This PR fixes a broken test that makes the CI crash.
This is due to the library `date-fns` which now doesn't use the word
"about" in its relative date formatting, if we're not precisely on minus
2 months, which can change for example today the 29th of April, where
the 29th of February doesn't exist.
So instead of using months and falling into hard to test cases, we use
days instead, which is an easy and predictable relative computation.
fda793ced2