mcp:~>perl days.pl
Can't locate object method "use_locale" via package "Time::Piece" at days.pl line 10.

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Days are Sun Mon Tue Wed Thu Fri Sat
Days are Time::Piece

##</code><code>##

p5-Time-Piece-1.23_1           Time::Piece - Object Oriented time objects
This is perl 5, version 24, subversion 3 (v5.24.3) built for amd64-freebsd-thread-multi

##</code><code>##

mcp:~>LC_TIME=de_DE.UTF-8 perl -MTime::Piece -le 'print join",",Time::Piece->day_list'
Sun,Mon,Tue,Wed,Thu,Fri,Sat