java.time.LocalDateTime Class in Java
java.time.LocalDateTime class, introduced in Java 8, represents a local date-time object without timezone information. The LocalDateTime class in Java is an immutable date-time object that represents a date in the yyyy-MM-dd-HH-mm-ss.zzz format. It implements the ChronoLocalDateTime interface and inherits the object class.
Wherever we need to represent time without a timezone reference, we can use the LocalDateTime instances. LocalDateTime, for example, can be used to start batch jobs in any application. Jobs will be run at a fixed time in the timezone in which the server is located. Note LocalDateTime instances are immutable and thread.
Syntax: Class declaration
public final class LocalDateTime
extends Object
implements Temporal, TemporalAdjuster, ChronoLocalDateTime<LocalDate>, Serializable
Methods of this class are as follows:
| Method | Description |
|---|---|
| format() | It is used to format this date-time using the specified formatter. |
| get() | It is used to get the value of the specified field from this date-time as an int. |
| minusMinutes() | Returns a copy of this LocalDateTime with the specified number of minutes subtracted. |
| minusYears() | Returns a copy of this LocalDateTime with the specified number of years subtracted. |
| minusDays() | Returns a copy of this LocalDateTime with the specified number of days subtracted. |
| now() | It is used to obtain the current date-time from the system clock in the default time zone. |
| plusHours() | Returns a copy of this LocalDateTime with the specified number of hours added. |
| plusYears() | Returns a copy of this LocalDateTime with the specified number of years added. |
| plusDays() | Returns a copy of this LocalDateTime with the specified number of days added. |
Some more methods to modify local time are as follows in LocalDateTime can be used to get to a new localdatetime instance relative to an existing localdatetime instance. They are namely as follows:
plusYears(), plusMonths(), plusDays(), plusHours(), plusMinutes(), plusSeconds(), plusNanos(), minusYears(), minusMonths(), minusDays(), minusHours(), minusMinutes(), minusSeconds(), minusNanos()
Examples 1:
// Java Program to illustrate LocalDateTime Class of java.time package
// Importing LocalDateTime class from java.time package
import java.time.LocalDateTime;
// Main class for LocalDateTime
public class GFG {
// Main driver method
public static void main(String[] args)
{
// Creating an object of LocalDateTime class
// in the main() method
LocalDateTime now = LocalDateTime.now();
// Print statement
System.out.println(now);
// Adding 1 year, 1 month, 1 week and 1 day
LocalDateTime localDateTime1 = now.plusYears(1)
.plusMonths(1)
.plusWeeks(1)
.plusDays(1);
// Print statement
System.out.println(localDateTime1);
// Subtracting 1 year, 1 month, 1 week and 1 day
LocalDateTime localDateTime2
= localDateTime1.minusYears(1)
.minusMonths(1)
.minusWeeks(1)
.minusDays(1);
// Print statement
System.out.println(localDateTime2);
// Adding 1 hour, 1 minute, 1 second and 100
// nanoseconds
LocalDateTime localDateTime3
= localDateTime2.plusHours(1)
.plusMinutes(1)
.plusSeconds(1)
.plusNanos(100);
// Print statement
System.out.println(localDateTime3);
// Subtracting 1 hour, 1 minute, 1 second and 100
// nanoseconds
LocalDateTime localDateTime4
= localDateTime3.minusHours(1)
.minusMinutes(1)
.minusSeconds(1)
.minusNanos(100);
// Print statement
System.out.println(localDateTime4);
}
}
Output:
Example 2: Creating a specified time
// Java Program to illustrate LocalDateTime Class
// of java.time package by creating specific time
// Importing required classes from resp packages
import java.time.*;
import java.time.format.*;
// main class
class GFG {
// Main driver method
public static void main(String[] args)
{
// Milliseconds
LocalDateTime localDateTime1 = LocalDateTime.of(
2021, 04, 24, 14, 33, 48, 123456789);
// Print statement
System.out.println(localDateTime1);
// Month
LocalDateTime localDateTime2 = LocalDateTime.of(
2021, Month.APRIL, 24, 14, 33, 48, 123456789);
// Print statement
System.out.println(localDateTime2);
// Seconds
LocalDateTime localDateTime3 = LocalDateTime.of(
2021, Month.APRIL, 24, 14, 33, 48);
// Print statement
System.out.println(localDateTime3);
// Minutes
LocalDateTime localDateTime4 = LocalDateTime.of(
2021, Month.APRIL, 24, 14, 33);
// Print statement
System.out.println(localDateTime4);
// Local date + Local time
LocalDate date = LocalDate.of(2021, 04, 24);
LocalTime time = LocalTime.of(10, 34);
LocalDateTime localDateTime5
= LocalDateTime.of(date, time);
// Print statement
System.out.println(localDateTime5);
}
}
Output:
Example 3: Format LocalDateTime to string
To format a local time to the desired string representation, use the LocalDateTime.format(DateTimeFormatter) method.
// Java Program to illustrate LocalDateTime Class by
// Formatting LocalDateTime to string
// Importing all classes from java.time package
import java.time.LocalDateTime;
import java.time.format.*;
import java.util.*;
// Main class
class GFG {
// Main driver method
public static void main(String[] args)
{
// Creating an object of DateTimeFormatter class
DateTimeFormatter formatter
= DateTimeFormatter.ofPattern(
"yyyy-MM-dd HH:mm:ss a");
// Creating an object of LocalDateTime class
// and getting local date and time using now()
// method
LocalDateTime now = LocalDateTime.now();
// Formatting LocalDateTime to string
String dateTimeString = now.format(formatter);
// Print and Display
System.out.println(dateTimeString);
}
}
Output:
Note: In order to parse a string to LocalDateTime, convert time in a string to a local time instance, the LocalDateTime class has two overloaded parse() methods.
- parse(CharSequence text)
- parse(CharSequence text, DateTimeFormatter formatter)
