package in.bench.resources.java8.localtime.examples;

import java.time.Duration;
import java.time.LocalTime;

public class FindDifferenceOfTwoLocalTime {

	public static void main(String[] args) {

		// 1. office start time
		LocalTime startsTime = LocalTime.of(8, 29, 15, 723);
		System.out.println("Office start Time is :- \n" + startsTime);


		// 2. office end time
		LocalTime endsTime = LocalTime.of(17, 31, 59, 999);
		System.out.println("\nOffice end Time is :- \n" + endsTime);


		// 3. difference between 2 LocalTime - Time duration spent in Office
		Duration duration = Duration.between(startsTime, endsTime);
		System.out.println("\nTime Duration between 2 LocalTime is :- \n" + duration);


		// 3.1 get difference in nanos/seconds
		int nanos = duration.getNano();
		long seconds = duration.getSeconds();


		// 3.2 Time spent in Seconds & Nanoseconds
		System.out.println("\nTime Duration spent in Office is :- \n"
				+ seconds + " Seconds "
				+ nanos + " Nanos");


		// 3.3 Number of hours within Duration leaving Minutes/Millis/Nanos
		System.out.println("\nNumber of hours within Duration leaving Minutes/Millis/Nanos :- \n"
				+ duration.toHours());


		// 3.4 Number of minutes within Duration leaving Millis/Nanos
		System.out.println("\nNumber of minutes within Duration leaving Millis/Nanos :- \n"
				+ duration.toMinutes());


		// 3.5 Number of Millis within Duration leaving Nanos
		System.out.println("\nNumber of millis within Duration leaving Nanos :- \n"
				+ duration.toMillis());


		// 3.5 Number of Nanos within Duration
		System.out.print("\nNumber of nanos within Duration :- \n"
				+ duration.toNanos());
	}
}

Office start Time is :- 
08:29:15.000000723

Office end Time is :- 
17:31:59.000000999

Time Duration between 2 LocalTime is :- 
PT9H2M44.000000276S

Time Duration spent in Office is :- 
32564 Seconds 276 Nanos

Number of hours within Duration leaving Minutes/Millis/Nanos :- 
9

Number of minutes within Duration leaving Millis/Nanos :- 
542

Number of millis within Duration leaving Nanos :- 
32564000

Number of nanos within Duration :- 
32564000000276

package in.bench.resources.java8.localtime.examples;

import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;

public class FindDifferenceOfTwoCalendarDateTime {

	public static void main(String[] args) {

		// 1. office start time - Instantiate GregorianCalendar
		Calendar calendar1 = new GregorianCalendar(2022, 7, 7, 9, 29, 15); // 7-August
		Date date1 = calendar1.getTime();
		System.out.println("Office start Time is :- \n" + date1);


		// 2. office end time - Instantiate GregorianCalendar
		Calendar calendar2 = new GregorianCalendar(2022, 7, 7, 17, 31, 29); // 7-August
		Date date2 = calendar2.getTime();
		System.out.println("\nOffice end Time is :- \n" + date2);


		// 3. difference between 2 Date - time duration spent in an Office
		long differenceInMillis = date2.getTime() - date1.getTime();
		System.out.println("\nDifference in Milliseconds is :- \n" + differenceInMillis);


		// 3.1 get difference of years/days/hours/minutes/seconds
		long years = (differenceInMillis / (365 * 24 * 60 * 60 * 1000L)); 
		long days = (differenceInMillis / (24 * 60 * 60 * 1000L)) % 365;
		long hours = (differenceInMillis / (60 * 60 * 1000L)) % 24;
		long minutes = (differenceInMillis / (60 * 1000L)) % 60;
		long seconds = (differenceInMillis / 1000) % 60;   


		// 3.2 print to console
		System.out.print("\nTime Duration spent in an Office is :- \n"
				+ years + " Years " 
				+ days + " Days "
				+ hours + " Hours " 
				+ minutes + " Minutes "
				+ seconds + " Seconds"
				);
	}
}

Office start Time is :- 
Sun Aug 07 09:29:15 IST 2022

Office end Time is :- 
Sun Aug 07 17:31:29 IST 2022

Difference in Milliseconds is :- 
28934000

Time Duration spent in an Office is :- 
0 Years 0 Days 8 Hours 2 Minutes 14 Seconds