to make tests pass after 2023
Background:
As part of my work on reproducible builds for openSUSE, I check
that software still gives identical build results in the future.
The usual offset is +15 years, because that is how long I expect
some software will be used in some places.
This showed up failing tests in our package build.
See https://reproducible-builds.org/ for why this matters.
Note: I tested that i586 builds still pass tests on 2037-12-01
so this change introduces no year2038 problem.
Change-Id: I0110914432c4b557dcabcac0fad1ba54bcd8be85
af8e8c2593