java- difference between 2 different times in 2 different days

Question

I want to write a program which shows the time remained from right now to a specific time in a date in future. as I want to use Joda-TimeI searched alot and found some codes(e.g. this one) but I dont know how to do that for 2 different times in 2 different days. any idea?

Answer 1

You mean something like...

DateTime from = new DateTime(2014, DateTimeConstants.FEBRUARY, 15, 8, 51, 30, 100);
DateTime to = new DateTime(2016, DateTimeConstants.DECEMBER, 25, 17, 01, 51, 50);

Interval i = new Interval(from, to);
Period p = i.toPeriod(PeriodType.yearMonthDayTime());

System.out.println(p.getYears() + " years");
System.out.println(p.getMonths() + " months");
System.out.println(p.getDays() + " days");
System.out.println(p.getHours() + " hours");
System.out.println(p.getSeconds() + " seconds");
System.out.println(p.getMillis() + " millis");

Which outputs

2 years
10 months
10 days
8 hours
20 seconds
950 millis

Now using...

DateTime from = new DateTime();
DateTime to = new DateTime(2015, 3, 21, 2, 15, 10);

instead, prints...

0 years
0 months
7 days
15 hours
26 seconds
755 millis

Answer 2

package com.test;

import java.util.Calendar;

import org.joda.time.Duration;

public class Main {

public Main() {
}

public static void main(String[] args) {
    Calendar calendar1 = Calendar.getInstance();
    Calendar calendar2 = Calendar.getInstance();

    calendar1.add(Calendar.DAY_OF_YEAR, 1);
    calendar1.add(Calendar.HOUR_OF_DAY, 2);
    calendar1.add(Calendar.MINUTE, 10);

    Duration duration = new Duration(calendar2.getTimeInMillis(), calendar1.getTimeInMillis());
    System.out.println(duration.getMillis());
    System.out.println(duration.getStandardDays());
    System.out.println(duration.getStandardMinutes());
    System.out.println(duration.getStandardHours());
    System.out.println(duration.getStandardSeconds());
}

}

I think this might be helpful for you.

This code will give exact same durations. You need to set the calendar2 to a fixed date in future to get your desired result.

Update 1

You can have it like this for example for a fixed date in future. There can be other better ways to achieve same.

package com.test;

import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;

import org.joda.time.Duration;

public class Main {

public Main() {
}

public static void main(String[] args) throws ParseException {
    Calendar calendar1 = Calendar.getInstance();

    DateFormat df = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss");

    Date date1 = calendar1.getTime();
    Date date2 = df.parse("2015/03/20 10:30:00");


    Duration duration = new Duration(date1.getTime(), date2.getTime());
    long millis = duration.getMillis();
    long days = duration.getStandardDays();
    long mins = duration.getStandardMinutes();
    long hrs = duration.getStandardHours();
    long secs = duration.getStandardSeconds();

    System.out.println(days + ":" + (hrs % 24) + ":" + (mins%60) + ":" + (secs%(mins)) + " remaining");
}

}

Answer 3

You mentioned that you want to use Joda-time, so one of the other solutions may be better for you.

However, this same process can now also be done quite easily using Java 8's native Time library as follows:

public class Main {

    public static void main() {
        Instant then = Instant.EPOCH;  //1970-01-01T00:00:00Z
        Instant now = Instant.now(); //The current "instant" in time

        Duration duration = Duration.between(then, now);

        //Outputs the days, hours, minutes, and seconds between the epoch start and now.
        System.out.println(duration.getDays());
        System.out.println(duration.getHours());
        System.out.println(duration.getMinutes());
        System.out.println(duration.getSeconds());

        //If you want to account for having already displayed days 
        //when showing your hours, and so on down the units, do this:
        System.out.println(duration.getDays());
        duration = duration.minusDays(duration.getDays());

        System.out.println(duration.getHours());
        duration = duration.minusHours(duration.getHours());

        System.out.println(duration.getMinutes());
        duration = duration.minusMinutes(duration.getMinutes());

        System.out.println(duration.getSeconds());
    }

}

Check out the full package documentation here: http://docs.oracle.com/javase/8/docs/api/java/time/package-summary.html