diff --git a/CHANGELOG.txt b/CHANGELOG.txt
index f77e45d..8b03e41 100644
--- a/CHANGELOG.txt
+++ b/CHANGELOG.txt
@@ -1,3 +1,10 @@
+------------------------------------------------------------------------------
+  qSharp 2.0.3 [2014.06.10]
+------------------------------------------------------------------------------
+
+  - Fix: behaviour of toString and fromString methods in QTime, QSecond
+         and QMinute types for dates outside of 0-24 hours scope
+
 ------------------------------------------------------------------------------
   qSharp 2.0.2 [2014.06.06]
 ------------------------------------------------------------------------------
diff --git a/qSharp/src/QMinute.cs b/qSharp/src/QMinute.cs
index 3122f0e..5b96acd 100644
--- a/qSharp/src/QMinute.cs
+++ b/qSharp/src/QMinute.cs
@@ -24,7 +24,6 @@ namespace qSharp
     /// </summary>
     public struct QMinute : IDateTime
     {
-        private const string DateFormat = "HH:mm";
         private const string NullRepresentation = "0Nu";
 
         private DateTime datetime;
@@ -79,7 +78,10 @@ public override string ToString()
         {
             if (Value != int.MinValue)
             {
-                return ToDateTime().ToString(DateFormat);
+                int minutes = Math.Abs(Value);
+                int hours = minutes / 60;
+
+                return String.Format("{0}{1:00}:{2:00}", Value < 0 ? "-" : "", hours, minutes % 60);
             }
             return NullRepresentation;
         }
@@ -91,9 +93,18 @@ public override string ToString()
         /// <returns>a QMinute instance</returns>
         public static QMinute FromString(string date)
         {
+            if (date == null || date.Length == 0 || date.Equals(NullRepresentation))
+            {
+                return new QMinute(int.MinValue);
+            }
+
             try
             {
-                return date == null || date.Length == 0 || date.Equals(NullRepresentation) ? new QMinute(int.MinValue) : new QMinute(DateTime.ParseExact(date, DateFormat, CultureInfo.InvariantCulture));
+                String[] parts = date.Split(':');
+                int hours = int.Parse(parts[0]);
+                int minutes = int.Parse(parts[1]);
+
+                return new QMinute((minutes + 60 * Math.Abs(hours)) * (hours > 0 ? 1 : -1));
             }
             catch (Exception e)
             {
diff --git a/qSharp/src/QSecond.cs b/qSharp/src/QSecond.cs
index 8451fad..69c5850 100644
--- a/qSharp/src/QSecond.cs
+++ b/qSharp/src/QSecond.cs
@@ -24,7 +24,6 @@ namespace qSharp
     /// </summary>
     public struct QSecond : IDateTime
     {
-        private const string DateFormat = "HH:mm:ss";
         private const string NullRepresentation = "0Nv";
 
         private DateTime datetime;
@@ -79,7 +78,11 @@ public override string ToString()
         {
             if (Value != int.MinValue)
             {
-                return ToDateTime().ToString(DateFormat);
+                int seconds = Math.Abs(Value);
+                int minutes = seconds / 60;
+                int hours = minutes / 60;
+
+                return String.Format("{0}{1:00}:{2:00}:{3:00}", Value < 0 ? "-" : "", hours, minutes % 60, seconds % 60);
             }
             return NullRepresentation;
         }
@@ -91,9 +94,19 @@ public override string ToString()
         /// <returns>a QSecond instance</returns>
         public static QSecond FromString(string date)
         {
+            if (date == null || date.Length == 0 || date.Equals(NullRepresentation))
+            {
+                return new QSecond(int.MinValue);
+            }
+
             try
             {
-                return date == null || date.Length == 0 || date.Equals(NullRepresentation) ? new QSecond(int.MinValue) : new QSecond(DateTime.ParseExact(date, DateFormat, CultureInfo.InvariantCulture));
+                String[] parts = date.Split(':');
+                int hours = int.Parse(parts[0]);
+                int minutes = int.Parse(parts[1]);
+                int seconds = int.Parse(parts[2]);
+
+                return new QSecond((seconds + 60 * minutes + 3600 * Math.Abs(hours)) * (hours > 0 ? 1 : -1));
             }
             catch (Exception e)
             {
diff --git a/qSharp/src/QTime.cs b/qSharp/src/QTime.cs
index c40204e..8eaff61 100644
--- a/qSharp/src/QTime.cs
+++ b/qSharp/src/QTime.cs
@@ -24,7 +24,6 @@ namespace qSharp
     /// </summary>
     public struct QTime : IDateTime
     {
-        private const string DateFormat = "HH:mm:ss.fff";
         private const string NullRepresentation = "0Nt";
 
