The current JRE of JIRA does not reflect Istanbul's time zone change.

Problem Definition

As of September 7th 2016, Turkey has decided to no longer follow the practice of having DST. As a result, their timezone has been changed from GMT+2 to GMT+3.

At the current stage of writing, JIRA's bundled JRE does not contain the data that reflects this change, hence causing Istanbul's timezone to be listed as GMT+2 instead of GMT+3.

One of the impact of this issue is the following: when user sets a date from a Date picker type field, the Due Date field shows 1 day before/behind the selected date.

Workaround

• Download the latest joda-time release here: https://github.com/JodaOrg/joda-time/releases
• Replace the existing joda-time-*.jar file in:
  • $jira_install/atlassian-jira/WEB-INF/lib
• Restart JIRA Afterwards.