Date and Time Functions in Java

Java provides the Date class available in java.util package, this class encapsulates the current date and time. Java Dates are LocalDate, Represents a date (year, month, day (yyyy-MM-dd)). Java Time are LocalTime, Represents a time (hour, minute, second and nanoseconds (HH-mm-ss-ns)). Calendar class in Java is an abstract class that provides methods for converting date between a specific instant in time and a set of calendar fields such as MONTH, YEAR, HOUR, etc

Source Code

import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
 
@SuppressWarnings("ALL")
public class DataTimeDemo {
    public static void main(String[] args) {
 
        System.out.println(System.currentTimeMillis());
        long year=(System.currentTimeMillis()/1000/60/60/24/365);
        System.out.println(year);
        //System.out.println(Long.MAX_VALUE);
        //System.out.println((Long.MAX_VALUE/1000/60/60/24/365));
        //Date d =new Date(System.currentTimeMillis());
        //Java 8
        Date d =new Date();//MM-DD-YYYY
        System.out.println(d);
        System.out.println("Date    : "+d.getDate());
        System.out.println("Day     : "+d.getDay()); //0 Sunday to 7-Saturday
        System.out.println("Month   : "+d.getMonth());//0 Jan to 11 Dec
        System.out.println("Year    : "+(d.getYear()+1900));
        System.out.println("Time    : "+d.getTime());
        System.out.println("Hours   : "+d.getHours());
        System.out.println("Minutes : "+d.getMinutes());
        System.out.println("Seconds : "+d.getSeconds());
 
 
        GregorianCalendar o =new GregorianCalendar();
        //System.out.println(o);
        System.out.println(o.isLeapYear(2020));
        System.out.println("Date  : "+o.get(Calendar.DATE));
        System.out.println("Month : "+o.get(Calendar.MONTH));
        System.out.println("Year  : "+o.get(Calendar.YEAR));
        System.out.println("Day of Week  : "+o.get(Calendar.DAY_OF_WEEK)); //1-Sun to 7-Sat
        System.out.println("Day of Year  : "+o.get(Calendar.DAY_OF_YEAR));
 
    }
}
 

Output

1647422013418
52
Wed Mar 16 14:43:33 IST 2022
Date    : 16
Day     : 3
Month   : 2
Year    : 2022
Time    : 1647422013422
Hours   : 14
Minutes : 43
Seconds : 33
true
Date  : 16
Month : 2
Year  : 2022
Day of Week  : 4
Day of Year  : 75
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