diff --git a/icu4j/main/classes/core/src/com/ibm/icu/util/Calendar.java b/icu4j/main/classes/core/src/com/ibm/icu/util/Calendar.java
index c41f74aa00f..9730ad6a833 100644
--- a/icu4j/main/classes/core/src/com/ibm/icu/util/Calendar.java
+++ b/icu4j/main/classes/core/src/com/ibm/icu/util/Calendar.java
@@ -4241,10 +4241,33 @@ public abstract class Calendar implements Serializable, Cloneable, Comparable<Ca
         WeekData data = cachedLocaleData.get(locale);
 
         if (data == null) {  /* cache miss */
-
+            // Since week and weekend data is territory based instead of language based,
+            // we may need to tweak the locale that we are using to try to get the appropriate
+            // values, using the following logic:
+            // 1). If the locale has a language but no territory, use the territory as defined by 
+            //     the likely subtags.
+            // 2). If the locale has a script designation then we ignore it,
+            //     then remove it ( i.e. "en_Latn_US" becomes "en_US" )
+ 
+            ULocale useLocale;
+            ULocale min = ULocale.minimizeSubtags(locale);
+            if ( locale.getCountry().length() == 0 || 
+                 locale.getScript().length() > 0 && min.getScript().length() == 0 ) {
+                ULocale max = ULocale.addLikelySubtags(locale);
+                ULocale.Builder builder = new ULocale.Builder();
+                builder.setLocale(max);
+                if (min.getScript().length() == 0) {
+                    builder.setScript(null);
+                }
+                useLocale = builder.build();
+            } else {
+                useLocale = locale;
+            }
+ 
             CalendarData calData = new CalendarData(locale, getType());
-            int[] dateTimeElements = calData.get("DateTimeElements").getIntVector();
-            int[] weekend = calData.get("weekend").getIntVector();
+            CalendarData wkData = new CalendarData(useLocale, getType());
+            int[] dateTimeElements = wkData.get("DateTimeElements").getIntVector();
+            int[] weekend = wkData.get("weekend").getIntVector();
             data = new WeekData(dateTimeElements[0],dateTimeElements[1],
                                 weekend[0],
                                 weekend[1],
diff --git a/icu4j/main/shared/data/icudata.jar b/icu4j/main/shared/data/icudata.jar
index be5a160648e..8f2eb985e84 100755
--- a/icu4j/main/shared/data/icudata.jar
+++ b/icu4j/main/shared/data/icudata.jar
@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:977342bb1aba0c12fd661aa4476b63cad1e5603e99b1abaf4eec276b4e21740e
-size 7469197
+oid sha256:6c7451af00c4f9bcf0a42b126ff9170c525eb83849f01ff34245daf947875765
+size 7080727
diff --git a/icu4j/main/tests/core/src/com/ibm/icu/dev/test/format/DateFormatRegressionTest.java b/icu4j/main/tests/core/src/com/ibm/icu/dev/test/format/DateFormatRegressionTest.java
index 541f727e1f4..1a75e199768 100644
--- a/icu4j/main/tests/core/src/com/ibm/icu/dev/test/format/DateFormatRegressionTest.java
+++ b/icu4j/main/tests/core/src/com/ibm/icu/dev/test/format/DateFormatRegressionTest.java
@@ -901,17 +901,17 @@ public class DateFormatRegressionTest extends com.ibm.icu.dev.test.TestFmwk {
         final PatternAndResult[] tests = {
             new PatternAndResult( "dd MMM yyyy GGG",   "02 Jul 2008 AD" ),
             new PatternAndResult( "dd MMM yyyy GGGGG", "02 Jul 2008 A" ),
-            new PatternAndResult( "e dd MMM yyyy",     "3 02 Jul 2008" ),
-            new PatternAndResult( "ee dd MMM yyyy",    "03 02 Jul 2008" ),
-            new PatternAndResult( "c dd MMM yyyy",     "3 02 Jul 2008" ),
-            new PatternAndResult( "cc dd MMM yyyy",    "3 02 Jul 2008" ),
+            new PatternAndResult( "e dd MMM yyyy",     "4 02 Jul 2008" ),
+            new PatternAndResult( "ee dd MMM yyyy",    "04 02 Jul 2008" ),
+            new PatternAndResult( "c dd MMM yyyy",     "4 02 Jul 2008" ),
+            new PatternAndResult( "cc dd MMM yyyy",    "4 02 Jul 2008" ),
             new PatternAndResult( "eee dd MMM yyyy",   "Wed 02 Jul 2008" ),
             new PatternAndResult( "EEE dd MMM yyyy",   "Wed 02 Jul 2008" ),
             new PatternAndResult( "EE dd MMM yyyy",    "Wed 02 Jul 2008" ),
             new PatternAndResult( "eeee dd MMM yyyy",  "Wednesday 02 Jul 2008" ),
             new PatternAndResult( "eeeee dd MMM yyyy", "W 02 Jul 2008" ),
-            new PatternAndResult( "e ww YYYY",         "3 27 2008" ),
-            new PatternAndResult( "c ww YYYY",         "3 27 2008" ),
+            new PatternAndResult( "e ww YYYY",         "4 27 2008" ),
+            new PatternAndResult( "c ww YYYY",         "4 27 2008" ),
         };
         ULocale loc = ULocale.ENGLISH;
         TimeZone tz = TimeZone.getTimeZone("America/Los_Angeles");