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  1. JDK
  2. JDK-8222922

The examples in documentation of DateTimeFormatter not consistent with actual output

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    • CPU:
      generic
    • OS:
      generic

      Description

      ADDITIONAL SYSTEM INFORMATION :
      Tested on Windows, Mac OS, Ubuntu Linux on Java versions 8, 9, 11.

      A DESCRIPTION OF THE PROBLEM :
      When using DateTimeFormatter.ISO_LOCAL_DATE_TIME and any other value, from Java 9 and onwards the format will always contain nanoseconds in the ending, like '2019-04-16T13:32:50.694395' in spite of documentation giving the explicit example '2011-12-03T10:15:30'. For java 8 however it will provide the exact same format as the documentation example. This should either be reflected in documentation from version 9 and onward, or change the behavior to be in line with the documentation.

      STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
      Run the following code in java 9


      EXPECTED VERSUS ACTUAL BEHAVIOR :
      EXPECTED -
      A date formatted like '2019-04-16T13:39:45'
      ACTUAL -
      A date formatted like '2019-04-16T13:39:45.272079'

      ---------- BEGIN SOURCE ----------
      import java.time.ZonedDateTime;
      import java.time.format.DateTimeFormatter;
      import java.time.format.DateTimeFormatterBuilder;

      public class Main {

          public static void main(String[] args) {
              ZonedDateTime dateTime = ZonedDateTime.now();
              DateTimeFormatter formatter = new DateTimeFormatterBuilder()
                      .append(DateTimeFormatter.ISO_LOCAL_DATE_TIME)
                      .toFormatter();
              String answerTime = formatter.format(dateTime);
              System.out.println(answerTime);
          }
      }

      ---------- END SOURCE ----------

      FREQUENCY : always


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            • Assignee:
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              Reporter:
              webbuggrp Webbug Group
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