Java Date Time API In JAVA 8

Hi Guys, In this post I'll share java 8 Feature for Java NEw Date and Time API.
In Java 8 Sun's added new feature i.e. Java Date Time API.

New date-time API is introduced in Java 8 to overcome the following drawbacks of old date-time API :
Not thread safe : Unlike old java.util.Date which is not thread safe the new date-time API is immutable and doesn’t have setter methods.
Less operations : In old API there are only few date operations but the new API provides us with many date operations.
Java 8 under the package java.time introduced a new date-time API, most important classes among them are :
Local : Simplified date-time API with no complexity of timezone handling.
Zoned : Specialized date-time API to deal with various timezones.
LocalDate/LocatTime and LocalDateTime API : Use it when time zones are NOT required.
// Java code for LocalDate
// / LocalTime Function
import java.time.*;
import java.time.format.DateTimeFormatter;
 
public class Date {
 
public static void LocalDateTimeApi()
{
 
    // the current date
    LocalDate date = LocalDate.now();
    System.out.println("the current date is "+
                        date);
 
 
    // the current time
    LocalTime time = LocalTime.now();
    System.out.println("the current time is "+
                        time);
     
 
    // will give us the current time and date
    LocalDateTime current = LocalDateTime.now();
    System.out.println("current date and time : "+
                        current);
 
 
    // to print in a particular format
    DateTimeFormatter format = 
      DateTimeFormatter.ofPattern("dd-MM-yyyy HH:mm:ss"); 
   
    String formatedDateTime = current.format(format); 
   
    System.out.println("in foramatted manner "+
                        formatedDateTime);
 
 
    // printing months days and seconds
    Month month = current.getMonth();
    int day = current.getDayOfMonth();
    int seconds = current.getSecond();
    System.out.println("Month : "+month+" day : "+
                        day+" seconds : "+seconds);
 
    // printing some specified date
    LocalDate date2 = LocalDate.of(1950,1,26);
    System.out.println("the repulic day :"+date2);
 
    // printing date with current time.
    LocalDateTime specificDate = 
        current.withDayOfMonth(24).withYear(2016);
 
    System.out.println("specfic date with "+
                       "current time : "+specificDate);
}
 
    // Driver code
    public static void main(String[] args) 
    {
        LocalDateTimeApi();
    }
}
Output:
the current date is 2018-04-09
the current time is 06:21:10.409
current date and time : 2018-04-09T06:21:10.410
in foramatted manner 09-04-2018 06:21:10
Month : APRIL day : 9 seconds : 10
the repulic day :1950-01-26
specfic date with current time : 2016-04-24T06:21:10.410
Zoned date-time API : Use it when time zones are to be considered
// Java code for Zoned date-time API
import java.time.LocalDateTime;
import java.time.ZoneId;
import java.time.ZonedDateTime;
import java.time.format.DateTimeFormatter;
 
public class Zone {
 
// Function to get Zoned Date and Time
public static void ZonedTimeAndDate()
{
    LocalDateTime date = LocalDateTime.now();
    DateTimeFormatter format1 = 
      DateTimeFormatter.ofPattern("dd-MM-yyyy HH:mm:ss"); 
     
    String formattedCurrentDate = date.format(format1);
     
    System.out.println("formatted current Date and"+
                      " Time : "+formattedCurrentDate); 
 
    // to get the current zone
    ZonedDateTime currentZone = ZonedDateTime.now(); 
    System.out.println("the current zone is "+
                        currentZone.getZone()); 
 
    // getting time zone of specific place
    // we use withZoneSameInstant(): it is
    // used to return a copy of this date-time 
    // with a different time-zone, 
    // retaining the instant.
    ZoneId tokyo = ZoneId.of("Asia/Tokyo");
 
    ZonedDateTime tokyoZone =
            currentZone.withZoneSameInstant(tokyo);
                   
    System.out.println("tokyo time zone is " + 
                        tokyoZone);
 
    DateTimeFormatter format = 
        DateTimeFormatter.ofPattern("dd-MM-yyyy HH:mm:ss"); 
     
    String formatedDateTime = tokyoZone.format(format); 
 
    System.out.println("formatted tokyo time zone "+
                        formatedDateTime);
     
}
     
    // Driver code
    public static void main(String[] args) 
    {
         
        ZonedTimeAndDate();
         
    }
}
Output:
formatted current Date and Time : 09-04-2018 06:21:13
the current zone is Etc/UTC
tokyo time zone is 2018-04-09T15:21:13.220+09:00[Asia/Tokyo]
formatted tokyo time zone 09-04-2018 15:21:13
Period and Duration classes :
Period : It deals with date based amount of time.
Duration : It deals with time based amount of time.

