Calculating Age using Java

To check the age from the given year.

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

public class AgeCalculation {

 /**
  * Month Representations
  */
 static final int JAN = 0;
 static final int FEB = 1;
 static final int MAR = 2;
 static final int APR = 3;
 static final int MAY = 4;
 static final int JUN = 5;
 static final int JUL = 6;
 static final int AUG = 7;
 static final int SEP = 8;
 static final int OCT = 9;
 static final int NOV = 10;
 static final int DEC = 11;

 public static void main(String[] args) {
  System.out.println("Born In 1982-JUL-11. Current Age: "
    + calculateMyAge(1982, JUL, 11));
  System.out.println("Born In 1957-DEC-09. Current Age: "
    + calculateMyAge(1957, DEC, 9));
 }

 /**
  *
  * @param year --> Birth Year
  * @param month --> Birth Month
  * @param day --> Birth Day
  * @return --> Calculated Age
  */
 private static int calculateMyAge(int year, int month, int day) {
  Calendar birthCal = new GregorianCalendar(year, month, day);

  Calendar nowCal = new GregorianCalendar();

  int age = nowCal.get(Calendar.YEAR) - birthCal.get(Calendar.YEAR);

  boolean isMonthGreater = birthCal.get(Calendar.MONTH) >= nowCal
    .get(Calendar.MONTH);

  boolean isMonthSameButDayGreater = birthCal.get(Calendar.MONTH) == nowCal
    .get(Calendar.MONTH)
    && birthCal.get(Calendar.DAY_OF_MONTH) > nowCal
    .get(Calendar.DAY_OF_MONTH);

    if (isMonthGreater || isMonthSameButDayGreater) {
     age=age-1;
    }
    return age;
 }

}

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Getting Timezone based Timestamp

It is used to find the Timestamp based on the given Timezone

//Creating format based on the need
SimpleDateFormat dateFormat = new SimpleDateFormat("dd/MM/yyyy HH:mm:ss");
//Set the Timezone 
dateFormat.setTimeZone(clientTimeZone);
String clientTime = dateFormat.format(date);
Date date2 = new Date(clientTime);
//
System.out.println(date2);

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To display System date and time

This Program will helps to know the current system date and time.

import java.util.*;

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

  Calendar cl=Calendar.getInstance();

  //display date separately
  System.out.print("Current date: ");
  int dd=cl.get(Calendar.DATE);
  int mm=cl.get(Calendar.MONTH);
  ++mm;
  int yy=cl.get(Calendar.YEAR);
  System.out.println(dd+ "-" + mm + "-" +yy);

  //display time alone

  System.out.print("Current time: ");
  int h=cl.get(Calendar.HOUR);
  int m=cl.get(Calendar.MINUTE);
  int s=cl.get(Calendar.SECOND);
  System.out.println(h+ ";" + m + ";" +s);

  int x=cl.get(Calendar.AM_PM);
  if(x==0) System.out.println("Good Morning");
  else System.out.println("Good Evening");

 }

}

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