add day number property

Author: 9il

source/mir/date.d

@@ -2337,6 +2337,15 @@ public:
         return date;
     }
 
+    /++
+    Returns;
+        Day Of Gregorian Calendar Minus One
+    +/
+    int dayNumber() @safe pure nothrow @nogc const @property
+    {
+        return _dayNumber;
+    }
+
     /++
         The Xth day of the Gregorian Calendar that this $(LREF Date) is on.
      +/