The LocalDateTime class in Java 8 represents a date-time without a time-zone in the ISO-8601 calendar system. It is a combination of LocalDate and LocalTime. This guide covers the essential methods provided by the LocalDateTime class, demonstrating how to create, manipulate, and query date-time objects.
1. now()
Obtains the current date-time from the system clock in the default time-zone.
Example:
import java.time.LocalDateTime;
public class LocalDateTimeExample {
public static void main(String[] args) {
LocalDateTime currentDateTime = LocalDateTime.now();
System.out.println("Current Date-Time: " + currentDateTime);
}
}
Output:
Current Date-Time: 2024-07-05T13:58:37.108724
2. of(int year, int month, int dayOfMonth, int hour, int minute)
Obtains an instance of LocalDateTime from a year, month, day, hour, and minute.
Example:
import java.time.LocalDateTime;
public class LocalDateTimeExample {
public static void main(String[] args) {
LocalDateTime dateTime = LocalDateTime.of(2024, 7, 5, 10, 15);
System.out.println("Specific Date-Time: " + dateTime);
}
}
Output:
Specific Date-Time: 2024-07-05T10:15
3. of(int year, int month, int dayOfMonth, int hour, int minute, int second)
Obtains an instance of LocalDateTime from a year, month, day, hour, minute, and second.
Example:
import java.time.LocalDateTime;
public class LocalDateTimeExample {
public static void main(String[] args) {
LocalDateTime dateTime = LocalDateTime.of(2024, 7, 5, 10, 15, 30);
System.out.println("Specific Date-Time: " + dateTime);
}
}
Output:
Specific Date-Time: 2024-07-05T10:15:30
4. parse(CharSequence text)
Obtains an instance of LocalDateTime from a text string such as 2007-12-03T10:15:30.
Example:
import java.time.LocalDateTime;
public class LocalDateTimeExample {
public static void main(String[] args) {
LocalDateTime dateTime = LocalDateTime.parse("2024-07-05T10:15:30");
System.out.println("Parsed Date-Time: " + dateTime);
}
}
Output:
Parsed Date-Time: 2024-07-05T10:15:30
5. plusYears(long years)
Returns a copy of this LocalDateTime with the specified number of years added.
Example:
import java.time.LocalDateTime;
public class LocalDateTimeExample {
public static void main(String[] args) {
LocalDateTime dateTime = LocalDateTime.now();
LocalDateTime newDateTime = dateTime.plusYears(2);
System.out.println("Date-Time plus 2 years: " + newDateTime);
}
}
Output:
Date-Time plus 2 years: 2026-07-05T13:58:37.489840
6. plusMonths(long months)
Returns a copy of this LocalDateTime with the specified number of months added.
Example:
import java.time.LocalDateTime;
public class LocalDateTimeExample {
public static void main(String[] args) {
LocalDateTime dateTime = LocalDateTime.now();
LocalDateTime newDateTime = dateTime.plusMonths(3);
System.out.println("Date-Time plus 3 months: " + newDateTime);
}
}
Output:
Date-Time plus 3 months: 2024-10-05T13:58:37.596334
7. plusDays(long days)
Returns a copy of this LocalDateTime with the specified number of days added.
Example:
import java.time.LocalDateTime;
public class LocalDateTimeExample {
public static void main(String[] args) {
LocalDateTime dateTime = LocalDateTime.now();
LocalDateTime newDateTime = dateTime.plusDays(10);
System.out.println("Date-Time plus 10 days: " + newDateTime);
}
}
Output:
Date-Time plus 10 days: 2024-07-15T13:58:37.692432
8. plusHours(long hours)
Returns a copy of this LocalDateTime with the specified number of hours added.
Example:
import java.time.LocalDateTime;
public class LocalDateTimeExample {
public static void main(String[] args) {
LocalDateTime dateTime = LocalDateTime.now();
LocalDateTime newDateTime = dateTime.plusHours(5);
System.out.println("Date-Time plus 5 hours: " + newDateTime);
}
}
Output:
Date-Time plus 5 hours: 2024-07-05T18:58:37.790362
9. plusMinutes(long minutes)
Returns a copy of this LocalDateTime with the specified number of minutes added.
Example:
import java.time.LocalDateTime;
public class LocalDateTimeExample {
public static void main(String[] args) {
LocalDateTime dateTime = LocalDateTime.now();
LocalDateTime newDateTime = dateTime.plusMinutes(30);
System.out.println("Date-Time plus 30 minutes: " + newDateTime);
}
}
Output:
Date-Time plus 30 minutes: 2024-07-05T14:28:37.890650
10. plusSeconds(long seconds)
Returns a copy of this LocalDateTime with the specified number of seconds added.
Example:
import java.time.LocalDateTime;
public class LocalDateTimeExample {
public static void main(String[] args) {
LocalDateTime dateTime = LocalDateTime.now();
LocalDateTime newDateTime = dateTime.plusSeconds(45);
System.out.println("Date-Time plus 45 seconds: " + newDateTime);
}
}
Output:
Date-Time plus 45 seconds: 2024-07-05T13:59:22.991715
11. minusYears(long years)
Returns a copy of this LocalDateTime with the specified number of years subtracted.
Example:
import java.time.LocalDateTime;
public class LocalDateTimeExample {
public static void main(String[] args) {
LocalDateTime dateTime = LocalDateTime.now();
LocalDateTime newDateTime = dateTime.minusYears(1);
System.out.println("Date-Time minus 1 year: " + newDateTime);
}
}
Output:
Date-Time minus 1 year: 2023-07-05T13:58:38.094711
12. minusMonths(long months)
Returns a copy of this LocalDateTime with the specified number of months subtracted.
