Chapter 3 Exercise 30, Introduction to Java Programming, Tenth Edition Y. Daniel LiangY.

*3.30 (Current time) Revise Programming Exercise 2.8 to display the hour using a 12-hour clock. Here is a sample run:
Enter the time zone offset to GMT: -5
The current time is 4:50:34 AM

import java.util.Scanner;
 
public class ProgrammingEx3_30 {
 
 public static void main(String[] args) {
 
  Scanner input = new Scanner(System.in);
  System.out.print("Enter the time zone offset to GMT:");
  int offset = input.nextInt();
  // calculate offset in seconds
  offset = offset * 60 * 60;
 
  // Obtain the total milliseconds since midnight, Jan 1, 1970
  long totalMilliseconds = System.currentTimeMillis();
 
  // Obtain the total seconds since midnight, Jan 1, 1970 and apply the
  // offset
  long totalSeconds = (totalMilliseconds / 1000) + offset;
 
  // Compute the current second in the minute in the hour
  long currentSecond = totalSeconds % 60;
 
  // Obtain the total minutes
  long totalMinutes = totalSeconds / 60;
 
  // Compute the current minute in the hour
  long currentMinute = totalMinutes % 60;
 
  // Obtain the total hours
  long totalHours = totalMinutes / 60;
 
  // Compute the current hour
  long currentHour = totalHours % 24;
 
  String s = " AM";
  if (currentHour >= 12) {
   s = " PM";
  }
  if (currentHour >= 13) {
   currentHour = currentHour - 12;
  }
 
  if (currentHour == 0) {
   currentHour = currentHour + 12;
  }
 
  // Display results
  System.out.println("Current time is " + currentHour + ":"
    + currentMinute + ":" + currentSecond + s);
 }
 
}