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diff --git a/include/tools/duration.hxx b/include/tools/duration.hxx
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#pragma once
+
+#include <tools/time.hxx>
+
+class DateTime;
+
+namespace tools
+{
+/** Duration in days and time. Can be negative in which case days is 0 and time
+    is negative or both days and time are negative.
+*/
+class SAL_WARN_UNUSED TOOLS_DLLPUBLIC Duration
+{
+public:
+    Duration() {}
+
+    /** Assumes that DateTime are normalized and there are no Time out-of-range
+        field values. */
+    Duration(const ::DateTime& rStart, const ::DateTime& rEnd);
+
+    /** Time can be a limited duration as well. We don't cater for out-of-range
+        minutes and seconds values here though. */
+    Duration(const Time& rStart, const Time& rEnd);
+
+    constexpr static sal_uInt64 kAccuracyEpsilonNanoseconds = 300;
+    constexpr static sal_uInt64 kAccuracyEpsilonNanosecondsMicroseconds = 999;
+
+    /** Difference in days, like DateTime()-DateTime().
+
+        Can also be used to round a date+time value to, for example, microseconds.
+
+        @param  nAccuracyEpsilonNanoseconds
+                Round for example by 1 nanosecond if it's just 1 off to a
+                second,  i.e. 0999999999 or 0000000001. This can be loosened if
+                necessary. For example, if fTimeInDays is a date+time in
+                "today's" range with a significant seconds resolution, an
+                accuracy epsilon (=unsharpness) of ~300 is required. Hence default.
+                Must be 0 <= nAccuracyEpsilonNanoseconds <= Time::nanoSecPerSec - 1.
+     */
+    explicit Duration(double fTimeInDays,
+                      sal_uInt64 nAccuracyEpsilonNanoseconds = kAccuracyEpsilonNanoseconds);
+
+    /** Time can be a limited duration as well and can have out-of-range
+        values, it will be normalized. Sign of both days and Time must be equal
+        unless one is 0. */
+    Duration(sal_Int32 nDays, const Time& rTime);
+
+    /** Individual time values can be out-of-range, all will be normalized.
+        Additionally, the resulting time overall hour value is not restricted
+        to sal_uInt16 like it is with Time, as values >=24 flow over into days.
+        For a negative duration only a negative nDays can be given, thus a
+        negative duration of less than one day is not possible. */
+    Duration(sal_Int32 nDays, sal_uInt32 nHours, sal_uInt32 nMinutes, sal_uInt32 nSeconds,
+             sal_uInt64 nNanoseconds);
+
+    bool IsNegative() const { return mnDays < 0 || maTime.GetTime() < 0; }
+    sal_Int32 GetDays() const { return mnDays; }
+    const Time& GetTime() const { return maTime; }
+    double GetInDays() const { return static_cast<double>(GetDays()) + GetTime().GetTimeInDays(); }
+
+    /** Whether a duration is set. */
+    operator bool() const { return maTime.GetTime() != 0 || mnDays != 0; }
+
+    /** Unary minus. */
+    Duration operator-() const;
+
+    /** Add a duration to this instance. */
+    Duration& Add(const Duration& rDuration, bool& rbOverflow);
+
+    /** Get multiple of duration. */
+    Duration Mult(sal_Int32 nMult, bool& rbOverflow) const;
+
+private:
+    /** Internal days and Time values. */
+    Duration(sal_Int32 nDays, sal_Int64 nTime);
+
+    /** Prerequisite: mnDays is already set. */
+    void Normalize(sal_uInt64 nHours, sal_uInt64 nMinutes, sal_uInt64 nSeconds,
+                   sal_uInt64 nNanoseconds, bool bNegative);
+
+    /** Prerequisite: mnDays is already correctly set and absolute value of
+        nanoseconds less than one day. */
+    void ApplyTime(sal_Int64 nNS);
+
+    /** Prerequisite: mnDays is already correctly set and Time hour values
+        are adjusted. */
+    void SetTimeDiff(const Time& rStart, const Time& rEnd);
+
+private:
+    Time maTime = Time(0);
+    sal_Int32 mnDays = 0;
+};
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab cinoptions=b1,g0,N-s cinkeys+=0=break: */