The format() method of ChronoLocalDateTime interface in Java formats this date-time using the specified formatter.
Syntax:
default String format(DateTimeFormatter formatter)
Parameter: This method accepts a parameter formatter which specifies the DateTimeFormatter to use, not null.
Returns: The function returns the formatted date string and not null.
Below programs illustrate the ChronoLocalDateTime.format() method:
Program 1:
// Java program to illustrate the format() method import java.util.*;import java.time.*;import java.time.chrono.*;import java.time.format.DateTimeFormatter; public class GfG { public static void main(String[] args) { // Parses the date ChronoLocalDateTime dt1 = LocalDateTime .parse("2018-11-03T12:45:30"); // Prints the date System.out.println("Original ChronoLocalDateTime: " + dt1); // Display d1 in different formats // using format() method System.out.println("BASIC_ISO_DATE format: " + (DateTimeFormatter.BASIC_ISO_DATE) .format(dt1)); System.out.println("ISO_LOCAL_DATE format: " + (DateTimeFormatter.ISO_LOCAL_DATE) .format(dt1)); System.out.println("ISO_DATE format: " + (DateTimeFormatter.ISO_DATE) .format(dt1)); System.out.println("ISO_LOCAL_TIME format: " + (DateTimeFormatter.ISO_LOCAL_TIME) .format(dt1)); }} |
Output:
Original ChronoLocalDateTime: 2018-11-03T12:45:30 BASIC_ISO_DATE format: 20181103 ISO_LOCAL_DATE format: 2018-11-03 ISO_DATE format: 2018-11-03 ISO_LOCAL_TIME format: 12:45:30
Program 2:
// Program to illustrate the format() method import java.util.*;import java.time.*;import java.time.chrono.*;import java.time.format.DateTimeFormatter; public class GfG { public static void main(String[] args) { // Parses the date ChronoLocalDateTime dt1 = LocalDateTime .parse("2016-09-06T12:45:30"); // Prints the date System.out.println(dt1); // Display d1 in different formats // using format() method System.out.println("ISO_TIME format: " + (DateTimeFormatter.ISO_TIME) .format(dt1)); System.out.println("ISO_LOCAL_DATE_TIME format: " + (DateTimeFormatter.ISO_LOCAL_DATE_TIME) .format(dt1)); System.out.println("ISO_DATE_TIME format: " + (DateTimeFormatter.ISO_DATE_TIME) .format(dt1)); System.out.println("ISO_ORDINAL_DATE format: " + (DateTimeFormatter.ISO_ORDINAL_DATE) .format(dt1)); System.out.println("ISO_WEEK_DATE format: " + (DateTimeFormatter.ISO_WEEK_DATE) .format(dt1)); }} |
Output:
2016-09-06T12:45:30 ISO_TIME format: 12:45:30 ISO_LOCAL_DATE_TIME format: 2016-09-06T12:45:30 ISO_DATE_TIME format: 2016-09-06T12:45:30 ISO_ORDINAL_DATE format: 2016-250 ISO_WEEK_DATE format: 2016-W36-2