Do not build headers from empty time stamps.

zaaReloaded2/Formatter/TimePointFormatter.cs

@@ -30,15 +30,37 @@ namespace zaaReloaded2.Formatter
     {
         #region Static methods
 
+        /// <summary>
+        /// Builds a header paragraph from a Date,
+        /// but only if the Date structure has a value.
+        /// </summary>
         public static string DateHeader(DateTime date)
+        {
+            if (date != _nullTimeStamp.Date)
             {
                 return FormatHeader(date.ToShortDateString());
             }
+            else
+            {
+                return String.Empty;
+            }
+        }
 
+        /// <summary>
+        /// Builds a header paragraph from a DateTime structure,
+        /// but only if the DateTime structure has a value.
+        /// </summary>
         public static string DateAndTimeHeader(DateTime dateTime)
+        {
+            if (dateTime != _nullTimeStamp)
             {
                 return FormatHeader(dateTime.ToString());
             }
+            else
+            {
+                return String.Empty;
+            }
+        }
 
         #endregion
 
@@ -119,5 +141,11 @@ namespace zaaReloaded2.Formatter
         }
 
         #endregion
+
+        #region Fields
+
+        static readonly DateTime _nullTimeStamp = new DateTime();
+
+        #endregion
     }
 }