I asked that before but now I made the problem more specified. Our O/S is linux debian 9 and tz is "Europe/Istanbul" and Jira version 17.3 and the details are below.


The problem started after the Jira 17.3 update. Frontend dates are acting like the time zone is UTC+2 ; here is an example;
When I select a date then confirm it, Jira shows the date -1 day. but hte db record is correct.


And when I change the db record as follow (adding 1 hour);

Jira shows correct date;

So I tried to change jira UTC+2, updating java tz file but both of them are not fixed the problem.
Any other advise?
Thanks