diff --git a/src/blackmisc/pqphysicalquantity.cpp b/src/blackmisc/pqphysicalquantity.cpp
index db2207e08..25d4b03ce 100644
--- a/src/blackmisc/pqphysicalquantity.cpp
+++ b/src/blackmisc/pqphysicalquantity.cpp
@@ -151,8 +151,8 @@ namespace BlackMisc
         }
 
         /*
-             * Multiply operator
-             */
+         * Multiply operator
+         */
         template <class MU, class PQ> PQ CPhysicalQuantity<MU, PQ>::operator *(double factor) const
         {
             PQ copy = *derived();
@@ -306,6 +306,16 @@ namespace BlackMisc
             this->m_value = json.value("value").toDouble();
         }
 
+        /*
+         * Parse from string
+         */
+        template <class MU, class PQ> void CPhysicalQuantity<MU, PQ>::parseFromString(const QString &value)
+        {
+            PQ parsed = CPqString::parse<PQ>(value);
+            this->m_value = parsed.m_value;
+            this->m_unit = parsed.m_unit;
+        }
+
         /*
          * metaTypeId
          */
@@ -320,7 +330,6 @@ namespace BlackMisc
         template <class MU, class PQ> bool CPhysicalQuantity<MU, PQ>::isA(int metaTypeId) const
         {
             if (metaTypeId == qMetaTypeId<PQ>()) { return true; }
-
             return this->CValueObject::isA(metaTypeId);
         }
 
diff --git a/src/blackmisc/pqphysicalquantity.h b/src/blackmisc/pqphysicalquantity.h
index 40f2ccf29..138268c1d 100644
--- a/src/blackmisc/pqphysicalquantity.h
+++ b/src/blackmisc/pqphysicalquantity.h
@@ -94,6 +94,9 @@ namespace BlackMisc
             //! Is quantity null?
             bool isNull() const { return this->m_unit.isNull(); }
 
+            //! Set null
+            void setNull() { this->m_unit = MU::nullUnit(); }
+
             //! Value in given unit
             double value(const MU &unit) const;
 
@@ -116,7 +119,13 @@ namespace BlackMisc
                 }
             }
 
-            //! \brief Rounded value in given unit
+            //! Set by other PQ
+            void set(const PQ &pq)
+            {
+                this->m_value = pq.m_value;
+                this->m_unit = pq.m_unit;
+            }
+
             //! Rounded value in given unit
             double valueRounded(const MU &unit, int digits = -1) const;
 
@@ -225,6 +234,9 @@ namespace BlackMisc
             //! \copydoc CValueObject::fromJson
             virtual void fromJson(const QJsonObject &json) override;
 
+            //! \copydoc CValueObject::parseFromString
+            virtual void parseFromString(const QString &value) override;
+
             //! Register metadata of unit and quantity
             static void registerMetadata();
         };
diff --git a/src/blackmisc/pqtime.cpp b/src/blackmisc/pqtime.cpp
new file mode 100644
index 000000000..9bb16ef93
--- /dev/null
+++ b/src/blackmisc/pqtime.cpp
@@ -0,0 +1,49 @@
+#include "pqtime.h"
+
+namespace BlackMisc
+{
+    namespace PhysicalQuantities
+    {
+        CTime::CTime(const QTime &time) : CPhysicalQuantity(0, CTimeUnit::nullUnit())
+        {
+            int seconds = QTime().secsTo(time);
+            CTime converted(seconds, CTimeUnit::s());
+            converted.setUnit(CTimeUnit::hms());
+            this->set(converted);
+        }
+
+        CTime::CTime(const QString &time) : CPhysicalQuantity(0, CTimeUnit::nullUnit())
+        {
+            CTime parsed;
+            parsed.parseFromString(time);
+            this->set(parsed);
+        }
+
+        void CTime::parseFromString(const QString &time)
+        {
+            Q_ASSERT(time.length() == 5 || time.length() == 8);
+            QTime t;
+            if (time.length() == 5)
+                t = QTime::fromString("hh:mm");
+            else if (time.length() == 8)
+                t = QTime::fromString("hh:mm:ss");
+            CTime parsed(t);
+            if (time.length() == 5)
+                parsed.setUnit(CTimeUnit::hrmin());
+            else if (time.length() == 8)
+                parsed.setUnit(CTimeUnit::hms());
+            else
+                parsed.setUnit(CTimeUnit::nullUnit()); // indicates invalid
+            this->set(parsed);
+        }
+
+        QTime CTime::toQTime() const
+        {
+            CTime copy(*this);
+            copy.setUnit(CTimeUnit::hms());
+            QString s = copy.toQString(false);
+            QTime t = QTime::fromString(s, "hh:mm:ss");
+            return t;
+        }
+    }
+}
diff --git a/src/blackmisc/pqtime.h b/src/blackmisc/pqtime.h
index 8585d66bb..09d38750d 100644
--- a/src/blackmisc/pqtime.h
+++ b/src/blackmisc/pqtime.h
@@ -36,6 +36,13 @@ namespace BlackMisc
 
             //! Destructor
             virtual ~CTime() {}
+
+            //! From string hh:mm, or hh:mm:ss
+            void parseFromString(const QString &time);
+
+            //! To Qt time
+            QTime toQTime() const;
+
         };
 
     } // namespace