ChronoLocalDateTime format() method in Java with Examples

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:

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// 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));
    }
}

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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: 











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// 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)); 


    } 


} 



















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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





Reference: https://docs.oracle.com/javase/9/docs/api/java/time/chrono/ChronoLocalDateTime.html#format-java.time.format.DateTimeFormatter-



          
          
          
          

            

    

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