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  1. JDK
  2. JDK-8160225

java.time.format.DateTimeFormatter issues for month-of-year

    Details

    • Subcomponent:
    • CPU:
      x86_64
    • OS:
      generic

      Description

      FULL PRODUCT VERSION :
      this is probably irrelevant
      java version "1.8.0_60"
      Java(TM) SE Runtime Environment (build 1.8.0_60-b27)
      Java HotSpot(TM) 64-Bit Server VM (build 25.60-b23, mixed mode)


      ADDITIONAL OS VERSION INFORMATION :
      3.19.0-61-generic #69~14.04.1-Ubuntu SMP Thu Jun 9 09:09:13 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

      EXTRA RELEVANT SYSTEM CONFIGURATION :
      its really just appears to be a documentation bug

      A DESCRIPTION OF THE PROBLEM :
      your line:
      M/L month-of-year number/text 7; 07; Jul; July; J

      should probably be either:
      M/L month-of-year text/number 7; 07; Jul; July; J
      or
      L/M month-of-year number/text 7; 07; Jul; July; J

      the order of letters in the first column should reflect the order of values in the third column

      REGRESSION. Last worked in version 8u73

      ADDITIONAL REGRESSION INFORMATION:
      it really just appears to be a documentation bug

      STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
      import java.lang.String;
      import java.time.format.DateTimeFormatter;
      import java.time.format.DateTimeParseException;
      import java.time.ZonedDateTime;

      class DTF {
          public static void main(String[] args) {
                  String ds = "Fri Apr 01 00:13:53 EDT 2016";
                  String dtfmt = "EEE MMM dd HH:mm:ss z yyyy";
                  System.err.println(dtfmt);

                  DateTimeFormatter fmtr = DateTimeFormatter.ofPattern(dtfmt);
                  ZonedDateTime date = ZonedDateTime.parse(ds, fmtr);

                  String text = date.format(fmtr);
                  System.err.println(text);
                  System.err.println(date.toString());
          }
      }


      EXPECTED VERSUS ACTUAL BEHAVIOR :
      EXPECTED -
      since the string contains 'Apr', I expected that I should have used 'LLL' instead of 'MMM' to parse the
      string.
      In this case, I would expect a date parse exception such as this:
      Exception in thread "main" java.time.format.DateTimeParseException: Text 'Fri Apr 01 00:13:53 EDT 2016' could not be parsed at index 4
      at java.time.format.DateTimeFormatter.parseResolved0(DateTimeFormatter.java:1949)
      at java.time.format.DateTimeFormatter.parse(DateTimeFormatter.java:1851)
      at java.time.ZonedDateTime.parse(ZonedDateTime.java:597)
      at DTF.main(DTF.java:15)

      ACTUAL -
      EEE MMM dd HH:mm:ss z yyyy
      Fri Apr 01 00:13:53 EDT 2016
      2016-04-01T00:13:53-04:00[America/New_York]


      ERROR MESSAGES/STACK TRACES THAT OCCUR :
      I got no error message with the format string "EEE MMM dd HH:mm:ss z yyyy"
      with the format string "EEE LLL dd HH:mm:ss z yyyy", I get:
      Exception in thread "main" java.time.format.DateTimeParseException: Text 'Fri Apr 01 00:13:53 EDT 2016' could not be parsed at index 4
      at java.time.format.DateTimeFormatter.parseResolved0(DateTimeFormatter.java:1949)
      at java.time.format.DateTimeFormatter.parse(DateTimeFormatter.java:1851)
      at java.time.ZonedDateTime.parse(ZonedDateTime.java:597)
      at DTF.main(DTF.java:15)


      REPRODUCIBILITY :
      This bug can be reproduced always.

      ---------- BEGIN SOURCE ----------
      import java.lang.String;
      import java.time.format.DateTimeFormatter;
      import java.time.format.DateTimeParseException;
      import java.time.ZonedDateTime;

      class DTF {
          public static void main(String[] args) {
                  String ds = "Fri Apr 01 00:13:53 EDT 2016";
                  String dtfmt = "EEE MMM dd HH:mm:ss z yyyy";
                  System.err.println(dtfmt);

                  DateTimeFormatter fmtr = DateTimeFormatter.ofPattern(dtfmt);
                  ZonedDateTime date = ZonedDateTime.parse(ds, fmtr);

                  String text = date.format(fmtr);
                  System.err.println(text);
                  System.err.println(date.toString());
          }
      }

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

      CUSTOMER SUBMITTED WORKAROUND :
      import java.lang.String;
      import java.time.format.DateTimeFormatter;
      import java.time.format.DateTimeParseException;
      import java.time.ZonedDateTime;

      class DTF {
          public static void main(String[] args) {
                  String ds = "Fri Apr 01 00:13:53 EDT 2016";
                  String dtfmt = "EEE MMM dd HH:mm:ss z yyyy";
                  System.err.println(dtfmt);

                  DateTimeFormatter fmtr = DateTimeFormatter.ofPattern(dtfmt);
                  ZonedDateTime date = ZonedDateTime.parse(ds, fmtr);

                  String text = date.format(fmtr);
                  System.err.println(text);
                  System.err.println(date.toString());
          }
      }


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              • Assignee:
                tvoniadka Thejasvi Voniadka
                Reporter:
                webbuggrp Webbug Group
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                Dates

                • Created:
                  Updated:
                  Resolved: