diff --git a/javakdb/src/main/java/com/kx/c.java b/javakdb/src/main/java/com/kx/c.java
index 79374c1..f0b8a3f 100644
--- a/javakdb/src/main/java/com/kx/c.java
+++ b/javakdb/src/main/java/com/kx/c.java
@@ -497,7 +497,10 @@ public Minute(int x){
     }
     @Override
     public String toString(){
-      return i==ni?"":i2(i/60)+":"+i2(i%60);
+      if(i==ni)
+        return "";
+      int a=Math.abs(i);
+      return (i<0?"-":"")+i2(a/60)+":"+i2(a%60);
     }
     @Override
     public boolean equals(final Object o){
@@ -527,7 +530,10 @@ public Second(int x){
     }
     @Override
     public String toString(){
-      return i==ni?"":new Minute(i/60).toString()+':'+i2(i%60);
+      if(i==ni)
+        return "";
+      int a=Math.abs(i);
+      return (i<0?"-":"")+new Minute(a/60).toString()+':'+i2(a%60);
     }
     @Override
     public boolean equals(final Object o){
diff --git a/javakdb/src/test/java/com/kx/CTest.java b/javakdb/src/test/java/com/kx/CTest.java
index 7660d4f..582c5d9 100644
--- a/javakdb/src/test/java/com/kx/CTest.java
+++ b/javakdb/src/test/java/com/kx/CTest.java
@@ -979,6 +979,12 @@ public void testMinuteToString()
     {
         c.Minute mon = new c.Minute(22);
         Assert.assertEquals("00:22", mon.toString());
+        mon = new c.Minute(1500);
+        Assert.assertEquals("25:00", mon.toString()); // minute can exceed 24h
+        mon = new c.Minute(-30);
+        Assert.assertEquals("-00:30", mon.toString());
+        mon = new c.Minute(-90);
+        Assert.assertEquals("-01:30", mon.toString());
         mon = new c.Minute(Integer.MIN_VALUE);
         Assert.assertEquals("", mon.toString());
     }
@@ -1022,6 +1028,12 @@ public void testSecondToString()
     {
         c.Second mon = new c.Second(22);
         Assert.assertEquals("00:00:22", mon.toString());
+        mon = new c.Second(90000);
+        Assert.assertEquals("25:00:00", mon.toString()); // second can exceed 24h
+        mon = new c.Second(-30);
+        Assert.assertEquals("-00:00:30", mon.toString());
+        mon = new c.Second(-3661);
+        Assert.assertEquals("-01:01:01", mon.toString());
         mon = new c.Second(Integer.MIN_VALUE);
         Assert.assertEquals("", mon.toString());
     }