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Java LocalDateTime class

Java LocalDateTime class is an immutable date-time object that represents a date-time, with the default format as yyyy-MM-dd-HH-mm-ss.zzz. It inherits object class and implements the ChronoLocalDateTime interface.

Java LocalDateTime class declaration

Let's see the declaration of java.time.LocalDateTime class.

public final class LocalDateTime extends Object 
implements Temporal, TemporalAdjuster, ChronoLocalDateTime<LocalDate>, Serializable

Methods of Java LocalDateTime

Method	Description
String format(DateTimeFormatter formatter)	It is used to format this date-time using the specified formatter.
int get(TemporalField field)	It is used to get the value of the specified field from this date-time as an int.
LocalDateTime minusDays(long days)	It is used to return a copy of this LocalDateTime with the specified number of days subtracted.
static LocalDateTime now()	It is used to obtain the current date-time from the system clock in the default time-zone.
static LocalDateTime of(LocalDate date, LocalTime time)	It is used to obtain an instance of LocalDateTime from a date and time.
LocalDateTime plusDays(long days)	It is used to return a copy of this LocalDateTime with the specified number of days added.
boolean equals(Object obj)	It is used to check if this date-time is equal to another date-time.

Java LocalDateTime Example

import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
public class LocalDateTimeExample1 {
    public static void main(String[] args) {
        LocalDateTime now = LocalDateTime.now();
        System.out.println("Before Formatting: " + now);
        DateTimeFormatter format = DateTimeFormatter.ofPattern("dd-MM-yyyy HH:mm:ss");
        String formatDateTime = now.format(format);
        System.out.println("After Formatting: " + formatDateTime);
    }
}

Test it Now

Output:

Before Formatting: 2017-01-13T17:09:42.411
After Formatting: 13-01-2017 17:09:42

Java LocalDateTime Example: now()

import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
public class LocalDateTimeExample2 {
  public static void main(String[] args) {
    LocalDateTime datetime1 = LocalDateTime.now();
    DateTimeFormatter format = DateTimeFormatter.ofPattern("dd-MM-yyyy HH:mm:ss");
    String formatDateTime = datetime1.format(format); 
    System.out.println(formatDateTime);  
  }
}

Test it Now

Output:

14-01-2017 11:42:32

Java LocalDateTime Example: get()

import java.time.LocalDateTime;
import java.time.temporal.ChronoField;
public class LocalDateTimeExample3 {
  public static void main(String[] args) {
    LocalDateTime a = LocalDateTime.of(2017, 2, 13, 15, 56);  
    System.out.println(a.get(ChronoField.DAY_OF_WEEK));
    System.out.println(a.get(ChronoField.DAY_OF_YEAR));
    System.out.println(a.get(ChronoField.DAY_OF_MONTH));
    System.out.println(a.get(ChronoField.HOUR_OF_DAY));
    System.out.println(a.get(ChronoField.MINUTE_OF_DAY)); 
  }
}

Test it Now

Output:

Java LocalDateTime Example: minusDays()

import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
public class LocalDateTimeExample4 {
public static void main(String[] args) {
  LocalDateTime datetime1 = LocalDateTime.of(2017, 1, 14, 10, 34);
  LocalDateTime datetime2 = datetime1.minusDays(100);
  System.out.println("Before Formatting: " + datetime2);
  DateTimeFormatter format = DateTimeFormatter.ofPattern("dd-MM-yyyy HH:mm");
  String formatDateTime = datetime2.format(format); 
  System.out.println("After Formatting: " + formatDateTime );
}
}

Test it Now

Output:

Before Formatting: 2016-10-06T10:34
After Formatting: 06-10-2016 10:34

Java LocalDateTime Example: plusDays()

import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
public class LocalDateTimeExample5 {
public static void main(String[] args) {
  LocalDateTime datetime1 = LocalDateTime.of(2017, 1, 14, 10, 34);
  LocalDateTime datetime2 = datetime1.plusDays(120);
  System.out.println("Before Formatting: " + datetime2);
  DateTimeFormatter format = DateTimeFormatter.ofPattern("dd-MM-yyyy HH:mm");
  String formatDateTime = datetime2.format(format); 
  System.out.println("After Formatting: " + formatDateTime );
}
}

Test it Now

Output:

Before Formatting: 2017-05-14T10:34
After Formatting: 14-05-2017 10:34

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Java LocalDateTime class

Java LocalDateTime class declaration

Methods of Java LocalDateTime

Java LocalDateTime Example

Java LocalDateTime Example: now()

Java LocalDateTime Example: get()

Java LocalDateTime Example: minusDays()

Java LocalDateTime Example: plusDays()

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