> perl -MTime::Piece -wE "say $Time::Piece::VERSION; my $t=Time::Piece->strptime('05/10/1969','%m/%d/%Y'); say $t->ymd; say $t->strftime('%Y-%m-%d')"
1.20_01
1969-05-10
1969-05-10

##</code><code>##

> perl -v

This is perl 5, version 14, subversion 2 (v5.14.2) built for MSWin32-x86-multi-thread