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);     } } 

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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);     } } 

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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));    } } 

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Output:

1 44 13 15 956

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 ); } } 

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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 ); } } 

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Output:

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

Next TopicJava MonthDay

Java LocalDateTime

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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