Example:
import java.time.LocalDateTime;
public class LocalDateTimeExample {
public static void main(String[] args) {
LocalDateTime dateTime = LocalDateTime.now();
LocalDateTime newDateTime = dateTime.minusMonths(2);
System.out.println("Date-Time minus 2 months: " + newDateTime);
}
}
Output:
Date-Time minus 2 months: 2024-05-05T13:58:38.175919
13. minusDays(long days)
Returns a copy of this LocalDateTime with the specified number of days subtracted.
Example:
import java.time.LocalDateTime;
public class LocalDateTimeExample {
public static void main(String[] args) {
LocalDateTime dateTime = LocalDateTime.now();
LocalDateTime newDateTime = dateTime.minusDays(5);
System.out.println("Date-Time minus 5 days: " + newDateTime);
}
}
Output:
Date-Time minus 5 days: 2024-06-30T13:58:38.269588
14. minusHours(long hours)
Returns a copy of this LocalDateTime with the specified number of hours subtracted.
Example:
import java.time.LocalDateTime;
public class LocalDateTimeExample {
public static void main(String[] args) {
LocalDateTime dateTime = LocalDateTime.now();
LocalDateTime newDateTime = dateTime.minusHours(3);
System.out.println("Date-Time minus 3 hours: " + newDateTime);
}
}
Output:
Date-Time minus 3 hours: 2024-07-05T10:58:38.371307
15. minusMinutes(long minutes)
Returns a copy of this LocalDateTime with
the specified number of minutes subtracted.
Example:
import java.time.LocalDateTime;
public class LocalDateTimeExample {
public static void main(String[] args) {
LocalDateTime dateTime = LocalDateTime.now();
LocalDateTime newDateTime = dateTime.minusMinutes(15);
System.out.println("Date-Time minus 15 minutes: " + newDateTime);
}
}
Output:
Date-Time minus 15 minutes: 2024-07-05T13:43:38.467557
16. minusSeconds(long seconds)
Returns a copy of this LocalDateTime with the specified number of seconds subtracted.
Example:
import java.time.LocalDateTime;
public class LocalDateTimeExample {
public static void main(String[] args) {
LocalDateTime dateTime = LocalDateTime.now();
LocalDateTime newDateTime = dateTime.minusSeconds(30);
System.out.println("Date-Time minus 30 seconds: " + newDateTime);
}
}
Output:
Date-Time minus 30 seconds: 2024-07-05T13:58:08.564001
17. isAfter(LocalDateTime other)
Checks if this date-time is after the specified date-time.
Example:
import java.time.LocalDateTime;
public class LocalDateTimeExample {
public static void main(String[] args) {
LocalDateTime dateTime1 = LocalDateTime.now();
LocalDateTime dateTime2 = dateTime1.minusHours(1);
boolean isAfter = dateTime1.isAfter(dateTime2);
System.out.println("Is after: " + isAfter);
}
}
Output:
Is after: true
18. isBefore(LocalDateTime other)
Checks if this date-time is before the specified date-time.
Example:
import java.time.LocalDateTime;
public class LocalDateTimeExample {
public static void main(String[] args) {
LocalDateTime dateTime1 = LocalDateTime.now();
LocalDateTime dateTime2 = dateTime1.plusHours(1);
boolean isBefore = dateTime1.isBefore(dateTime2);
System.out.println("Is before: " + isBefore);
}
}
Output:
Is before: true
19. isEqual(LocalDateTime other)
Checks if this date-time is equal to the specified date-time.
Example:
import java.time.LocalDateTime;
public class LocalDateTimeExample {
public static void main(String[] args) {
LocalDateTime dateTime1 = LocalDateTime.now();
LocalDateTime dateTime2 = LocalDateTime.from(dateTime1);
boolean isEqual = dateTime1.isEqual(dateTime2);
System.out.println("Is equal: " + isEqual);
}
}
Output:
Is equal: true
20. toString()
Outputs this date-time as a String, such as 2007-12-03T10:15:30.
Example:
import java.time.LocalDateTime;
public class LocalDateTimeExample {
public static void main(String[] args) {
LocalDateTime dateTime = LocalDateTime.now();
System.out.println("Date-Time: " + dateTime.toString());
}
}
Output:
Date-Time: 2024-07-05T13:58:38.945236
21. toLocalDate()
Gets the LocalDate part of this date-time.
Example:
import java.time.LocalDate;
import java.time.LocalDateTime;
public class LocalDateTimeExample {
public static void main(String[] args) {
LocalDateTime dateTime = LocalDateTime.now();
LocalDate date = dateTime.toLocalDate();
System.out.println("Local Date: " + date);
}
}
Output:
Local Date: 2024-07-05
22. toLocalTime()
Gets the LocalTime part of this date-time.
Example:
import java.time.LocalDateTime;
import java.time.LocalTime;
public class LocalDateTimeExample {
public static void main(String[] args) {
LocalDateTime dateTime = LocalDateTime.now();
LocalTime time = dateTime.toLocalTime();
System.out.println("Local Time: " + time);
}
}
Output:
Local Time: 13:58:39.127136
This guide covers the essential methods provided by the LocalDateTime class in Java 8, demonstrating how to create, manipulate, and query date-time objects. Each method is illustrated with working examples to help you understand how to use them effectively in your applications.
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