Date Operation in Java

Date Operation in java

There are two essential factor in any programing language that is DATE and TIME.I am trying to cover all date/time operation that is really essential for implementing many concepts at real-time. I am just covering the following function for the date operation, rest will i cover in my next blog.

• Returns current date for the current Locale
• Long representing the current date of the current Locale
• String representing the current Date of the current Locale
• Prints name of the month
• Medium date for the locale
• Short date for the locale
• Long date for the locale
• Full date for the locale
• Get year represented by date is leap or not
• Get year is leap year or not
• Get date form String with given pattern and date in string
• Get next month of the month in the date
• Get next month of the current month
• Get current month
• Get previous year
• Get Next Year
• Get year form the date
• Get current year
• Get string representation of a date in pattern given by pattern
• Get date in MM/dd/yyyy format
• Current date in pattern given by pattern

Java is also provides a very special class – DATE .It is contains inside the java.util package.Now i am describing it to step by step to get better understanding in DATE operation.

Returns current date for the current Locale

import java.text.DateFormat;

import java.util.Date;

import java.util.Locale;

 

public class AOIDateOperation {

 public Date getCurrentDate() {

 return new Date();

 }

 public static void main(String[] args) {

 AOIDateOperation aoiDate = new AOIDateOperation();

 Date currentDateLocale = aoiDate.getCurrentDate();

 System.out.println("Current date for the current Locale "+currentDateLocale);

 }

}

 Long representing the current date of the current Locale

import java.text.DateFormat;

import java.util.Date;

import java.util.Locale;

 

public class AOIDateOperation {

 public long getCurrentDateAsLong() {

 return new Date().getTime();

 }

 public static void main(String[] args) {

 AOIDateOperation aoiDate = new AOIDateOperation();

 long dateInLong = aoiDate.getCurrentDateAsLong();

 System.out.println("Long representing the current date of the current Locale "+dateInLong);

 }

}

 String representing the current Date of the current Locale

public class AOIDateOperation {

 public String getCurrentDateAsString() {

 return new Date().toString();

 }

 public static void main(String[] args) {

 AOIDateOperation aoiDate = new AOIDateOperation();

 String dateInString = aoiDate.getCurrentDateAsString();

 System.out.println("String representing the current date of the current Locale "+dateInString);

 }

}

 Prints name of the month

import java.text.DateFormat;

import java.util.Date;

import java.util.Locale;

 

public class AOIDateOperation {

 public String printMonth(int monthIndex) {

 final String[] months = {

 "January", "February", "March",

 "April", "May", "June",

 "July", "August", "September",

 "October", "November", "December"

 };

 return months[monthIndex-1];

 }

 public static void main(String[] args) {

 AOIDateOperation aoiDate = new AOIDateOperation();

 String nameOftheMonth = aoiDate.printMonth(1);

 System.out.println("Prints name of the month "+nameOftheMonth);

 }

} 

 

Meduim date for the locale
Suppose if you have a requirement to show the locale date format to the user.
Means if user is access your application from any other country so date format should be locale for that particular area.

 Locale                                format

Locale.ENGLISH          Apr 8, 2011
Locale.CHINA              2011-4-8
Locale.CHINA             08.04.2011

import java.text.DateFormat;

import java.util.Date;

import java.util.Locale;

 

public class AOIDateOperation {

 

 public String getMediumDateByLocale(Locale locale) {

 return DateFormat.getDateInstance(DateFormat.MEDIUM, locale).format(new Date());

 }

 

 public static void main(String[] args) {

 AOIDateOperation aoiDate = new AOIDateOperation();

 String mediumDate = aoiDate.getMediumDateByLocale(Locale.ENGLISH);

 System.out.println("Meduim date for the locale "+mediumDate);

 }

}

 Short date for the locale

import java.text.DateFormat;

import java.util.Date;

import java.util.Locale;

 

public class AOIDateOperation {

 

 /**

 * This methods gives short date for the locale

 * @param locale a Locale

 * @return  String on success,null otherwise

 */

 public  String getShortDateByLocale(Locale locale) {

 return DateFormat.getDateInstance(DateFormat.SHORT, locale).format(new Date());

 }

 

 public static void main(String[] args) {

 AOIDateOperation aoiDate = new AOIDateOperation();

 String shortDate=aoiDate.getShortDateByLocale(Locale.ENGLISH);

