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diff --git a/src/corelib/doc/snippets/code/src_corelib_kernel_qdeadlinetimer.cpp b/src/corelib/doc/snippets/code/src_corelib_kernel_qdeadlinetimer.cpp
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+/****************************************************************************
+**
+** Copyright (C) 2018 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the documentation of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** BSD License Usage
+** Alternatively, you may use this file under the terms of the BSD license
+** as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of The Qt Company Ltd nor the names of its
+**     contributors may be used to endorse or promote products derived
+**     from this software without specific prior written permission.
+**
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+//! [0]
+    void executeOperation(int msecs)
+    {
+        QDeadlineTimer deadline(msecs);
+        do {
+            if (readFromDevice(deadline.remainingTime())
+                break;
+            waitForReadyRead(deadline);
+        } while (!deadline.hasExpired());
+    }
+//! [0]
+
+//! [1]
+    using namespace std::chrono;
+    using namespace std::chrono_literals;
+
+    QDeadlineTimer deadline(30s);
+    device->waitForReadyRead(deadline);
+    if (deadline.remainingTime<nanoseconds>() > 300ms)
+        cleanup();
+//! [1]
+
+//! [2]
+    using namespace std::chrono;
+    using namespace std::chrono_literals;
+    auto now = steady_clock::now();
+    QDeadlineTimer deadline(now + 1s);
+    Q_ASSERT(deadline == now + 1s);
+//! [2]
+
+//! [3]
+    using namespace std::chrono_literals;
+    QDeadlineTimer deadline(250ms);
+//! [3]
+
+//! [4]
+    using namespace std::chrono_literals;
+    deadline.setRemainingTime(250ms);
+//! [4]
+
+//! [5]
+    mutex.tryLock(deadline.remainingTime());
+//! [5]
+
+//! [6]
+    qint64 realTimeLeft = deadline.deadline();
+    if (realTimeLeft != (std::numeric_limits<qint64>::max)()) {
+        realTimeLeft -= QDeadlineTimer::current().deadline();
+        // or:
+        //QElapsedTimer timer;
+        //timer.start();
+        //realTimeLeft -= timer.msecsSinceReference();
+    }
+//! [6]
+
+//! [7]
+    qint64 realTimeLeft = deadline.deadlineNSecs();
+    if (realTimeLeft != std::numeric_limits<qint64>::max())
+        realTimeLeft -= QDeadlineTimer::current().deadlineNSecs();
+//! [7]
+
+//! [8]
+    return d1.deadlineNSecs() == d2.deadlineNSecs();
+//! [8]
+
+//! [9]
+    return d1.deadlineNSecs() != d2.deadlineNSecs();
+//! [9]
+
+//! [10]
+    return d1.deadlineNSecs() < d2.deadlineNSecs();
+//! [10]
+
+//! [11]
+    return d1.deadlineNSecs() <= d2.deadlineNSecs();
+//! [11]
+
+//! [12]
+    return d1.deadlineNSecs() > d2.deadlineNSecs();
+//! [12]
+
+//! [13]
+    return d1.deadlineNSecs() >= d2.deadlineNSecs();
+//! [13]