Checking if OSX is on a 24 hour clock - c++

Question

I would prefer to do this with Qt Methods if at all possible.
Currently in our code, we can distinguish that Windows is on a 24 hour clock; however not on Mac.
We have a method that returns a string such as: 1/9/2012 9:53:42 AM - Which is giving us a previous time, not the current one (Which is what we want), I do not want to mess with this method though.
I've been playing around with a way to determine if the current system clock is in military time; and to adjust the previous time returned from the string to reflect that. I can get this to work on Windows, but on Mac - it displays a normal 12-hour time regardless of whether we're on a 24-hour clock.
Ignore my crude-debugging messages or if I'm not particularly going at the problem correctly - I haven't been able to test it yet and tweak as necessary: (Explanation after code)
QLocale *ql = new QLocale();
QString qlTF = ql->timeFormat();
QString fileTime = QString::fromUtf8(str.GetSafeStringPtr());
if (qlTF.left(1) == (QString("H"))) // Our system clock is set to military time
{
QString newTime;
QStringList fileTimeDateSplit = fileTime.split(" ");
QStringList fileTimeSplit = fileTimeDateSplit.at(1).split(":");
m_editModified->setText(qlTF);
if (fileTimeSplit.at(0).toInt() < 12 && (fileTimeDateSplit.at(2) == "PM"))
{
int newHour = 12 + (fileTimeSplit.at(0).toInt()%12);
newTime.append(QString::number(newHour));
newTime.append(":");
newTime.append(fileTimeSplit.at(1));
newTime.append(":");
newTime.append(fileTimeSplit.at(2));
m_editModified->setText(QString("military after noon"));
}
}
else m_editModified->setText(qlTF);
Basically I'm grabbing the locale of the current machine to retrieve the system's time format.
fileTime is set to a string such as "1/9/2012 9:53:42 AM".
qlTF returns a format such as: HH:mm:ss , H:mm:ss, hh:mm:ss, or h:mm:ss - capital meaning it's a 24 hour clock.
I tokenize the different strings by the delimiters and then check to see if the time was greater than 12 and PM; then add the additional time and combine the new time string.
You can see that I did:
m_editModified->setText(qlTF);
for debugging purposes. On Windows, this will be set to HH:mm:ss; however even with a 24-hour clock enabled on a mac, it still returns h:mm:ss - which completely defeats the purpose.
Any ideas would be very much appreciated!

Answer 1

Why don't you just convert the string you have ("1/9/2012 9:53:42 AM") to QDateTime and then convert that QDateTime back to string in the format you want (I use ISODate in the example):
QString timeFormat = "M/d/yyyy h:m:s AP";
QDateTime dt = QDateTime::fromString("1/9/2012 9:53:42 AM", timeFormat);
QString text = "";
if (dt.isValid())
text = dt.toString(Qt::ISODate);