Java Date and Time

In Java, the java.util.Date class represents a specific moment in time, and the java.util.Calendar class provides methods for manipulating and formatting dates and times.

Here is an example of how to use the Date and Calendar classes to work with dates and times in Java:

import java.util.Calendar;
import java.util.Date;
import java.util.TimeZone;

public class Main {
  public static void main(String[] args) {
    // Get the current date and time
    Date now = new Date();
    System.out.println("Current date and time: " + now);  // Output: current date and time

    // Create a Calendar instance
    Calendar cal = Calendar.getInstance();

    // Set the Calendar to the current date and time
    cal.setTime(now);

    // Get the year, month, and day from the Calendar
    int year = cal.get(Calendar.YEAR);
    int month = cal.get(Calendar.MONTH);
    int day = cal.get(Calendar.DAY_OF_MONTH);
    System.out.println("Year: " + year);  // Output: current year
    System.out.println("Month: " + month);  // Output: current month (0-based)
    System.out.println("Day: " + day);  // Output: current day of month

    // Get the hour, minute, and second from the Calendar
    int hour = cal.get(Calendar.HOUR_OF_DAY);
    int minute = cal.get(Calendar.MINUTE);
    int second = cal.get(Calendar.SECOND);
    System.out.println("Hour: " + hour);  // Output: current hour (24-hour format)
    System.out.println("Minute: " + minute);  // Output: current minute
    
}
}