Java DateTimeFormatter with Optional Section

Introduction

You can add optional section using [] in DateTimeFormatter. 

import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;

public class Main {
  public static void main(String[] args) {
    // A pattern with an optional section
    String pattern = "MM/dd/yyyy[ 'at' HH:mm:ss]";
    DateTimeFormatter fmt = DateTimeFormatter.ofPattern(pattern);

    LocalDate ld = LocalDate.now();
    String str1 = fmt.format(ld);
    System.out.println(str1);/*ww w  .jav  a  2  s  .c om*/

    LocalDateTime ldt = LocalDateTime.now();
    String str2 = fmt.format(ldt);
    System.out.println(str2);
  }
}



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