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  1. JDK
  2. JDK-8285838

DST not applying properly with zone id offset set with TZ env variable

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Details

    • Bug
    • Resolution: Fixed
    • P4
    • 20
    • 18
    • core-libs
    • None
    • b02
    • Fix failed

    Description

      On behalf of Gaurav Chaudhari:

      When a match cannot be made directly against a recognized region/timezone from the tzdb.dat, TimeZone.getSystemGMTOffsetID() is invoked to find the GMT based offset to calculate the offset and find the corresponding time.
      The native code reached in TimeZone_md.c has a bug for platforms that are not MacOS, where daylight savings is not respected.

      To reproduce the issue:
      TZ="MEZ-1MESZ,M3.5.0,M10.5.0" java -cp . TimeTest
      with the following test , TimeTest.java
      import java.util.Calendar;
      import java.util.TimeZone;
      import java.util.Date;
      import java.text.SimpleDateFormat;


      public class TimeTest {
              public static void main(String args[]) {
                      Date time = Calendar.getInstance().getTime();
                      SimpleDateFormat sdf = new SimpleDateFormat("dd.MM.yyyy HH:mm:ss.SSS");

                      System.out.println("Calendar.getInstance().getTime() = "+time);
                      System.out.println("SimpleDateFormat = "+sdf.format(time));
              }
      }

      Reproducible on Linux on Z (s390x) OpenJDK18 (jdk18+38 Temurin)
      TZ="MEZ-1MESZ,M3.5.0,M10.5.0" ~/jdk-18+36/bin/java -cp . TimeTest
      Calendar.getInstance().getTime() = Thu Apr 28 15:55:16 GMT+01:00 2022
      SimpleDateFormat = 28.04.2022 15:55:16.171

      Zone ID can be set according to guidelines below:
      https://www.gnu.org/software/libc/manual/html_node/TZ-Variable.html

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              tsteele Tyler Steele
              tsteele Tyler Steele
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                Created:
                Updated:
                Resolved: