diff --git a/icu4c/source/i18n/datefmt.cpp b/icu4c/source/i18n/datefmt.cpp
index 64f3466ef59..dc156b86d6e 100644
--- a/icu4c/source/i18n/datefmt.cpp
+++ b/icu4c/source/i18n/datefmt.cpp
@@ -277,9 +277,8 @@ DateFormat::createInstance()
 
 //----------------------------------------------------------------------
 DateFormat* U_EXPORT2
-DateFormat::createInstance(const UnicodeString& skeleton,
-                           UBool adjustFieldWidth,
-                           const Locale& locale) 
+DateFormat::createPatternInstance(const UnicodeString& skeleton,
+                                 const Locale& locale) 
 {
     UErrorCode status = U_ZERO_ERROR;
 
@@ -291,7 +290,6 @@ DateFormat::createInstance(const UnicodeString& skeleton,
         return NULL;
     }
 
-    // FIXME: use adjustFieldWidth later
     const UnicodeString pattern = dtptg->getBestPattern(skeleton, status);
     delete dtptg;
     if ( U_FAILURE(status) ) {
diff --git a/icu4c/source/i18n/dtitvfmt.cpp b/icu4c/source/i18n/dtitvfmt.cpp
index 1f9a42c0e45..fe152e0fff8 100644
--- a/icu4c/source/i18n/dtitvfmt.cpp
+++ b/icu4c/source/i18n/dtitvfmt.cpp
@@ -60,98 +60,22 @@ static const UChar gEarlierFirstPrefix[] = {LOW_E, LOW_A, LOW_R, LOW_L, LOW_I, L
 UOBJECT_DEFINE_RTTI_IMPLEMENTATION(DateIntervalFormat)
 
 
-DateIntervalFormat* U_EXPORT2
-DateIntervalFormat::createInstance(UErrorCode& status) {
-    return createInstance(Locale::getDefault(), status);
-}
-
-
-DateIntervalFormat* U_EXPORT2
-DateIntervalFormat::createInstance(const Locale& locale, UErrorCode& status) {
-    return createDateTimeIntervalInstance(DateFormat::kDefault, 
-                                          DateFormat::kDefault, locale, status);
-}
-
-
-DateIntervalFormat*  U_EXPORT2
-DateIntervalFormat::createDateIntervalInstance(DateFormat::EStyle style,
-                                               UErrorCode& status) {
-    return createDateIntervalInstance(style, Locale::getDefault(), status);
-}
-
-
-DateIntervalFormat*  U_EXPORT2
-DateIntervalFormat::createDateIntervalInstance(DateFormat::EStyle style,
-                                               const Locale& locale,
-                                               UErrorCode& status) {
-    if ( U_FAILURE(status) ) {
-        return NULL;
-    }
-    DateFormat* dtfmt = DateFormat::createDateInstance(style, locale);
-    DateIntervalInfo* dtitvinf = new DateIntervalInfo(locale, status);
-    // for CJK, even for non-short format,
-    // get skeleton will always return yMd.
-    // so, assign it directly instead of getting if from getSkeleton().
-    UnicodeString skeleton = UnicodeString(gDateFormatSkeleton[(int32_t)style]);
-    return create(dtfmt, dtitvinf, &skeleton, status);
-}
-
-
-DateIntervalFormat*  U_EXPORT2
-DateIntervalFormat::createTimeIntervalInstance(DateFormat::EStyle style,
-                                               UErrorCode& status) {
-    return createTimeIntervalInstance(style, Locale::getDefault(), status);
-}
-
-
-DateIntervalFormat*  U_EXPORT2
-DateIntervalFormat::createTimeIntervalInstance(DateFormat::EStyle style,
-                                               const Locale& locale,
-                                               UErrorCode& status) {
-    return createDateTimeIntervalInstance(DateFormat::kNone, style, locale, status);
-}
-
-
-DateIntervalFormat*  U_EXPORT2
-DateIntervalFormat::createDateTimeIntervalInstance(DateFormat::EStyle dateStyle,
-                                                   DateFormat::EStyle timeStyle,
-                                                   UErrorCode& status) {
-    return createDateTimeIntervalInstance(dateStyle, timeStyle, Locale::getDefault(), status);
-}
-
-
-DateIntervalFormat*  U_EXPORT2
-DateIntervalFormat::createDateTimeIntervalInstance(DateFormat::EStyle dateStyle,
-                                                   DateFormat::EStyle timeStyle,
-                                                   const Locale& locale,
-                                                   UErrorCode& status) {
-    if ( U_FAILURE(status) ) {
-        return NULL;
-    }
-    DateFormat* dtfmt = DateFormat::createDateTimeInstance(dateStyle, timeStyle, locale);
-    DateIntervalInfo* dtitvinf = new DateIntervalInfo(locale, status);
-    return create(dtfmt, dtitvinf, status);
-}
-
-
 
 DateIntervalFormat* U_EXPORT2
 DateIntervalFormat::createInstance(const UnicodeString& skeleton, 
-                                   UBool adjustFieldWidth,
                                    UErrorCode& status) {
-    return createInstance(skeleton, adjustFieldWidth, Locale::getDefault(), status);
+    return createInstance(skeleton, Locale::getDefault(), status);
 }
 
 
 DateIntervalFormat* U_EXPORT2
 DateIntervalFormat::createInstance(const UnicodeString& skeleton, 
-                                   UBool adjustFieldWidth,
                                    const Locale& locale, 
                                    UErrorCode& status) {
     if ( U_FAILURE(status) ) {
         return NULL;
     }
-    DateFormat* dtfmt = DateFormat::createInstance(skeleton, adjustFieldWidth, locale);
+    DateFormat* dtfmt = DateFormat::createPatternInstance(skeleton, locale);
 
