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

*** 139,148 ****
--- 139,159 ----
                      "\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
                  }