:27
Date date2 = simpleDateFormat.parse(curDateTime); // 2016-03-09 07:08:27
differentDateTime = printDifference(date1, date2);
} catch (Exception e) {
e.printStackTrace();
}
itemHolder.timestampp.setText(differentDateTime);
/************function of print different for showing date into ago format***************/
//1 minute = 60 seconds
//1 hour = 60 x 60 = 3600
//1 day = 3600 x 24 = 86400
public String printDifference(Date startDate, Date endDate){
String allDaysMonsSeconds="";
//milliseconds
long different = endDate.getTime() - startDate.getTime();
Log.d("TAG","startDate : " + startDate);
Log.d("TAG","endDate : "+ endDate);
Log.d("TAG","different : " + different);
long secondsInMilli = 1000;
long minutesInMilli = secondsInMilli * 60;
long hoursInMilli = minutesInMilli * 60;
long daysInMilli = hoursInMilli * 24;
long yearInMilli = daysInMilli * 365;
long elapsedDays = different / daysInMilli;
different = different % daysInMilli;
long elapsedHours = different / hoursInMilli;
different = different % hoursInMilli;
long elapsedMinutes = different / minutesInMilli;
different = different % minutesInMilli;
long elapsedSeconds = different / secondsInMilli;
long elapsedYears = different / yearInMilli;
Log.d("TAG","%d days, %d hours, %d minutes, %d seconds %n, %d years:"+elapsedDays+","+elapsedHours+","+elapsedMinutes+","+elapsedSeconds+","+elapsedYears);
// code for showing before days...
if(elapsedDays<=0){
if (elapsedHours<=0)
{
if (elapsedMinutes<=0)
{
allDaysMonsSeconds = elapsedSeconds+" second ago";
}
else
{
allDaysMonsSeconds = elapsedMinutes+" minute ago";
}
}
else
{
allDaysMonsSeconds = elapsedHours+" hour ago";
}
}
else{
allDaysMonsSeconds = elapsedDays+" day ago";
}
return allDaysMonsSeconds;
}