 #ifdef DTITVFMT_DEBUG
     char result[1000];
@@ -173,16 +97,14 @@ DateIntervalFormat::createInstance(const UnicodeString& skeleton,
 
 DateIntervalFormat* U_EXPORT2
 DateIntervalFormat::createInstance(const UnicodeString& skeleton,
-                                   UBool adjustFieldWidth,
                                    DateIntervalInfo* dtitvinf,
                                    UErrorCode& status) {
-    return createInstance(skeleton, adjustFieldWidth, Locale::getDefault(), dtitvinf, status);
+    return createInstance(skeleton, Locale::getDefault(), dtitvinf, status);
 }
 
 
 DateIntervalFormat* U_EXPORT2
 DateIntervalFormat::createInstance(const UnicodeString& skeleton,
-                                   UBool adjustFieldWidth,
                                    const Locale& locale,
                                    DateIntervalInfo* dtitvinf,
                                    UErrorCode& status) {
@@ -190,7 +112,7 @@ DateIntervalFormat::createInstance(const UnicodeString& skeleton,
         delete dtitvinf;
         return NULL;
     }
-    DateFormat* dtfmt = DateFormat::createInstance(skeleton, adjustFieldWidth, locale);
+    DateFormat* dtfmt = DateFormat::createPatternInstance(skeleton, locale);
     return create(dtfmt, dtitvinf, &skeleton, status);
 }
 
diff --git a/icu4c/source/i18n/unicode/datefmt.h b/icu4c/source/i18n/unicode/datefmt.h
index 23a3afb09c9..d64dec578a9 100644
--- a/icu4c/source/i18n/unicode/datefmt.h
+++ b/icu4c/source/i18n/unicode/datefmt.h
@@ -417,7 +417,7 @@ public:
      * Create a date/time formatter from skeleton and a given locale.
      *
      * Users are encouraged to use the skeleton macros defined in udat.h.
-     * For example, MONTH_DOW_DAY_LONG_FORMAT, which is "MMMMEEEEd",
+     * For example, MONTH_WEEKDAY_DAY, which is "MMMMEEEEd",
      * and which means the pattern should have day, month, and day-of-week 
      * fields, and follow the long date format defined in date time pattern.
      * For example, for English, the full pattern should be 
@@ -428,16 +428,12 @@ public:
      * After which, this API will be replaced.
      *
      * @param skeleton  the skeleton on which date format based.
-     * @param adjustFieldWidth  whether adjust the skeleton field width or not.
-     *                          It is used for DateTimePatternGenerator to 
-     *                          adjust field width when get  
-     *                          full pattern from skeleton.
      * @param locale    the given locale.
      * @return          a simple date formatter which the caller owns.
      * @internal ICU 4.0
      */
-    static DateFormat* U_EXPORT2 createInstance(const UnicodeString& skeleton,
-                                                UBool adjustFieldWidth,
+    static DateFormat* U_EXPORT2 createPatternInstance(
+                                                const UnicodeString& skeleton,
                                                 const Locale& locale);
 
     /**
diff --git a/icu4c/source/i18n/unicode/dtitvfmt.h b/icu4c/source/i18n/unicode/dtitvfmt.h
index cac55920abf..d6526301166 100644
--- a/icu4c/source/i18n/unicode/dtitvfmt.h
+++ b/icu4c/source/i18n/unicode/dtitvfmt.h
@@ -85,23 +85,6 @@ U_NAMESPACE_BEGIN
  * </ol>
  *
  * <P>
- * There is a set of pre-defined static skeleton strings.
- * The skeletons defined consist of the desired calendar field set 
- * (for example,  DAY, MONTH, YEAR) and the format length (long, medium, short)
- * used in date time patterns.
- * 
- * For example, skeleton YEAR_MONTH_MEDIUM_FORMAT consists month and year,
- * and it's corresponding full pattern is medium format date pattern.
- * So, the skeleton is "yMMM", for English, the full pattern is "MMM yyyy", 
- * which is the format by removing DATE from medium date format.
- *
- * For example, skeleton YEAR_MONTH_DOW_DAY_MEDIUM_FORMAT consists day, month,
- * year, and day-of-week, and it's corresponding full pattern is the medium
- * format date pattern. So, the skeleton is "yMMMEEEd", for English,
- * the full pattern is "EEE, MMM d, yyyy", which is the medium date format
- * plus day-of-week.
- *
- * <P>
  * The calendar fields we support for interval formatting are:
  * year, month, date, day-of-week, am-pm, hour, hour-of-day, and minute.
  * Those calendar fields can be defined in the following order:
@@ -114,9 +97,10 @@ U_NAMESPACE_BEGIN
  * and "Feb 20, 2008" is year.
  *   
  * <P>
+ * There is a set of pre-defined static skeleton strings.
  * There are pre-defined interval patterns for those pre-defined skeletons
  * in locales' resource files.
- * For example, for a skeleton YEAR_MONTH_DAY_MEDIUM_FORMAT, which is  "yMMMd",
+ * For example, for a skeleton UDAT_YEAR_ABBR_MONTH_DAY, which is  "yMMMd",
  * in  en_US, if the largest different calendar field between date1 and date2 
  * is "year", the date interval pattern  is "MMM d, yyyy - MMM d, yyyy", 
  * such as "Jan 10, 2007 - Jan 10, 2008".
@@ -175,20 +159,12 @@ U_NAMESPACE_BEGIN
  * It can be instantiated in several ways:
  * <ul>
  * <li>
- * 1. create a date interval instance based on default or given locale plus 
- *    date format style FULL, or LONG, or MEDIUM, or SHORT.
- * 2. create a time interval instance based on default or given locale plus 
- *    time format style FULL, or LONG, or MEDIUM, or SHORT.
- * 3. create date and time interval instance based on default or given locale
- *    plus data and time format style
- * 4. create an instance using default or given locale plus default skeleton, 
- *    which  is "dMyhm"
- * 5. create an instance using default or given locale plus given skeleton.
+ * 1. create an instance using default or given locale plus given skeleton.
  *    Users are encouraged to created date interval formatter this way and 
  *    to use the pre-defined skeleton macros, such as
- *    YEAR_MONTH_SHORT_FORMAT, which consists the calendar fields and
+ *    UDAT_YEAR_NUM_MONTH, which consists the calendar fields and
  *    the format style. 
- * 6. create an instance using default or given locale plus given skeleton
+ * 2. create an instance using default or given locale plus given skeleton
  *    plus a given DateIntervalInfo.
  *    This factory method is for powerful users who want to provide their own 
  *    interval patterns. 
@@ -211,8 +187,8 @@ U_NAMESPACE_BEGIN
  *   DateInterval*  dtInterval = new DateInterval(1000*3600*24, 1000*3600*24*2);
  *   UErrorCode status = U_ZERO_ERROR;
  *   DateIntervalFormat* dtIntervalFmt = DateIntervalFormat::createInstance(
- *                           YEAR_MONTH_DAY_FULL_FORMAT, 
- *                           FALSE, Locale("en", "GB", ""), status);
+ *                           UDAT_YEAR_MONTH_DAY, 
+ *                           Locale("en", "GB", ""), status);
  *   UnicodeUnicodeString dateIntervalString;
  *   FieldPosition pos = 0;
  *   // formatting
@@ -225,233 +201,40 @@ U_NAMESPACE_BEGIN
 class U_I18N_API DateIntervalFormat : public Format {
 public:
 
