@hskoglund this did indeed work. and the results are correct: "2025/01/04" Thank you for your help. Here is the code if anyone is curious: void jalaliToGregorian(int year, int month, int day) { QCalendar calendar(QCalendar::System::Jalali); QDate gregorianDate = calendar.dateFromParts(year, month, day); qDebug() << QString("%1/%2/%3") .arg(gregorianDate.year(), 4, 10, QChar('0')) .arg(gregorianDate.month(), 2, 10, QChar('0')) .arg(gregorianDate.day(), 2, 10, QChar('0')); }

Try updating Intel driver, some older releases are known to be buggy. Also, Qt Quick 2.6 - are you using Qt 5.6? If so, update to some newer version like 5.12 (LTS) or 5.14.

@mrjj I have moved forward from calling my saved dates to receive the following: Read Value: [object Object],[object Object],[object Object],[object Object],[object Object],[object Object] for key: dates (one for each date saved) when adding if(success) { console.log(JSON.stringify(value)) } I can also read the saved dates in the format of: [{"date":"2018-10-01T21:17:00.926"},{"date":"2018-10-02T12:00:00.000"},{"date":"2018-10-03T12:00:00.000"},{"date":"2018-10-06T12:00:00.000"},{"date":"2018-10-07T12:00:00.000"},{"date":"2018-10-08T12:00:00.000"}] now how would I determine these dates are saved in my calendar to add the marker? I have tried adding a property bool to the marker so the read value equals isMarked = true yet this either marks every date on the calendar or none at all depending on how I am working this?!? How would I convert the JSON string to individual date reads?

What exact error did you get ? What format is it ? How are you retrieving it ?