In this java program, we will learn about how to calculate the difference between two time periods.
Given two time instants in HH:mm:ss format, we have to print the difference between these two time periods in hours, minutes and seconds as follows:
Time1: 02:10:00 Time2: 04:20:00 Difference : 2 hours, 10 minutes, 0 seconds
Here is the algorithm to calculate the difference between two time periods.
- Create an object of SimpleDateFormat class by using the string format "HH:mm:ss".
- Parse time1 and time2 time as string to get the corresponding date objects by using parse() method of the simpleDateFormat class.
- Calculate the time difference between two date objects in milliseconds by using getTime() method.
- Now, convert the time difference in milliseconds to hours, minutes and seconds.
- Print the time difference in screen.
Java Program to Calculate Difference Between Two Time Periods
import java.text.SimpleDateFormat;
import java.util.Date;
public class TimeDifference {
public static void main(String[] args) throws Exception {
String time1 = "02:10:00";
String time2 = "04:20:00";
SimpleDateFormat format = new SimpleDateFormat("HH:mm:ss");
Date date1 = format.parse(time1);
Date date2 = format.parse(time2);
// Difference in Milliseconds
long diffInMs = date2.getTime() - date1.getTime();
long diffSeconds = diffInMs / 1000 % 60;
long diffMinutes = diffInMs / (60 * 1000) % 60;
long diffHours = diffInMs / (60 * 60 * 1000) % 24;
System.out.format("Difference : %d hours, %d minutes, %d seconds",
diffHours, diffMinutes, diffSeconds);
}
}
Output
Difference : 2 hours, 10 minutes, 0 seconds
