If you look onto implementation of Add in Date::Handler source you will see the source of the problem (I think): 

my $newdate = ref($self)->new({ date => $epoch, time_zone => $self->Ti
+meZone() });

[download]

As you can see it creates new Date::Handler object inside, and ignores locale attribute of the current object. So new object uses default locale which is en_US. I hope the patch that you will attach to bug report will be applied soon ;)

Also, have a look onto other modules for manipulations with dates. DateTime is quite popular nowadays.

In reply to Re: locale warnings when exec "+" op by zwon
in thread locale warnings when exec "+" op by PhillipHuang

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