Lua calendar showing different behavior while shitf_zone

when I clone the repo from lau/calendar and try to do

iex(6)> {:ok, mvd } = Calendar.DateTime.from_erl {{2014,10,4},{23,44,32}}, "Etc/UTC"
{:ok, #DateTime<2014-10-04 23:44:32Z>}
iex(7)> mvd |> Calendar.DateTime.shift_zone!("Europe/Dublin")                       
#DateTime<2014-10-05 00:44:32+01:00 IST Europe/Dublin>
iex(8)> 

But in my project when I do shift zone it’s not doing the right operation

iex(6)> {:ok, mvd } = Calendar.DateTime.from_erl {{2014,10,4},{23,44,32}}, "Etc/UTC"
{:ok, #DateTime<2014-10-04 23:44:32Z>}
iex(8)> mvd |> Calendar.DateTime.shift_zone!("Europe/Dublin")
#DateTime<2014-10-04 23:44:32+00:00 GMT Europe/Dublin>
iex(9)> 

It’s doing everytime zone shift accurately but not for Europe Dublin and also selecting GMT when I do shift in my own project but when I do it in calendar repo iex , its using IST.

Please guide me with this problem, Do having Timex in the same project can be the problem?