diff --git a/icu4j/main/tests/core/src/com/ibm/icu/dev/test/calendar/IBMCalendarTest.java b/icu4j/main/tests/core/src/com/ibm/icu/dev/test/calendar/IBMCalendarTest.java
index 0e58f9d23ad..8be6e47f357 100644
--- a/icu4j/main/tests/core/src/com/ibm/icu/dev/test/calendar/IBMCalendarTest.java
+++ b/icu4j/main/tests/core/src/com/ibm/icu/dev/test/calendar/IBMCalendarTest.java
@@ -2104,8 +2104,8 @@ public class IBMCalendarTest extends CalendarTestFmwk {
 
     public void checkConsistency(String locale) {
         boolean quick = getExhaustiveness() <= 5;
-        // Check 3 years in quick mode and 8000 years in exhaustive mode.
-        int numOfDaysToTest = (quick ? 3 * 365 : 8000 * 365);
+        // Check 3 years in quick mode and 6000 years in exhaustive mode.
+        int numOfDaysToTest = (quick ? 3 * 365 : 6000 * 365);
         int msInADay = 1000*60*60*24;
 
         // g is just for debugging messages.
@@ -2115,6 +2115,9 @@ public class IBMCalendarTest extends CalendarTestFmwk {
 
         Calendar r = (Calendar)base.clone();
         int lastDay = 1;
+        String type = base.getType();
+        boolean ignoreOrdinaryMonth12Bug = (!quick) && (type.equals("chinese") || type.equals("dangi"));
+        boolean ignoreICU22258 = (!quick) && type.equals("dangi");
         for (int j = 0; j < numOfDaysToTest; j++, test.setTime(test.getTime() - msInADay)) {
             g.setTime(test);
             base.clear();
@@ -2159,6 +2162,19 @@ public class IBMCalendarTest extends CalendarTestFmwk {
             }
             Date result = r.getTime();
             if (!test.equals(result)) {
+                if (ignoreOrdinaryMonth12Bug && base.get(Calendar.ORDINAL_MONTH) == 12) {
+                    logKnownIssue("ICU-22230", "Problem December in Leap Year");
+                    continue;
+                }
+                int year = base.get(Calendar.YEAR);
+                int month = base.get(Calendar.MONTH) + 1;
+                int date = base.get(Calendar.DATE);
+                if (ignoreICU22258 && (year == 4 || year == 34) && month == 12 && date == 30) {
+                    logKnownIssue("ICU-22258",
+                                  "Dangi Problem in 1988/2/17=>4/12/30 and 1958/2/18=>34/12/30");
+                    continue;
+                }
+
                 errln("Round trip conversion produces different time from " + test + " to  " +
                     result + " delta: " + (result.getTime() - test.getTime()) +
                     " Gregorian(e=" + g.get(Calendar.ERA) + " " + g.get(Calendar.YEAR) + "/" +