On Mandriva with Perl 5.8.8 I get: 
es
jueves, agosto 14, 2008

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I'm wondering if the locale handling in your perl is just broken or there's no good way to get the locale from your OS.

Update: I get the same on perl 5.10.0 on Mandriva. I get this from cygwin 5.8.6: 

undef
Thursday, August 14, 2008

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I get this from Strawberry and from ActivePerl, both 5.8.8/5.8.7 and 5.10: 
Estonian_Estonia.1257
neljapΣev, august 14, 2008

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How Estonian and Spanish get confused I'm not sure. I always thought 'es' was Spanish and Spain while 'et' was Estonian and Estonia (per sources like ISO 639, even though that particular list is marked obsolete).

In reply to Re: Spanish dates using POSIX by mr_mischief
in thread Spanish dates using POSIX by wfsp

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