How to compute your age in JAVA?

     Calendar and Date are often used when we are dealing with time/date. They are subclasses under java.util class.Date use for date storing while Calendar usually use for manipulating.
 // first import Calendar

    import java.util.Calendar;

                     public class HowYoungAreYou{
                     public static void main(String[]args){

                      //set current time and date,ngayon!kung anong date sa PC 
                     Calendar now=Calendar.getInstance();

                      //set yung birthdate mo
                      Calendar before=Calendar.getInstance();
                   
                      //halimbawa birthdate mo ay July 25,2000
                        before.set(2000,6,25);

/* month is an array,
    and array start with 0-January,1-Febuary
    therefore 2000,6,25 is July 25 2000*/

                       //convert time in milliseconds
                       //declare nowmillis and beforemillis in "long" integer
                       long nowmillis=now.getTimeInMillis();
                       long beforemillis=before.getTimeInMillis();

                       //find the difference of date in milliseconds
                       //declare also timemillis as "long" integer
                         long timemillis=nowmillis-beforemillis;
                    
                        //compute/convert millisecond in to days
                        long days=timemillis/(24 * 60 * 60 * 1000);
                        //1000ms in a second,60 in a minute,60minute in an hour and 24hours in a day

                       //then days to years,365days in a year, declare in  double for decimal decimal
                         double year=(double) (days/365d);
                   System.out.println("You are"+year+"year(s) old right now!);
    }
            
}/Done

Output:
You are 11.70958904109589 year(s) old right now!

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