-    /**
-     * Construct a DateIntervalFormat from default locale and
-     * default date time instance. 
-     *
-     * This is a convenient override of getDateTimeIntervalInstance() with
-     * the date and time style value as DEFAULT.
-     *
-     * @param status    output param set to success/failure code on exit
-     * @return          a date time interval formatter whick the caller owns.
-     * @draft ICU 4.0
-     */
-    static DateIntervalFormat* U_EXPORT2 createInstance(UErrorCode& status);
-
-
-    /**
-     * Construct a DateIntervalFormat using given locale and
-     * default date time instance.
-     *
-     * This is a convenient override of getDateTimeIntervalInstance() with
-     * the date and time style value as DEFAULT.
-     *
-     * @param locale    the given locale.
-     * @param status    output param set to success/failure code on exit
-     * @return          a date time interval formatter which the caller owns.
-     * @draft ICU 4.0
-     */
-    static DateIntervalFormat* U_EXPORT2 createInstance(const Locale& locale,
-                                                        UErrorCode& status);
-
-
-    /**
-     * Construct a DateIntervalFormat using default locale.
-     *
-     * This is a convenient override of 
-     * getDateIntervalInstance(int, ULocale)
-     * with the locale value as default locale.
-     *
-     * @param style     The given date formatting style. For example,
-     *                  SHORT for "M/d/yy" in the US locale.
-     * @param status    output param set to success/failure code on exit
-     * @return          a date time interval formatter whick the caller owns.
-     * @draft ICU 4.0
-     */
-    static DateIntervalFormat* U_EXPORT2 createDateIntervalInstance(
-                                                 DateFormat::EStyle style,
-                                                 UErrorCode& status);
-
-    /**
-     * Construct a DateIntervalFormat using given locale.
-     *
-     * The interval pattern is based on the date format only.
-     * For full date format, interval pattern is based on skeleton "EEEEdMMMMy".
-     * For long date format, interval pattern is based on skeleton "dMMMMy".
-     * For medium date format, interval pattern is based on skeleton "dMMMy".
-     * For short date format, interval pattern is based on skeleton "dMy".
-     *
-     * @param style     The given date formatting style. For example,
-     *                  SHORT for "M/d/yy" in the US locale.
-     * @param locale    The given locale.
-     * @param status    output param set to success/failure code on exit
-     * @return          a date time interval formatter whick the caller owns.
-     * @draft ICU 4.0
-     */
-    static DateIntervalFormat* U_EXPORT2 createDateIntervalInstance(
-                                DateFormat::EStyle style,
-                                const Locale& locale,
-                                UErrorCode& status);
-
-
-    /**
-     * Construct a DateIntervalFormat using default locale.
-     * The interval pattern is based on the time format only.
-     *
-     * This is the convenient override of getDateTimeIntervalInstance()
-     * with the date style as NONE and a given time style.
-     *
-     * @param style     The given time formatting style. For example,
-     *                  SHORT for "h:mm a" in the US locale.
-     * @param status    output param set to success/failure code on exit
-     * @return          a date time interval formatter whick the caller owns.
-     * @draft ICU 4.0
-     */
-    static DateIntervalFormat* U_EXPORT2 createTimeIntervalInstance(
-                                DateFormat::EStyle style,
-                                UErrorCode& status);
-
-
-
-    /**
-     * Construct a DateIntervalFormat using given locale.
-     * The interval pattern is based on the time format only.
-     *
-     * This is the convenient override of getDateTimeIntervalInstance()
-     * with the date style as NONE and a given time style.
-     *
-     * @param style     The given time formatting style. For example,
-     *                  SHORT for "h:mm a" in the US locale.
-     * @param locale    The given locale.
-     * @param status    output param set to success/failure code on exit
-     * @return          a date time interval formatter whick the caller owns.
-     * @draft ICU 4.0
-     */
-    static DateIntervalFormat* U_EXPORT2 createTimeIntervalInstance(
-                                DateFormat::EStyle style,
-                                const Locale& locale,
-                                UErrorCode& status);
-
-    /**
-     * Construct a DateIntervalFormat using default locale.
-     * The interval pattern is based on the date/time format.
-     *
-     * This is a convenient override of 
-     * getDateTimeIntervalInstance(int, int, ULocale)
-     * with the locale value as default locale.
-     *
-     * @param dateStyle The given date formatting style. For example,
-     *                  SHORT for "M/d/yy" in the US locale.
-     * @param timeStyle The given time formatting style. For example,
-     *                  SHORT for "h:mm a" in the US locale.
-     * @param status    output param set to success/failure code on exit
-     * @return          a date time interval formatter whick the caller owns.
-     * @draft ICU 4.0
-     */
-    static DateIntervalFormat* U_EXPORT2 createDateTimeIntervalInstance(
-                            DateFormat::EStyle dateStyle,
-                            DateFormat::EStyle timeStyle,
-                            UErrorCode& status);
-
-
-    /**
-     * Construct a DateIntervalFormat using given locale.
-     * The interval pattern is based on the date/time format.
-     * 
-     * The interval pattern is based on the date/time format.
-     *
-     * @param dateStyle The given date formatting style. For example,
-     *                  SHORT for "M/d/yy" in the US locale.
-     * @param timeStyle The given time formatting style. For example,
-     *                  SHORT for "h:mm a" in the US locale.
-     * @param locale    The given locale.
-     * @param status    output param set to success/failure code on exit
-     * @return          a date time interval formatter whick the caller owns.
-     * @draft ICU 4.0
-     */
-    static DateIntervalFormat* U_EXPORT2 createDateTimeIntervalInstance(
-                            DateFormat::EStyle dateStyle,
-                            DateFormat::EStyle timeStyle,
-                            const Locale& locale,
-                            UErrorCode& status);
-
-
     /**
      * Construct a DateIntervalFormat from skeleton and  the default locale.
      *
      * This is a convenient override of 
-     * createInstance(UnicodeString skeleton, UBool adjustFieldWidth, ULocale locale)  
+     * createInstance(const UnicodeString& skeleton, const Locale& locale,
+     *                UErrorCode&)  
      * with the value of locale as default locale.
      *
      * @param skeleton  the skeleton on which interval format based.
-     * @param adjustFieldWidth  whether adjust the skeleton field width or not
-     *                          It is used for DateTimePatternGenerator on 
-     *                          whether to adjust field width when get 
-     *                          full pattern from skeleton
      * @param status    output param set to success/failure code on exit
      * @return          a date time interval formatter whick the caller owns.
      * @draft ICU 4.0
      */
     static DateIntervalFormat* U_EXPORT2 createInstance(
                                                const UnicodeString& skeleton,
-                                               UBool adjustFieldWidth,
                                                UErrorCode& status);
 
