Adapt date/time output for tests to Qt 6.7 formatting behavior changes
"t" is no longer outputting the timezone abbreviation ("CE[S]T") but a GMT offset fallback ("GMT+2"), so explicitly add the timezone abbreviation manually here.
"t" is no longer outputting the timezone abbreviation ("CE[S]T") but a GMT offset fallback ("GMT+2"), so explicitly add the timezone abbreviation manually here.