// Java code for period and duration
import java.time.LocalDate;
import java.time.LocalTime;
import java.time.Month;
import java.time.Duration;
import java.time.Period;
 
public class Geekforgeeks {
 
    public static void checkingPeriod()
    {
        LocalDate date1 = LocalDate.now();
 
        LocalDate date2 = 
            LocalDate.of(2014, Month.DECEMBER, 12);
 
        Period gap = Period.between(date2, date1);
        System.out.println("gap between dates "+
                           "is a period of "+gap);
}
 
    // Function to check duration
    public static void checkingDuraion()
    { 
 
        LocalTime time1 = LocalTime.now();
        System.out.println("the current time is " +
                            time1);
 
        Duration fiveHours = Duration.ofHours(5);
 
        // adding five hours to the current 
        // time and storing it in time2
        LocalTime time2 = time1.plus(fiveHours);
 
        System.out.println("after adding five hours " +
                           "of duration " + time2);
 
        Duration gap = Duration.between(time2, time1);
        System.out.println("duraion gap between time1" +
                           " & time2 is " + gap);
}
 
    // Driver code
    public static void main(String[] args) 
    {
        checkingPeriod();
        checkingDuraion();
    }
}
Output:
gap between dates is a period of P3Y3M28D
the current time is 06:21:18.248
after adding five hours of duration 11:21:18.248
duraion gap between time1 & time2 is PT-5H
ChronoUnits Enum : java.time.temporal.ChronoUnit enum is added in Java 8 to replace integer values used in old API to represent day, month etc.
// Java code for ChronoUnits Enum
import java.time.LocalDate;
import java.time.temporal.ChronoUnit;
 
public class Geeksforgeeks {
 
    // Function to check ChronoUnit 
    public static void checkingChronoEnum()
    {
        LocalDate date = LocalDate.now();
        System.out.println("current date is :" + 
                            date);
     
        // adding 2 years to the current date
        LocalDate year = 
             date.plus(2, ChronoUnit.YEARS);
         
        System.out.println("next to next year is " + 
                            year);
             
        // adding 1 month to the current data
        LocalDate nextMonth = 
                  date.plus(1, ChronoUnit.MONTHS);
         
        System.out.println("the next month is " + 
                            nextMonth);
     
        // adding 1 week to the current date
        LocalDate nextWeek = 
                  date.plus(1, ChronoUnit.WEEKS);
         
        System.out.println("next week is " + nextWeek);
     
        // adding 2 decades to the current date
        LocalDate Decade = 
                  date.plus(2, ChronoUnit.DECADES);
                   
        System.out.println("20 years after today " + 
                            Decade);
    }
     
    // Driver code
    public static void main(String[] args) {
     
        checkingChronoEnum();
         
    }
}
Output:
current date is :2018-04-09
next to next year is 2020-04-09
the next month is 2018-05-09
next week is 2018-04-16
20 years after today 2038-04-09
TemporalAdjuster : It is used to perform various date related operations.
// Java code Temporal Adjuster
import java.time.LocalDate;
import java.time.temporal.TemporalAdjusters;
import java.time.DayOfWeek;
 
public class Geek 
{
 
    // Function to check date and time 
    // according to our requirement
    public static void checkingAdjusters()
    {
 
        LocalDate date = LocalDate.now();
        System.out.println("the current date is "+
                            date);
 
        // to get the first day of next month
        LocalDate dayOfNextMonth = 
              date.with(TemporalAdjusters.
                        firstDayOfNextMonth());
     
        System.out.println("firstDayOfNextMonth : " +
                            dayOfNextMonth );
 
        // get the next saturday
        LocalDate nextSaturday = 
                date.with(TemporalAdjusters.
                          next(DayOfWeek.SATURDAY));
         
        System.out.println("next satuday from now is "+
                            nextSaturday);
 
        // first day of current month
        LocalDate firstDay = 
                  date.with(TemporalAdjusters.
                  firstDayOfMonth());
                                   
        System.out.println("firstDayOfMonth : " +
                            firstDay);
 
        // last day of current month     
        LocalDate lastDay = 
                  date.with(TemporalAdjusters.
                            lastDayOfMonth());
         
        System.out.println("lastDayOfMonth : " + 
                            lastDay);
}
     
    // Driver code
    public static void main(String[] args) 
    {
 
        checkingAdjusters();
    }
}
Output:
the current date is 2018-04-09
firstDayOfNextMonth : 2018-05-01
next satuday from now is 2018-04-14
firstDayOfMonth : 2018-04-01
lastDayOfMonth : 2018-04-30

Cheers :)