[plasmashell] [Bug 355858] digital clock does not display anything

[David Edmundson via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=355858

--- Comment #7 from David Edmundson <k...@davidedmundson.co.uk> ---
Timezones on Linux are apparently a mess. We have 4 different systems.
/etc/localtime is done by resolving the symlink path.

    // Check TZ env var first, if not populated try find it
    QByteArray ianaId = qgetenv("TZ");
    if (!ianaId.isEmpty() && ianaId.at(0) == ':')
        ianaId = ianaId.mid(1);

    // On Debian Etch and later /etc/localtime is real file with name held in
/etc/timezone
    if (ianaId.isEmpty()) {
        QFile tzif(QStringLiteral("/etc/timezone"));
        if (tzif.open(QIODevice::ReadOnly)) {
            // TODO QTextStream inefficient, replace later
            QTextStream ts(&tzif);
            if (!ts.atEnd())
                ianaId = ts.readLine().toUtf8();
        }
    }

    // On other distros /etc/localtime is symlink to real file so can extract
name from the path
    if (ianaId.isEmpty()) {
        const QString path =
QFile::symLinkTarget(QStringLiteral("/etc/localtime"));
        if (!path.isEmpty()) {
            // /etc/localtime is a symlink to the current TZ file, so extract
from path
            int index = path.indexOf(QLatin1String("/zoneinfo/")) + 10;
            ianaId = path.mid(index).toUtf8();
        }
    }

    // On some Red Hat distros /etc/localtime is real file with name held in
/etc/sysconfig/clock
    // in a line like ZONE="Europe/Oslo" or TIMEZONE="Europe/Oslo"
    if (ianaId.isEmpty()) {
        QFile tzif(QStringLiteral("/etc/sysconfig/clock"));
        if (tzif.open(QIODevice::ReadOnly)) {
            // TODO QTextStream inefficient, replace later
            QTextStream ts(&tzif);
            QString line;
            while (ianaId.isEmpty() && !ts.atEnd() && ts.status() ==
QTextStream::Ok) {
                line = ts.readLine();
                if (line.startsWith(QLatin1String("ZONE="))) {
                    ianaId = line.mid(6, line.size() - 7).toUtf8();
                } else if (line.startsWith(QLatin1String("TIMEZONE="))) {
                    ianaId = line.mid(10, line.size() - 11).toUtf8();
                }
            }
        }
    }

could you set the date with timedatectl?

Finally, do you have the env var TZ set? is there a /etc/timezone?

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