[tz] wrong Europe/Dublin dst offset rule

[Paul Eggert]

On 01/19/2018 12:53 AM, Vicky wrote:
>
> while parsing the data i found the issue in rule Europe/Dublin
> Negative DST.. Previous version or not in any other file there is no 
> negative dst.

Yes, although negative DST support is required by POSIX and has been in 
tzcode for quite some time, that was the first use of it in tzdata. That 
change was intended to support Irish Standard Time, which is an hour 
ahead of GMT (which Ireland uses in winter). We're planning to back that 
change out temporarily, since we found some issues with it with ICU and 
with OpenJDK.

What software are you using to parse the data files? Has the problem 
been reported to the maintainers of that software?