     /**
      * Construct a DateIntervalFormat from skeleton and a given locale.
      *
-     * Following are the skeletons (defined in udate.h) having predefined 
+     * There are pre-defined skeletons (defined in udate.h) having predefined 
      * interval patterns in resource files.
      * Users are encouraged to use those macros.
      * For example: 
-     * DateIntervalFormat::createInstance(MONTH_DAY_FULL_FORMAT, FALSE, status) 
-     * 
-     * 
-     * #define YEAR_MONTH_DOW_DAY_LONG_FORMAT   "yMMMMEEEEd"
-     * #define YEAR_MONTH_DAY_LONG_FORMAT       "yMMMMd"
-     * #define MONTH_DAY_LONG_FORMAT            "MMMMd"
-     * #define YEAR_MONTH_LONG_FORMAT           "yMMMM"
-     * #define MONTH_DOW_DAY_LONG_FORMAT        "MMMMEEEEd"
-     * #define YEAR_MONTH_DOW_DAY_MEDIUM_FORMAT "yMMMEEEd"
-     * #define YEAR_MONTH_DAY_MEDIUM_FORMAT     "yMMMd"
-     * #define MONTH_DAY_MEDIUM_FORMAT          "MMMd"
-     * #define YEAR_MONTH_MEDIUM_FORMAT         "yMMM"
-     * #define MONTH_DOW_DAY_MEDIUM_FORMAT      "MMMEEEd"
-     * #define YEAR_MONTH_DOW_DAY_SHORT_FORMAT  "yMEEEd"
-     * #define YEAR_MONTH_DAY_SHORT_FORMAT      "yMd"
-     * #define MONTH_DAY_SHORT_FORMAT           "Md"
-     * #define YEAR_MONTH_SHORT_FORMAT          "yM"
-     * #define MONTH_DOW_DAY_SHORT_FORMAT       "MEEEd"
-     * #define DAY_ONLY_SHORT_FORMAT            "d"
-     * #define DOW_DAY_SHORT_FORMAT             "EEEd"
-     * #define YEAR_ONLY_SHORT_FORMAT           "y"
-     * #define MONTH_ONLY_SHORT_FORMAT          "M"
-     * #define MONTH_ONLY_MEDIUM_FORMAT         "MMM"
-     * #define MONTH_ONLY_LONG_FORMAT           "MMMM"
-     * #define HOUR_MINUTE_FORMAT               "hm"
-     * #define HOUR_MINUTE_GENERAL_TZ_FORMAT    "hmv"
-     * #define HOUR_MINUTE_DAYLIGNT_TZ_FORMAT   "hmz"
-     * #define HOUR_ONLY_FORMAT                 "h"
-     * #define HOUR_GENERAL_TZ_FORMAT           "hv"
-     * #define HOUR_DAYLIGNT_TZ_FORMAT          "hz"
+     * DateIntervalFormat::createInstance(UDAT_MONTH_DAY, status) 
      *
-     * Those skeletons have pre-defined interval patterns in resource files.
-     * Users are encouraged to use them. 
-     * For example:
-     * DateIntervalFormat.createInstance(MONTH_DAY_FULL_FORMAT, false, loc);
-     * 
      * The given Locale provides the interval patterns.
-     * For example, for en_GB, if skeleton is YEAR_MONTH_DOW_DAY_MEDIUM_FORMAT,
+     * For example, for en_GB, if skeleton is UDAT_YEAR_ABBR_MONTH_WEEKDAY_DAY,
      * which is "yMMMEEEd",
      * the interval patterns defined in resource file to above skeleton are:
      * "EEE, d MMM, yyyy - EEE, d MMM, yyyy" for year differs,
      * "EEE, d MMM - EEE, d MMM, yyyy" for month differs,
      * "EEE, d - EEE, d MMM, yyyy" for day differs,
      * @param skeleton  the skeleton on which interval format based.
-     * @param adjustFieldWidth  whether adjust the skeleton field width or not
-     *                          It is used for DateTimePatternGenerator on 
-     *                          whether to adjust field width when get 
-     *                          full pattern from skeleton
      * @param locale    the given locale
      * @param status    output param set to success/failure code on exit
      * @return          a date time interval formatter whick the caller owns.
@@ -460,20 +243,16 @@ public:
 
