[tz] Europe/Dublin daylight saving time format confusion

[Guruswamy Basavaiah]

Hello,
  Generated timezone files using the below command on release 2018e.
   zic -L /dev/null -d output_dir  -y "sh yearistype.sh" europe

zdump show daylight saving flag (isdst=1) is wrongly set for
Europe/Dublin. Daylight saving time should start from March 31 and end
on October 27.
But here it shows reverse.
zdump -v /home/basavaia/output_dir/Europe/Dublin | grep 2019
/home/basavaia/output_dir/Europe/Dublin  Sun Mar 31 00:59:59 2019 UT =
Sun Mar 31 00:59:59 2019 GMT isdst=1 gmtoff=0
/home/basavaia/output_dir/Europe/Dublin  Sun Mar 31 01:00:00 2019 UT =
Sun Mar 31 02:00:00 2019 IST isdst=0 gmtoff=3600
/home/basavaia/output_dir/Europe/Dublin  Sun Oct 27 00:59:59 2019 UT =
Sun Oct 27 01:59:59 2019 IST isdst=0 gmtoff=3600
/home/basavaia/output_dir/Europe/Dublin  Sun Oct 27 01:00:00 2019 UT =
Sun Oct 27 01:00:00 2019 GMT isdst=1 gmtoff=0
Above Behavior is same in 2019a also.

If I check the same on 2018a, it gives proper output.
zdump -v /home/basavaia/2018a/Europe/Dublin | grep 2019
/home/basavaia/2018a/Europe/Dublin  Sun Mar 31 00:59:59 2019 UT = Sun
Mar 31 00:59:59 2019 GMT isdst=0 gmtoff=0
/home/basavaia/2018a/Europe/Dublin  Sun Mar 31 01:00:00 2019 UT = Sun
Mar 31 02:00:00 2019 IST isdst=1 gmtoff=3600
/home/basavaia/2018a/Europe/Dublin  Sun Oct 27 00:59:59 2019 UT = Sun
Oct 27 01:59:59 2019 IST isdst=1 gmtoff=3600
/home/basavaia/2018a/Europe/Dublin  Sun Oct 27 01:00:00 2019 UT = Sun
Oct 27 01:00:00 2019 GMT isdst=0 gmtoff=0

Is my understanding correct?
And this behavior is introduced in commit
127b4af7219e6df9253b34e390797c5527b8cc66

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-- 
Guruswamy Basavaiah