Java DateTimeFormatter Predefined formatters

Introduction

The DateTimeFormatter predefined formatter are listed in the following table:

Formatter
 Target
 Description
 Example
BASIC_ISO_DATE
 date, time, date and time
 without using a separator between two date components.
 20200109, 20200109-0600
ISO_DATE,
 date
 ISO separators
 2020-01-09
ISO_TIME,
 time
 ISO separators
 15:38:32.927, 15:38:32.943-06:00,
ISO_DATE_TIME


 date and time


 ISO separators


 2020-01-09-06:00,
2020-01-09T15:20:07.747-06:00,
2020-01-09T15:20:07.825-06:00[America/Chicago]
ISO_INSTANT
 instant or ZonedDateTime
 in UTC format
 2020-01-09T21:23:56.870Z
ISO_LOCAL_DATE,
 Date
 without an offset
 2020-01-09,
ISO_LOCAL_TIME,
 time
 without an offset
 15:30:14.352,
ISO_LOCAL_DATE_TIME
 date and time
 without an offset
 2020-01-09T15:29:11.384
ISO_OFFSET_DATE,
 Date
 with an offset using ISO format
 2020-01-09-06:00,
ISO_OFFSET_TIME,
 time
 with an offset using ISO format
 15:34:29.851-06:00,
ISO_OFFSET_DATE_TIME
 date and time
 with an offset using ISO format
 2020-01-09T15:33:07.07-06:0
ISO_ZONED_DATE_TIME

 date and time

 with a zone id, if available

 2020-01-09T15:45:49.112-06:00,
2020-01-09T15:45:49.128-06:00[America/Chicago]
ISO_ORDINAL_DATE
 date
 with year and day-of-year
 2020-009
ISO_WEEK_DATE

 date (week-based dates)

 The format is year-Wweek_of_year-day_of_week

 2020-W02-4-06:00 2020-W02-4,
'2020-W02-4' means the fourth day of the second week in 2020.
RFC_1123_DATE_TIME
 date and time
 for e-mails using the RFC1123 specification
 Thu, 9 Jan 2020 15:50:44 -060

The following code has runtime error.

A runtime error as a LocalTime does not contain date components 

import java.time.LocalTime;
import java.time.format.DateTimeFormatter;

public class Main {
  public static void main(String[] args) {
    String s = DateTimeFormatter.ISO_DATE.format(LocalTime.now());
    System.out.println(s);/*from  w  w w  . ja v a2  s. c  o  m*/

  }
}

The date time object being formatted must contain the components as suggested by formatter.

ISO_DATE formatter expects the date components.




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