     static DateIntervalFormat* U_EXPORT2 createInstance(
                                                const UnicodeString& skeleton,
-                                               UBool adjustFieldWidth,
                                                const Locale& locale,
                                                UErrorCode& status);
 
-
-
-
     /**
      * Construct a DateIntervalFormat from skeleton
      *  DateIntervalInfo, and default locale.
      *
      * This is a convenient override of
-     * createInstance(UnicodeString skeleton, UBool adjustFieldWidth, 
-     *             ULocale locale, DateIntervalInfo dtitvinf)
+     * createInstance(const UnicodeString& skeleton, const Locale& locale, 
+     *                DateIntervalInfo* dtitvinf, UErrorCode&)
      * with the locale value as default locale.
      *
      * Note: the DateIntervalFormat takes ownership of 
@@ -481,10 +260,6 @@ public:
      * Caller should not delete them.
      *
      * @param skeleton  the skeleton on which interval format based.
-     * @param adjustFieldWidth  whether adjust the skeleton field width or not
-     *                          It is used for DateTimePatternGenerator on 
-     *                          whether to adjust field width when get 
-     *                          full pattern from skeleton
      * @param dtitvinf  the DateIntervalInfo object to be adopted.
      * @param status    output param set to success/failure code on exit
      * @return          a date time interval formatter whick the caller owns.
@@ -492,7 +267,6 @@ public:
      */
     static DateIntervalFormat* U_EXPORT2 createInstance(
                                               const UnicodeString& skeleton,
-                                              UBool adjustFieldWidth,
                                               DateIntervalInfo* dtitvinf,
                                               UErrorCode& status);
 
