diff --git a/ClosedXML_Tests/Excel/Styles/NumberFormatTests.cs b/ClosedXML_Tests/Excel/Styles/NumberFormatTests.cs
index 87ab21a..ed012b3 100644
--- a/ClosedXML_Tests/Excel/Styles/NumberFormatTests.cs
+++ b/ClosedXML_Tests/Excel/Styles/NumberFormatTests.cs
@@ -31,5 +31,21 @@
                 Assert.AreEqual("yy-MM-dd", ws.Cell("E1").Style.DateFormat.Format);
             }
         }
+
+        [Test]
+        public void TestExcelNumberFormats()
+        {
+            using (var wb = new XLWorkbook())
+            {
+                var ws = wb.AddWorksheet("Sheet1");
+                var c = ws.FirstCell()
+                    .SetValue(41573.875)
+                    .SetDataType(XLDataType.DateTime);
+
+                c.Style.NumberFormat.SetFormat("m/d/yy\\ h:mm;@");
+
+                Assert.AreEqual("10/26/13 21:00", c.GetFormattedString());
+            }
+        }
     }
 }