Java 8 Date Time API – LocalDateTime Example

Along with lambda expression, virtual methods, streams and many other nice features, Java 8 has also updated a new Date and Time API which is maintained under the JSR-310. One of the greatest on this new API is that all the date and time related APIs are unified under the same package java.time. In my previous articles I have explained about the LocalDate , LocalTime and few other APIs introduced with the Java 8 version.This example demonstrates how to use LocalDateTime class with few important methods defined in that class.

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LocalDateTime

java.time.LocalDateTime is an immutable, thread safe object which represents date-time without a time-zone in the ISO-8601 calendar system, such as 2014-03-30T02:51:21. This class normally stores date-time in year-month-day-hour-minute-second and provides accuracy up to the range of nanoseconds.

• Class Name : LocalDateTime
• Package : java.time
• Version Released : Java 1.8

LocalDateTime – Few Methods

• now() – This static method returns the current date time in the default system time zone
• now(ZoneId zoneId) – This static method returns the current date time in the specified time zone
• of(LocalDate,LocalTime) – This static method returns date time for the specified LocatDate and LocalTime objects
• of(year,month,day,hour,miniute,second,nanoseconds) – This static method returns date time by taking the arguments year, month, day, hour, minutes, seconds and nanoseconds
• of(year,month in enum,day,hour,miniute) – This static method returns date time by taking the arguments year, month in enum format, day, hour, minutes
• getDayOfMonth() – This is an instance method to return the current stored value of day
• getHour() – This is an instance method to return the current stored value of hour
• getMonth() – This is an instance method to return the current stored value of month
• plusDays(int) – This is an instance method to return the date time by adding the number is days passed to the method
• minusDays(int) – This is an instance method to return the date time by reducing the number is days passed to the method
• toLocalDate() – This is an instance method to return the LocalDate from the current LocalDateTime object
• toLocalTime() – This is an instance method to return the LocalTime from the current LocalDateTime object

LocalDateTime – Example

package javabeat.net;

import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.time.Month;
import java.time.ZoneId;

public class LocalDateTimeExample {
	public static void main(String[] args) {
		LocalDateTime localDateTime = LocalDateTime.now();
		LocalDateTime localDateTimeZone = LocalDateTime.now(ZoneId
				.of("America/Los_Angeles"));
		LocalDateTime today = LocalDateTime
				.of(LocalDate.now(), LocalTime.now());
		LocalDateTime ofMethod = LocalDateTime.of(2015, 4, 14, 12, 30, 23,
				12000);
		LocalDateTime ofMethod1 = LocalDateTime
				.of(2015, Month.APRIL, 1, 12, 30);
		int dayOfMonth = ofMethod1.getDayOfMonth();
		int hour = ofMethod1.getHour();
		Month month = ofMethod1.getMonth();
		LocalDateTime plusDays = ofMethod1.plusDays(10);
		LocalDateTime minusDays = ofMethod1.minusDays(12);
		LocalDate localDate = ofMethod1.toLocalDate();
		LocalTime localTime = ofMethod1.toLocalTime();

		System.out.println("LocalDateTime Example Demo");
		System.out.println("--------------------------");
		System.out.println("Current Date Time : " + localDateTime);
		System.out.println("Current Date Time at America/Los_Angeles : "
				+ localDateTimeZone);
		System.out.println("Current DateTime=" + today);
		System.out
				.println("LocalDateTime.0f(year, month,day, hour, minute, seconds, nano seconds) is :"
						+ ofMethod);
		System.out
				.println("LocalDateTime.0f(year, month IN ENUM,day, hour, minute) is :"
						+ ofMethod1);
		System.out.println("LocalDateTime().getDayOfMonth : " + dayOfMonth);
		System.out.println("LocalDateTime().getHour : " + hour);
		System.out.println("LocalDateTime().getMonth : " + month);
		System.out.println("LocalDateTime().plusDays : " + plusDays);
		System.out.println("LocalDateTime().minusDays : " + minusDays);
		System.out.println("LocalDateTime().toLocalDate : " + localDate);
		System.out.println("LocalDateTime().toLocalTime : " + localTime);
	}
}

Output for the above program will be:

LocalDateTime Example Demo
--------------------------
Current Date Time : 2015-04-14T06:45:44.323
Current Date Time at America/Los_Angeles : 2015-04-13T18:15:44.325
Current DateTime=2015-04-14T06:45:44.333
LocalDateTime.0f(year, month,day, hour, minute, seconds, nano seconds) is :2015-04-14T12:30:23.000012
LocalDateTime.0f(year, month IN ENUM,day, hour, minute) is :2015-04-01T12:30
LocalDateTime().getDayOfMonth : 1
LocalDateTime().getHour : 12
LocalDateTime().getMonth : APRIL
LocalDateTime().plusDays : 2015-04-11T12:30
LocalDateTime().minusDays : 2015-03-20T12:30
LocalDateTime().toLocalDate : 2015-04-01
LocalDateTime().toLocalTime : 12:30