Your code works for me on both Perl 5.22 on MacOS X and on Perl 5.16.3 on Ubuntu Linux: 

$ perl 1194689.pl
1969-05-10
1969-05-10

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The way forward always starts with a minimal test.

In reply to Re: How to format dates prior to 1970? by 1nickt
in thread How to format dates prior to 1970? by Hanfresco

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