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Details

Type: Bug
Resolution: Done
Priority: P2: Important
Fix Version/s: 6.1.2, 6.2.0 Alpha
Affects Version/s: 5.15.0, 6.0.0
Component/s: Core: Date/Time
Labels:
None
Environment:
macOS 11.2 Big Sur
Apple clang version 12.0.0 (clang-1200.0.32.29)
Target: x86_64-apple-darwin20.3.0
Thread model: posix

Platform/s:

macOS
Story Points:
3
Commits:
f9469990d0fb1ae9444d415390ec8be483ec4ab3 (qt/qtbase/dev) 02c7b658f6246220fa926abb2b69779d2ffe77f1 (qt/qtbase/6.1) 0c47482edefd35f5d7413a970d8dd088e7e3b743 (qt/qtbase/6.2) 54181e1b757a9ef42b446afb230fc2317fc23c37 (qt/tqtc-qtbase/5.15)
Sprint:
Qt6_Foundation_Sprint 35

Description

With Qt 5.15.0 or Qt 6.0.0 on macOS 11.2 Big Sur, these conversions yield invalid dates:

qDebug() << QDate::fromString("1978-04-02", "yyyy-MM-dd");
qDebug() << QDate::fromString("02-04-1978", "dd-MM-yyyy");

This behaviour occurs for at least three other dates, i.e., 1977-03-27, 1978-04-02, 1979-04-01, 1980-03-30. This can be checked with the following code (compilable example attached):

QString format("yyyy-MM-dd");
for (int year=1930; year <= 2030; ++year)
{
	QDate date(year,1,1);
	while (date != QDate(year+1,1,1))
	{
		QString str = date.toString(format);
		QDate converted = QDate::fromString(str, format);
		if (converted != date)
			qDebug() << date << converted;
		date = date.addDays(1);
	}
}