Just an FYI if it helps anyone
We are building our own perl 5.24.1 perl package for debian to fix some
bugs (https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=900739)
As a result, the date ticking over to 2020 broke the build due to tests
in 5.24.1
I provided a patch under the same license terms as perl to the kind
people at Debian for the official package in their bug
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=915209
The patch
https://bugs.debian.org/cgi-bin/bugreport.cgi?att=1;bug=915209;filename=999_deb915209.diff;msg=24
Other people may find it useful if you are perlbrewing, plenving etc.
Enjoy
Dean