@@ -500,44 +274,11 @@ public:
      * Construct a DateIntervalFormat from skeleton
      * a DateIntervalInfo, and the given locale.
      *
-     * Following are the skeletons (defined in udate.h) having predefined 
+     * There are pre-defined skeletons (defined in udate.h) having predefined 
      * interval patterns in resource files.
      * Users are encouraged to use those macros.
      * For example: 
-     * DateIntervalFormat::createInstance(MONTH_DAY_FULL_FORMAT, FALSE, status) 
-     * 
-     * #define YEAR_MONTH_DOW_DAY_LONG_FORMAT   "yMMMMEEEEd"
-     * #define YEAR_MONTH_DAY_LONG_FORMAT       "yMMMMd"
-     * #define MONTH_DAY_LONG_FORMAT            "MMMMd"
-     * #define YEAR_MONTH_LONG_FORMAT           "yMMMM"
-     * #define MONTH_DOW_DAY_LONG_FORMAT        "MMMMEEEEd"
-     * #define YEAR_MONTH_DOW_DAY_MEDIUM_FORMAT "yMMMEEEd"
-     * #define YEAR_MONTH_DAY_MEDIUM_FORMAT     "yMMMd"
-     * #define MONTH_DAY_MEDIUM_FORMAT          "MMMd"
-     * #define YEAR_MONTH_MEDIUM_FORMAT         "yMMM"
-     * #define MONTH_DOW_DAY_MEDIUM_FORMAT      "MMMEEEd"
-     * #define YEAR_MONTH_DOW_DAY_SHORT_FORMAT  "yMEEEd"
-     * #define YEAR_MONTH_DAY_SHORT_FORMAT      "yMd"
-     * #define MONTH_DAY_SHORT_FORMAT           "Md"
-     * #define YEAR_MONTH_SHORT_FORMAT          "yM"
-     * #define MONTH_DOW_DAY_SHORT_FORMAT       "MEEEd"
-     * #define DAY_ONLY_SHORT_FORMAT            "d"
-     * #define DOW_DAY_SHORT_FORMAT             "EEEd"
-     * #define YEAR_ONLY_SHORT_FORMAT           "y"
-     * #define MONTH_ONLY_SHORT_FORMAT          "M"
-     * #define MONTH_ONLY_MEDIUM_FORMAT         "MMM"
-     * #define MONTH_ONLY_LONG_FORMAT           "MMMM"
-     * #define HOUR_MINUTE_FORMAT               "hm"
-     * #define HOUR_MINUTE_GENERAL_TZ_FORMAT    "hmv"
-     * #define HOUR_MINUTE_DAYLIGNT_TZ_FORMAT   "hmz"
-     * #define HOUR_ONLY_FORMAT                 "h"
-     * #define HOUR_GENERAL_TZ_FORMAT           "hv"
-     * #define HOUR_DAYLIGNT_TZ_FORMAT          "hz"
-     *
-     * Those skeletons have pre-defined interval patterns in resource files.
-     * Users are encouraged to use them. 
-     * For example:
-     * DateIntervalFormat.createInstance(MONTH_DAY_FULL_FORMAT, false, loc,itvinf);
+     * DateIntervalFormat::createInstance(UDAT_MONTH_DAY, status) 
      *
      * the DateIntervalInfo provides the interval patterns.
      *
@@ -555,10 +296,6 @@ public:
      * Caller should not delete them.
      *
      * @param skeleton  the skeleton on which interval format based.
-     * @param adjustFieldWidth  whether adjust the skeleton field width or not
-     *                          It is used for DateTimePatternGenerator on 
-     *                          whether to adjust field width when get 
-     *                          full pattern from skeleton
      * @param locale    the given locale
      * @param dtitvinf  the DateIntervalInfo object to be adopted.
      * @param status    output param set to success/failure code on exit
@@ -567,7 +304,6 @@ public:
      */
     static DateIntervalFormat* U_EXPORT2 createInstance(
                                               const UnicodeString& skeleton,
-                                              UBool adjustFieldWidth,
                                               const Locale& locale,
                                               DateIntervalInfo* dtitvinf,
                                               UErrorCode& status);
diff --git a/icu4c/source/i18n/unicode/dtitvinf.h b/icu4c/source/i18n/unicode/dtitvinf.h
index 5aa7c5d79cc..538cc715adc 100644
--- a/icu4c/source/i18n/unicode/dtitvinf.h
+++ b/icu4c/source/i18n/unicode/dtitvinf.h
@@ -70,23 +70,6 @@ static UBool U_CALLCONV hashTableValueComparator(UHashTok val1, UHashTok val2) ;
  * </ol>
  *
  * <P>
- * There is a set of pre-defined static skeleton strings.
- * The skeletons defined consist of the desired calendar field set 
- * (for example,  DAY, MONTH, YEAR) and the format length (long, medium, short)
- * used in date time patterns.
- * 
- * For example, skeleton YEAR_MONTH_MEDIUM_FORMAT consists month and year,
- * and it's corresponding full pattern is medium format date pattern.
- * So, the skeleton is "yMMM", for English, the full pattern is "MMM yyyy", 
- * which is the format by removing DATE from medium date format.
- *
- * For example, skeleton YEAR_MONTH_DOW_DAY_MEDIUM_FORMAT consists day, month,
- * year, and day-of-week, and it's corresponding full pattern is the medium
- * format date pattern. So, the skeleton is "yMMMEEEd", for English,
- * the full pattern is "EEE, MMM d, yyyy", which is the medium date format
- * plus day-of-week.
- *
- * <P>
  * The calendar fields we support for interval formatting are:
  * year, month, date, day-of-week, am-pm, hour, hour-of-day, and minute.
  * Those calendar fields can be defined in the following order:
@@ -99,9 +82,10 @@ static UBool U_CALLCONV hashTableValueComparator(UHashTok val1, UHashTok val2) ;
  * and "Feb 20, 2008" is year.
  *   
  * <P>
+ * There is a set of pre-defined static skeleton strings.
  * There are pre-defined interval patterns for those pre-defined skeletons
  * in locales' resource files.
- * For example, for a skeleton YEAR_MONTH_DAY_MEDIUM_FORMAT, which is  "yMMMd",
+ * For example, for a skeleton UDAT_YEAR_ABBR_MONTH_DAY, which is  "yMMMd",
  * in  en_US, if the largest different calendar field between date1 and date2 
  * is "year", the date interval pattern  is "MMM d, yyyy - MMM d, yyyy", 
  * such as "Jan 10, 2007 - Jan 10, 2008".
diff --git a/icu4c/source/test/intltest/dtifmtts.cpp b/icu4c/source/test/intltest/dtifmtts.cpp
index 86f49b545e3..e1a17d97b5f 100644
--- a/icu4c/source/test/intltest/dtifmtts.cpp
+++ b/icu4c/source/test/intltest/dtifmtts.cpp
@@ -52,123 +52,12 @@ void DateIntervalFormatTest::runIndexedTest( int32_t index, UBool exec, const ch
  */
 void DateIntervalFormatTest::testAPI() {
 
