I suspect I have some different version of Time::Piece than what you have: 
mcp:~>perl days.pl
Can't locate object method "use_locale" via package "Time::Piece" at d
+ays.pl line 10.

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and if I remove the "use_locale" line, I get this interesting result: 
Days are Sun Mon Tue Wed Thu Fri Sat
Days are Time::Piece

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I must admit, I have no clue why the second call to Time::Piece does not work anymore.

Versions are: 

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

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Last, but not least, Time::Piece apparently does not care for the locale by default: 
mcp:~>LC_TIME=de_DE.UTF-8 perl -MTime::Piece -le 'print join",",Time::
+Piece->day_list'
Sun,Mon,Tue,Wed,Thu,Fri,Sat

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In reply to Re^2: Localized weekday names by Sec
in thread Localized weekday names by Sec

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