         private DateTime datetime;
@@ -79,7 +78,12 @@ public override string ToString()
         {
             if (Value != int.MinValue)
             {
-                return ToDateTime().ToString(DateFormat);
+                int millis = Math.Abs(Value);
+                int seconds = millis / 1000;
+                int minutes = seconds / 60;
+                int hours = minutes / 60;
+
+                return String.Format("{0}{1:00}:{2:00}:{3:00}.{4:000}", Value < 0 ? "-" : "", hours, minutes % 60, seconds % 60, millis % 1000);
             }
             return NullRepresentation;
         }
@@ -91,9 +95,19 @@ public override string ToString()
         /// <returns>a QTime instance</returns>
         public static QTime FromString(string date)
         {
+            if (date == null || date.Length == 0 || date.Equals(NullRepresentation))
+            {
+                return new QTime(int.MinValue);
+            }
+
             try
             {
-                return date == null || date.Length == 0 || date.Equals(NullRepresentation) ? new QTime(int.MinValue) : new QTime(DateTime.ParseExact(date, DateFormat, CultureInfo.InvariantCulture));
+                String[] parts = date.Split(new char[]{ ':' , '.'});
+                int hours = int.Parse(parts[0]);
+                int minutes = int.Parse(parts[1]);
+                int seconds = int.Parse(parts[2]);
+                int millis = int.Parse(parts[3]);
+                return new QTime((millis + 1000 * seconds + 60000 * minutes + 3600000 * Math.Abs(hours)) * (hours > 0 ? 1 : -1));
             }
             catch (Exception e)
             {
diff --git a/qSharp/test/DateTimeTest.cs b/qSharp/test/DateTimeTest.cs
index b4154b8..fcb10bb 100644
--- a/qSharp/test/DateTimeTest.cs
+++ b/qSharp/test/DateTimeTest.cs
@@ -106,6 +106,9 @@ public void testQMinuteToString()
             Assert.AreEqual("13:30", new QMinute(810).ToString());
             Assert.AreEqual("23:59", new QMinute(1439).ToString());
 
+            Assert.AreEqual("-13:30", new QMinute(-810).ToString());
+            Assert.AreEqual("52:23", new QMinute(3143).ToString());
+
             Assert.AreEqual("0Nu", new QMinute(int.MinValue).ToString());
         }
 
@@ -116,6 +119,9 @@ public void testQMinuteFromString()
             Assert.AreEqual(new QMinute(810), QMinute.FromString("13:30"));
             Assert.AreEqual(new QMinute(1439), QMinute.FromString("23:59"));
 
+            Assert.AreEqual(new QMinute(-810), QMinute.FromString("-13:30"));
+            Assert.AreEqual(new QMinute(3143), QMinute.FromString("52:23"));
+
             Assert.AreEqual(new QMinute(int.MinValue), QMinute.FromString(null));
             Assert.AreEqual(new QMinute(int.MinValue), QMinute.FromString(""));
             Assert.AreEqual(new QMinute(int.MinValue), QMinute.FromString("0Nu"));
@@ -172,6 +178,9 @@ public void testQSecondToString()
             Assert.AreEqual("13:30:13", new QSecond(48613).ToString());
             Assert.AreEqual("23:59:59", new QSecond(86399).ToString());
 
+            Assert.AreEqual("51:46:39", new QSecond(186399).ToString());
+            Assert.AreEqual("-23:59:59", new QSecond(-86399).ToString());
+
             Assert.AreEqual("0Nv", new QSecond(int.MinValue).ToString());
         }
 
@@ -182,6 +191,9 @@ public void testQSecondFromString()
             Assert.AreEqual(new QSecond(48613), QSecond.FromString("13:30:13"));
             Assert.AreEqual(new QSecond(86399), QSecond.FromString("23:59:59"));
 
+            Assert.AreEqual(new QSecond(186399), QSecond.FromString("51:46:39"));
+            Assert.AreEqual(new QSecond(-86399), QSecond.FromString("-23:59:59"));
+
             Assert.AreEqual(new QSecond(int.MinValue), QSecond.FromString(null));
             Assert.AreEqual(new QSecond(int.MinValue), QSecond.FromString(""));
             Assert.AreEqual(new QSecond(int.MinValue), QSecond.FromString("0Nv"));
@@ -202,6 +214,9 @@ public void testQTimeToString()
             Assert.AreEqual("13:30:13.000", new QTime(48613000).ToString());
             Assert.AreEqual("23:59:59.000", new QTime(86399000).ToString());
 
+            Assert.AreEqual("51:46:39.050", new QTime(186399050).ToString());
+            Assert.AreEqual("-23:59:59.100", new QTime(-86399100).ToString());
+
             Assert.AreEqual("0Nt", new QTime(int.MinValue).ToString());
         }
 
@@ -212,6 +227,9 @@ public void testQTimeFromString()
             Assert.AreEqual(new QTime(0), QTime.FromString("00:00:00.000"));
             Assert.AreEqual(new QTime(86399000), QTime.FromString("23:59:59.000"));
 
+            Assert.AreEqual(new QTime(186399001), QTime.FromString("51:46:39.001"));
+            Assert.AreEqual(new QTime(-86399000), QTime.FromString("-23:59:59.000"));
+
             Assert.AreEqual(new QTime(int.MinValue), QTime.FromString(null));
             Assert.AreEqual(new QTime(int.MinValue), QTime.FromString(""));
             Assert.AreEqual(new QTime(int.MinValue), QTime.FromString("0Nt"));