-    // ======= Test create instance with default local
-    UErrorCode status = U_ZERO_ERROR;
-    logln("Testing DateIntervalFormat create instance with defaule locale");
- 
-    DateIntervalFormat* dtitvfmt = DateIntervalFormat::createInstance(status);
-    if(U_FAILURE(status)) {
-        dataerrln("ERROR: Could not create DateIntervalFormat (default) - exitting");
-        return;
-    } else {
-        delete dtitvfmt;
-    }
-
-    // ======= Test create instance with given locale
-    status = U_ZERO_ERROR;
-    logln("Testing DateIntervalFormat create instance with given locale");
- 
-    dtitvfmt = DateIntervalFormat::createInstance(Locale::getGerman(), status);
-    if(U_FAILURE(status)) {
-        dataerrln("ERROR: Could not create DateIntervalFormat (given locale) - exitting");
-        return;
-    } else {
-        delete dtitvfmt;
-    }
-
-    /* ====== Test create date interval instance with default locale and 
-     * ====== date format style
-     */
-    status = U_ZERO_ERROR;
-    logln("Testing DateIntervalFormat create date instance with default locale and date format style");
- 
-    dtitvfmt = DateIntervalFormat::createDateIntervalInstance(DateFormat::kFull, status);
-    if(U_FAILURE(status)) {
-        dataerrln("ERROR: Could not create DateIntervalFormat (default local + date style) - exitting");
-        return;
-    } else {
-        delete dtitvfmt;
-    }
-
-    /* ====== Test create date interval instance with given locale and 
-     * ====== date format style
-     */
-    status = U_ZERO_ERROR;
-    logln("Testing DateIntervalFormat create date instance with given locale and date format style");
- 
-    dtitvfmt = DateIntervalFormat::createDateIntervalInstance(DateFormat::kFull, Locale::getFrench(), status);
-    if(U_FAILURE(status)) {
-        dataerrln("ERROR: Could not create DateIntervalFormat (local + date style) - exitting");
-        return;
-    } else {
-        delete dtitvfmt;
-    }
-
-
-    /* ====== Test create time interval instance with default locale and 
-     * ====== time format style
-     */
-    status = U_ZERO_ERROR;
-    logln("Testing DateIntervalFormat create time instance with default locale and time format style");
-
-    dtitvfmt = DateIntervalFormat::createTimeIntervalInstance(DateFormat::kLong, status);
-    if(U_FAILURE(status)) {
-        dataerrln("ERROR: Could not create DateIntervalFormat (default local + time style) - exitting");
-        return;
-    } else {
-        delete dtitvfmt;
-    }
-
-    /* ====== Test create time interval instance with given locale and 
-     * ====== time format style
-     */
-    status = U_ZERO_ERROR;
-    logln("Testing DateIntervalFormat create time instance with given locale and time format style");
-
-    dtitvfmt = DateIntervalFormat::createTimeIntervalInstance(DateFormat::kLong, Locale::getItalian(), status);
-    if(U_FAILURE(status)) {
-        dataerrln("ERROR: Could not create DateIntervalFormat (local + time style) - exitting");
-        return;
-    } else {
-        delete dtitvfmt;
-    }
-
-    /* ====== Test create date time interval instance with default locale and 
-     * ====== date time format style
-     */
-    status = U_ZERO_ERROR;
-    logln("Testing DateIntervalFormat create date time instance with iven locale and date time format style");
- 
-    dtitvfmt = DateIntervalFormat::createDateTimeIntervalInstance(DateFormat::kMedium, DateFormat::kShort,  status);
-    if(U_FAILURE(status)) {
-        dataerrln("ERROR: Could not create DateIntervalFormat (default locale + date time style) - exitting");
-        return;
-    } else {
-        delete dtitvfmt;
-    }
-
-
-    /* ====== Test create date time interval instance with given locale and 
-     * ====== date time format style
-     */
-    status = U_ZERO_ERROR;
-    logln("Testing DateIntervalFormat create date time instance with given locale and date time format style");
- 
-    dtitvfmt = DateIntervalFormat::createDateTimeIntervalInstance(DateFormat::kMedium, DateFormat::kShort, Locale::getItalian(), status);
-    if(U_FAILURE(status)) {
-        dataerrln("ERROR: Could not create DateIntervalFormat (local + date time style) - exitting");
-        return;
-    } else {
-        delete dtitvfmt;
-    }
-
-
     /* ====== Test create interval instance with default locale and skeleton
      */
-    status = U_ZERO_ERROR;
+    UErrorCode status = U_ZERO_ERROR;
     logln("Testing DateIntervalFormat create instance with default locale and skeleton");
  
-    dtitvfmt = DateIntervalFormat::createInstance(YEAR_MONTH_DAY_LONG_FORMAT, FALSE, status);
+    DateIntervalFormat* dtitvfmt = DateIntervalFormat::createInstance(YEAR_MONTH_DAY_LONG_FORMAT, status);
     if(U_FAILURE(status)) {
         dataerrln("ERROR: Could not create DateIntervalFormat (skeleton + default locale) - exitting");
         return;
@@ -182,7 +71,7 @@ void DateIntervalFormatTest::testAPI() {
     status = U_ZERO_ERROR;
     logln("Testing DateIntervalFormat create instance with given locale and skeleton");
  
-    dtitvfmt = DateIntervalFormat::createInstance(YEAR_MONTH_DAY_LONG_FORMAT, FALSE, Locale::getJapanese(), status);
+    dtitvfmt = DateIntervalFormat::createInstance(YEAR_MONTH_DAY_LONG_FORMAT, Locale::getJapanese(), status);
     if(U_FAILURE(status)) {
         dataerrln("ERROR: Could not create DateIntervalFormat (skeleton + locale) - exitting");
         return;
@@ -198,7 +87,7 @@ void DateIntervalFormatTest::testAPI() {
  
     DateIntervalInfo* dtitvinf = new DateIntervalInfo(Locale::getSimplifiedChinese(), status);
 
-    dtitvfmt = DateIntervalFormat::createInstance("EEEdMMMyhms", FALSE, dtitvinf, status);
+    dtitvfmt = DateIntervalFormat::createInstance("EEEdMMMyhms", dtitvinf, status);
     if(U_FAILURE(status)) {
         dataerrln("ERROR: Could not create DateIntervalFormat (skeleton + DateIntervalInfo + default locale) - exitting");
         return;
@@ -214,7 +103,7 @@ void DateIntervalFormatTest::testAPI() {
  
     dtitvinf = new DateIntervalInfo(Locale::getSimplifiedChinese(), status);
 
