The java.time.LocalDateTime class is an immutable date-time class that represents a date-time with the default format as yyyy-MM-dd-HH-mm-ss.zzz. This class does not store or represent a time-zone. Instead, it is a description of the date, as used for birthdays, combined with the local time as seen on a wall clock. It cannot represent an instant on the time-line without additional information such as an offset or time-zone.
Java LocalDateTime class methods
| 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. |
Example
package com.w3spoint;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.time.temporal.ChronoField;
public class TestExample {
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);
//Get different values
LocalDateTime dateTime1 = LocalDateTime.of(2018, 3, 23, 22, 46);
System.out.println(dateTime1.get(ChronoField.DAY_OF_WEEK));
System.out.println(dateTime1.get(ChronoField.DAY_OF_YEAR));
System.out.println(dateTime1.get(ChronoField.DAY_OF_MONTH));
System.out.println(dateTime1.get(ChronoField.HOUR_OF_DAY));
System.out.println(dateTime1.get(ChronoField.MINUTE_OF_DAY));
//Minus days
LocalDateTime dateTime2 = LocalDateTime.of(2018, 2, 23, 22, 46);
LocalDateTime dateTime3 = dateTime2.minusDays(100);
System.out.println("Before Formatting: " + dateTime3);
formatDateTime = dateTime3.format(format);
System.out.println("After Formatting: " + formatDateTime );
//Plus days
LocalDateTime dateTime4 = LocalDateTime.of(2018, 5, 23, 22, 46);
LocalDateTime dateTime5 = dateTime4.plusDays(100);
System.out.println("Before Formatting: " + dateTime5);
formatDateTime = dateTime5.format(format);
System.out.println("After Formatting: " + formatDateTime );
}
} |
package com.w3spoint; import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.time.temporal.ChronoField; public class TestExample {
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);
//Get different values
LocalDateTime dateTime1 = LocalDateTime.of(2018, 3, 23, 22, 46);
System.out.println(dateTime1.get(ChronoField.DAY_OF_WEEK));
System.out.println(dateTime1.get(ChronoField.DAY_OF_YEAR));
System.out.println(dateTime1.get(ChronoField.DAY_OF_MONTH));
System.out.println(dateTime1.get(ChronoField.HOUR_OF_DAY));
System.out.println(dateTime1.get(ChronoField.MINUTE_OF_DAY));
//Minus days
LocalDateTime dateTime2 = LocalDateTime.of(2018, 2, 23, 22, 46);
LocalDateTime dateTime3 = dateTime2.minusDays(100);
System.out.println("Before Formatting: " + dateTime3);
formatDateTime = dateTime3.format(format);
System.out.println("After Formatting: " + formatDateTime );
//Plus days
LocalDateTime dateTime4 = LocalDateTime.of(2018, 5, 23, 22, 46);
LocalDateTime dateTime5 = dateTime4.plusDays(100);
System.out.println("Before Formatting: " + dateTime5);
formatDateTime = dateTime5.format(format);
System.out.println("After Formatting: " + formatDateTime );
}
}
Output
Before Formatting: 2018-04-15T18:45:45.318
After Formatting: 15-04-2018 18:45:45
5
82
23
22
1366
Before Formatting: 2017-11-15T22:46
After Formatting: 15-11-2017 22:46:00
Before Formatting: 2018-08-31T22:46
After Formatting: 31-08-2018 22:46:00 |
Before Formatting: 2018-04-15T18:45:45.318
After Formatting: 15-04-2018 18:45:45
5
82
23
22
1366
Before Formatting: 2017-11-15T22:46
After Formatting: 15-11-2017 22:46:00
Before Formatting: 2018-08-31T22:46
After Formatting: 31-08-2018 22:46:00
