src/share/classes/sun/text/resources/cs/FormatData_cs.java

@@ -139,10 +139,21 @@
                     "\u010ct", // abb Thursday
                     "P\u00e1", // abb Friday
                     "So" // abb Saturday
                 }
             },
+            { "DayNarrows",
+                new String[] {
+                    "N",
+                    "P",
+                    "\u00da",
+                    "S",
+                    "\u010c",
+                    "P",
+                    "S",
+                }
+            },
             { "AmPmMarkers",
                 new String[] {
                     "dop.", // am marker
                     "odp." // pm marker
                 }