diff --git a/java/toolgood.algorithm/src/main/java/toolgood/algorithm/internals/MathVisitor.java b/java/toolgood.algorithm/src/main/java/toolgood/algorithm/internals/MathVisitor.java
index 34eeb47..31285c6 100644
--- a/java/toolgood.algorithm/src/main/java/toolgood/algorithm/internals/MathVisitor.java
+++ b/java/toolgood.algorithm/src/main/java/toolgood/algorithm/internals/MathVisitor.java
@@ -2693,7 +2693,7 @@ public Operand visitDATEDIF_fun(final DATEDIF_funContext context) {
                 return Operand.Create((endDate.Year * 12 + endDate.Month - startDate.Year * 12 - startDate.Month - 1));
             }
         } else if (CharUtil.Equals(t, "d")) {
-            return Operand.Create(endDate.SUB(startDate).ToNumber().intValue());
+            return Operand.Create((endDate.ToNumber().subtract(startDate.ToNumber())).intValue());
         } else if (CharUtil.Equals(t, "yd")) {
             int day = endDate.DayOfYear() - startDate.DayOfYear();
             if (endDate.Year > startDate.Year && day < 0) {
diff --git a/java/toolgood.algorithm/src/test/java/toolgood/algorithm/Tests/IssuesTest.java b/java/toolgood.algorithm/src/test/java/toolgood/algorithm/Tests/IssuesTest.java
index 499942d..48b9abf 100644
--- a/java/toolgood.algorithm/src/test/java/toolgood/algorithm/Tests/IssuesTest.java
+++ b/java/toolgood.algorithm/src/test/java/toolgood/algorithm/Tests/IssuesTest.java
@@ -36,6 +36,9 @@ public void issues_27()
           AlgorithmEngine engine = new AlgorithmEngine();
           MyDate dt = engine.TryEvaluate("DATE(2024, 8, 1) + TIME(8, 0, 0)", MyDate.now());
           assertEquals(dt.toString(),  "2024-08-01 08:00:00");
+
+          MyDate dt2 = engine.TryEvaluate("DATE(2024, 8, 1, 16,0,0) - TIME(8, 0, 0)", MyDate.now());
+          assertEquals(dt2.toString(),  "2024-08-01 08:00:00");
       }
 
 }