...as emitted by at least GCC 8.2 with --enable-optimized, by making the buffers
large enough for the (hypothetical) largest values of the various date/time
components

Change-Id: I82e9b08fa099546b2d6f29c702e1440df9e6c6e0
Reviewed-on: https://gerrit.libreoffice.org/66618
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>