Java Date time pro

Add or subtract years to current date

import java.util.Calendar;

public class AddYearToCurrentDate

{

public static void main(String[] args)

{

Calendar now = Calendar.getInstance();

System.out.println("Current date : " + (now.get(Calendar.Month) + 1)

+ "-"

+ now.get(Calendar.Date)

+ "-"

+ now.get(Calendar.Year));

                   

now.add(Calendar.Year,1);

System.out.println("date after one year:"+(now.get(Calendar.Month) + 1)

+ "-"

+ now.get(Calendar.Date)

+ "-"

+ now.get(Calendar.Year));

now =Calendar.getInstance();

now.add(Calendar.Year,-100);

       System.out.println("date before 100 years:"+(now.get(Calendar.Month) + 1)

+ "-"

+ now.get(Calendar.Date)

+ "-"

+ now.get(Calendar.Year));

  }

}

Compare date time using after method

import java.util.Calendar;

public class CompareDateTimesUsingAfter

 {

public static void main(String[] args)

{

Calendar futureCal = Calendar.getInstance();

futureCal.set(Calendar.Year, 2010);

Calendar now = Calendar.getInstance();

System.out.println("Current date : " + (now.get(Calendar.Month) + 1)

+ "-"

+ now.get(Calendar.Date)

+ "-"

+ now.get(Calendar.Year));

System.out.println("Is futureCal after now ? : " + futureCal.after(now));

   }

}

Compare date time using before method

import java.util.Calendar;

public class CompareDateTimesUsingBefore

{

public static void main(String[] args)

{

Calendar old = Calendar.getInstance(); old.set(Calendar.Year, 1990);Calendar now = Calendar.getInstance();

System.out.println("Is old before now ? : " + old.before(now));

   }

}

Display Day of Week

import java.util.Calendar;

public class DisplayDayOfWeek

{

public static void main(String[] args)

{

Calendar now = Calendar.getInstance();

System.out.println("Current date : " + (now.get(Calendar.Month) + 1)

+ "-"

+ now.get(Calendar.Date)

+ "-"

+ now.get(Calendar.Year));

String[] strDays = new String[]

{

"Sunday",

"Monday",

"Tuesday",

"Wednesday",

"Thusday",

"Friday",

"Saturday"

};

System.out.println("Current day is : " +

strDays[now.get(Calendar.Day_Of_Week) - 1]

   );

  }

 }

Display Month of year

import java.util.Calendar;

public class DisplayMonthOfYear

{

public static void main(String[] args)

{

Calendar now = Calendar.getInstance();

System.out.println("Current date : " + (now.get(Calendar.Month) + 1)

+ "-"

+ now.get(Calendar.Date)

+ "-"

+ now.get(Calendar.Year));

String[] strMonths = new String[]

{

"Jan",

"Feb",

"Mar",

"Apr",

"May",

"Jun",

"Jul",

"Aug",

"Sep",

"Oct",

"Nov",

"Dec"

};

System.out.println("Current month is : " + strMonths[now.get(Calendar.Month)]

  );

 }

}