-    dtitvfmt = DateIntervalFormat::createInstance("EEEdMMMyhms", FALSE, Locale::getSimplifiedChinese(), dtitvinf, status);
+    dtitvfmt = DateIntervalFormat::createInstance("EEEdMMMyhms", Locale::getSimplifiedChinese(), dtitvinf, status);
     if(U_FAILURE(status)) {
         dataerrln("ERROR: Could not create DateIntervalFormat (skeleton + DateIntervalInfo + locale) - exitting");
         return;
@@ -462,66 +351,11 @@ void DateIntervalFormatTest::expect(const char** data, int32_t data_length,
             if (!assertSuccess("parse", ec)) return;
             DateInterval dtitv(date, date_2);
 
-            for ( DateFormat::EStyle style = DateFormat::kFull; 
-                  style  < DateFormat::kDateOffset;
-                  style = (DateFormat::EStyle)(style+1) ) {
-                DateIntervalFormat* dtitvfmt = DateIntervalFormat::createDateIntervalInstance(style, loc, ec);
-                FieldPosition pos=0;
-                if (!assertSuccess("createDateInstance", ec)) return;
-                dtitvfmt->format(&dtitv, str.remove(), pos, ec);
-                if (!assertSuccess("format", ec)) return;
-#ifdef DTIFMTTS_DEBUG
-                sprintf(mesg, "date interval, style = %d\n", style);
-                PRINTMESG(mesg)
-                str.extract(0,  str.length(), result, "UTF-8");
-                sprintf(mesg, "interval date: %s\n", result);
-                PRINTMESG(mesg)
-#endif
-                delete dtitvfmt;
-            } 
- 
-            for ( DateFormat::EStyle style = DateFormat::kFull; 
-                  style  < DateFormat::kDateOffset;
-                  style = (DateFormat::EStyle)(style+1) ) {
-                DateIntervalFormat* dtitvfmt = DateIntervalFormat::createTimeIntervalInstance(style, loc, ec);
-
-                if (!assertSuccess("createTimeInstance", ec)) return;
-                FieldPosition pos=0;
-                dtitvfmt->format(&dtitv, str.remove(), pos, ec);
-                if (!assertSuccess("format", ec)) return;
-#ifdef DTIFMTTS_DEBUG
-                sprintf(mesg, "time interval, style = %d\n", style);
-                PRINTMESG(mesg)
-                str.extract(0,  str.length(), result, "UTF-8");
-                sprintf(mesg, "interval date: %s\n", result);
-                PRINTMESG(mesg)
-#endif
-                delete dtitvfmt;
-            } 
- 
-            for ( DateFormat::EStyle style = DateFormat::kFull; 
-                  style  < DateFormat::kDateOffset;
-                  style = (DateFormat::EStyle)(style+1) ) {
-                DateIntervalFormat* dtitvfmt = DateIntervalFormat::createDateTimeIntervalInstance(style, style, loc, ec);
-                if (!assertSuccess("createDateTimeInstance", ec)) return;
-                FieldPosition pos=0;
-                dtitvfmt->format(&dtitv, str.remove(), pos, ec);
-                if (!assertSuccess("format", ec)) return;
-#ifdef DTIFMTTS_DEBUG
-                sprintf(mesg, "date time interval, style = %d\n", style);
-                PRINTMESG(mesg)
-                str.extract(0,  str.length(), result, "UTF-8");
-                sprintf(mesg, "interval date: %s\n", result);
-                PRINTMESG(mesg)
-#endif
-                delete dtitvfmt;
-            } 
-
             for ( uint32_t skeletonIndex = 0; 
                   skeletonIndex < ARRAY_SIZE(skeleton); 
                   ++skeletonIndex ) {
                 const UnicodeString& oneSkeleton = skeleton[skeletonIndex];
-                DateIntervalFormat* dtitvfmt = DateIntervalFormat::createInstance(oneSkeleton, FALSE, loc, ec);
+                DateIntervalFormat* dtitvfmt = DateIntervalFormat::createInstance(oneSkeleton, loc, ec);
                 if (!assertSuccess("createInstance(skeleton)", ec)) return;
                 FieldPosition pos=0;
                 dtitvfmt->format(&dtitv, str.remove(), pos, ec);
@@ -545,7 +379,7 @@ void DateIntervalFormatTest::expect(const char** data, int32_t data_length,
             if (!assertSuccess("DateIntervalInfo::setIntervalPattern", ec)) return;
             dtitvinf->setIntervalPattern(YEAR_MONTH_DAY_MEDIUM_FORMAT, UCAL_HOUR_OF_DAY, "yyyy MMM d HH:mm - HH:mm", ec);
             if (!assertSuccess("DateIntervalInfo::setIntervalPattern", ec)) return;
-            DateIntervalFormat* dtitvfmt = DateIntervalFormat::createInstance(YEAR_MONTH_DAY_MEDIUM_FORMAT, FALSE, loc, dtitvinf, ec);
+            DateIntervalFormat* dtitvfmt = DateIntervalFormat::createInstance(YEAR_MONTH_DAY_MEDIUM_FORMAT, loc, dtitvinf, ec);
             if (!assertSuccess("createInstance(skeleton,dtitvinf)", ec)) return;
             FieldPosition pos=0;
             dtitvfmt->format(&dtitv, str.remove(), pos, ec);