Document the limited range of datetimes that can be parsed from
strings and the (awkward) consequence of the range bounds being
specified in local time.
Add tests for UTC hitting those bounds and QEXPECT_FAIL() the ones
that (as the new docs say they may) fail. Technically the fact that
the UTC:min one *doesn't* fail is evidence of a bug in the existing
date-time parser. Its replacement should support unbounded parsing.
Pick to 6.8 required removing a QEXPECT_FAIL() specific (on MS) to the
std::chrono::tzdb backend, which isn't present before 6.9.
Fixes: QTBUG-129287
Task-number: QTBUG-77948
Pick-to: 6.5
Change-Id: Ic90558f1a06a62f7d0a947e37802370d1ab4e373
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
(cherry picked from commit 3e25203d4d5ba428309e972367dbdf99c4e70327)
4408d077ac