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
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