 System.out.println("short date for the locale "+shortDate);

 }

}

 

 Long date for the locale 

import java.text.DateFormat;

import java.util.Date;

import java.util.Locale;

 

public class AOIDateOperation {

 

 public String getLongDateByLocale(Locale locale) {

 return DateFormat.getDateInstance(DateFormat.LONG, locale).format(new Date());

 }

 

 public static void main(String[] args) {

 AOIDateOperation aoiDate = new AOIDateOperation();

 String longDate=aoiDate.getLongDateByLocale(Locale.ENGLISH);

 System.out.println("Long date for the locale "+longDate);

 }

}

 Full date for the locale

import java.text.DateFormat;

import java.util.Date;

import java.util.Locale;

public class AOIDateOperation {

 public  String getFullDateByLocale(Locale locale) {

 return DateFormat.getDateInstance(DateFormat.FULL, locale).format(new Date());

 }

 public static void main(String[] args) {

 AOIDateOperation aoiDate = new AOIDateOperation();

 String fullDate=aoiDate.getFullDateByLocale(Locale.ENGLISH);

 System.out.println("Full date for the locale "+fullDate);

 }

}

 Current date in pattern given by pattern

import java.text.SimpleDateFormat;

import java.util.Date;

public class AOIDateOperation {

 public  String getCurrentDateByPattern(String pattern) {

 return new SimpleDateFormat(pattern).format(new Date());

 }

 public static void main(String[] args) {

 AOIDateOperation aoiDate = new AOIDateOperation();

 String patternDate=aoiDate.getCurrentDateByPattern("MM/dd/yyyy");

 System.out.println("Current date in pattern given by pattern "+patternDate);

 }

}

 Get date in MM/dd/yyyy format

import java.text.SimpleDateFormat; 

import java.util.Date;

public class AOIDateOperation {

 public String getDateInMMDDYYYY(Date date) {

 return new SimpleDateFormat("MM/dd/yyyy").format(date);

 }

 public static void main(String[] args) {

 AOIDateOperation aoiDate = new AOIDateOperation();

 String patternDate=aoiDate.getDateInMMDDYYYY(new Date());

 System.out.println("Gives date in MM/dd/yyyy format"+patternDate);

 }

}

 Get string representation of a date in pattern given by pattern

import java.text.SimpleDateFormat;

import java.util.Date;

 

public class AOIDateOperation {

 public String getDateToStringByPattern(String pattern, Date date) {

 return new SimpleDateFormat(pattern).format(date);

 }

 public static void main(String[] args) {

 AOIDateOperation aoiDate = new AOIDateOperation();

 String patternStringDate=aoiDate.getDateToStringByPattern("MM/dd/yyyy",new Date());

 System.out.println("string representation of a date in pattern given by pattern "+patternStringDate);

 }

}

 Get current year

import java.util.Calendar;

import java.util.GregorianCalendar;

public class AOIDateOperation {

 public Integer getYear() {

 return new GregorianCalendar().get(Calendar.YEAR);

 }

 public static void main(String[] args) {

 AOIDateOperation aoiDate = new AOIDateOperation();

 Integer currentYear=aoiDate.getYear();

 System.out.println("string representation of a date in pattern given by pattern "+currentYear);

 }

}

 Get year form the date

import java.util.Calendar;

import java.util.Date;

import java.util.GregorianCalendar;

public class AOIDateOperation {

 public Integer getYear(Date date) {

 GregorianCalendar gCal = new GregorianCalendar();

 gCal.setTime(date);

 return gCal.get(Calendar.YEAR);

 }

 public static void main(String[] args) {

 AOIDateOperation aoiDate = new AOIDateOperation();

 Integer currentYearFromGivenDate=aoiDate.getYear(new Date());

 System.out.println("gives year form the date "+currentYearFromGivenDate);

 }

}

 

 Get Next Year

import java.util.Calendar;

import java.util.GregorianCalendar;

public class AOIDateOperation {

 public Integer getNextYear() {

 return new GregorianCalendar().get(Calendar.YEAR)+1;

 }

 public static void main(String[] args) {

 AOIDateOperation aoiDate = new AOIDateOperation();

 Integer nextYear=aoiDate.getNextYear();

 System.out.println("Returns next year "+nextYear);

 }

}

 

