OS: Ubuntu 10.04 2.6.32-25 Perl Version: 5.10.1 Description: When use "+" op to add two created $date, it will always has locale warning messages. While it still can return the correct summary result. Reproduce steps: 1. As following "http://search.cpan.org/~bbeausej/Date-Handler- 1.2/Handler.pod#Using_Date::Handler::Delta_objects", create the below codes named "date.pl" 
#!/usr/bin/perl
# name: date.pl

use strict;
use warnings;
use Date::Handler;
use Date::Handler::Delta;

my $delta = new Date::Handler::Delta([1,0,0,0,0,0]);

my $date = new Date::Handler({ date => time } );

#$newdate is now one year in the furure.
my $newdate = $date+$delta;

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2. run it at command line, warnings displayed: 
phillip@Athen:~/script$ perl date1.pl
Locale en_US does not seem to be implemented on this system, keeping 
locale 
Locale en_US does not seem to be implemented on this system, keeping 
locale 
Locale en_US does not seem to be implemented on this system, keeping 
locale

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3. display OS locale parameters and modify the code, 
phillip@Athen:~/script$ locale
LANG=zh_CN.utf8
LANGUAGE=zh_CN:zh
LC_CTYPE="zh_CN.utf8"
LC_NUMERIC="zh_CN.utf8"
LC_TIME="zh_CN.utf8"
LC_COLLATE="zh_CN.utf8"
LC_MONETARY="zh_CN.utf8"
LC_MESSAGES="zh_CN.utf8"
LC_PAPER="zh_CN.utf8"
LC_NAME="zh_CN.utf8"
LC_ADDRESS="zh_CN.utf8"
LC_TELEPHONE="zh_CN.utf8"
LC_MEASUREMENT="zh_CN.utf8"
LC_IDENTIFICATION="zh_CN.utf8"
LC_ALL=

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#!/usr/bin/perl

use strict;
use warnings;
use Date::Handler;
use Date::Handler::Delta;

my $delta = new Date::Handler::Delta({
date=>[1,0,0,0,0,0],
time_zone=>'Asia/Shanghai',
locale=>'zh_CN.utf8',
});

my $date = new Date::Handler({
date=>time,
time_zone=>'Asia/Shanghai',
locale=>'zh_CN.utf8',
});

my $newdate = $date + $delta;

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4. run again: 
phillip@Athen:~/script$ perl date.pl
Locale en_US does not seem to be implemented on this system, keeping 
locale 
Locale en_US does not seem to be implemented on this system, keeping 
locale

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5. if add "#" to line:"my $newdate = $date + $delta;", save and run again. no warning messages. Phillip

In reply to locale warnings when exec "+" op by PhillipHuang

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