 Get previous year

import java.util.Calendar;

import java.util.GregorianCalendar;

public class AOIDateOperation {

 public Integer getPreviousYear() {

 return new GregorianCalendar().get(Calendar.YEAR)-1;

 }

 public static void main(String[] args) {

 AOIDateOperation aoiDate = new AOIDateOperation();

 Integer previousYear=aoiDate.getPreviousYear();

 System.out.println("Returns previous year "+previousYear);

 }

}

 Get current month

import java.util.Calendar;

import java.util.GregorianCalendar;

public class AOIDateOperation {

 public Integer getMonth() {

 return new GregorianCalendar().get(Calendar.MONTH)+1;

 }

 public static void main(String[] args) {

 AOIDateOperation aoiDate = new AOIDateOperation();

 Integer month=aoiDate.getMonth();

 System.out.println("Returns current Month "+month);

 }

}

 Get next month of the current month

public class AOIDateOperation {

 public Integer getNextMonth() {

 return new GregorianCalendar().get(Calendar.MONTH) == Calendar.DECEMBER ? 1 : new GregorianCalendar().get(Calendar.MONTH) + 2;

 }

 public static void main(String[] args) {

 AOIDateOperation aoiDate = new AOIDateOperation();

 Integer nextMonth=aoiDate.getNextMonth();

 System.out.println("Returns Next Month "+nextMonth);

 }

}

 Get next month of the month in the date

public class AOIDateOperation {

 public Integer getNextMonth(Date date) {

 GregorianCalendar cal = new GregorianCalendar();

 cal.setTime(date);

 return cal.get(Calendar.MONTH) == Calendar.DECEMBER ? 1 : cal.get(Calendar.MONTH) + 2;

 }

 public static void main(String[] args) {

 AOIDateOperation aoiDate = new AOIDateOperation();

 Integer nextMonth=aoiDate.getNextMonth(new Date());

 System.out.println("Returns Next to Next Month "+nextMonth);

 }

}

 Get date form String with given pattern and date in string

import java.text.ParseException;

import java.text.SimpleDateFormat;

import java.util.Calendar;

import java.util.Date;

import java.util.GregorianCalendar;

 

public class AOIDateOperation {

 public  Integer getNextMonth(String pattern, String dateStr) {

 return getNextMonth(convertStringToDate(pattern, dateStr));

 }

 

 public static void main(String[] args) {

 AOIDateOperation aoiDate = new AOIDateOperation();

 Integer nextYear=aoiDate.getNextMonth("MM/dd/yyyy","12/01/2010");

 System.out.println("Returns date form String with given pattern and date in string "+nextYear);

 }

 

 public static Date convertStringToDate(String pattern, String dateStr) {

 

 try {

 return new SimpleDateFormat(pattern).parse(dateStr);

 } catch (ParseException e) {

 }

 return null;

 }

 

 public Integer getNextMonth(Date date) {

 GregorianCalendar cal = new GregorianCalendar();

 cal.setTime(date);

 return cal.get(Calendar.MONTH) == Calendar.DECEMBER ? 1 : cal.get(Calendar.MONTH) + 2;

 }

}

 Get year is leap year or not

import java.util.GregorianCalendar;

public class AOIDateOperation {

 public boolean isLeapYear(int year) {

 return new GregorianCalendar().isLeapYear(year);

 }

 public static void main(String[] args) {

 AOIDateOperation aoiDate = new AOIDateOperation();

 boolean leapYear = aoiDate.isLeapYear(2010);

 System.out.println("Is Leap Year ??? " + leapYear);

 }

}

Get year represented by date is leap or not

import java.util.Calendar;

import java.util.Date;

import java.util.GregorianCalendar;

 

public class AOIDateOperation {

 

 public  boolean isLeapYear(Date date) {

 return isLeapYear(getYear(date));

 }

 

 public static void main(String[] args) {

 AOIDateOperation aoiDate = new AOIDateOperation();

 boolean leapYear = aoiDate.isLeapYear(new Date());

 System.out.println("Is Leap Year" + leapYear);

 }

 

 public Integer getYear(Date date) {

 GregorianCalendar gCal = new GregorianCalendar();

 gCal.setTime(date);

 return gCal.get(Calendar.YEAR);

 }

 

 public boolean isLeapYear(int year) {

 return new GregorianCalendar().isLeapYear(year);

 }

}

If you have any question so please free feel to ask.