diff --git a/icu4c/source/i18n/datefmt.cpp b/icu4c/source/i18n/datefmt.cpp
index 825e73a742d..63b43aa67e2 100644
--- a/icu4c/source/i18n/datefmt.cpp
+++ b/icu4c/source/i18n/datefmt.cpp
@@ -60,7 +60,11 @@ DateFormat& DateFormat::operator=(const DateFormat& other)
         } else {
           fCalendar = NULL;
         }
-        fNumberFormat = (NumberFormat*)other.fNumberFormat->clone();
+        if(other.fNumberFormat) {
+          fNumberFormat = (NumberFormat*)other.fNumberFormat->clone();
+        } else {
+          fNumberFormat = NULL;
+        }
     }
     return *this;
 }
@@ -88,8 +92,8 @@ DateFormat::operator==(const Format& other) const
 
     return (this == fmt) ||
         ((getDynamicClassID() == other.getDynamicClassID()) &&
-         fCalendar->isEquivalentTo(*fmt->fCalendar) &&
-         (*fNumberFormat == *fmt->fNumberFormat));
+         fCalendar&&(fCalendar->isEquivalentTo(*fmt->fCalendar)) &&
+         (fNumberFormat&&(*fNumberFormat == *fmt->fNumberFormat)) );
 }
 
 //----------------------------------------------------------------------
diff --git a/icu4c/source/i18n/decimfmt.cpp b/icu4c/source/i18n/decimfmt.cpp
index d734effd985..9736937bc09 100644
--- a/icu4c/source/i18n/decimfmt.cpp
+++ b/icu4c/source/i18n/decimfmt.cpp
@@ -116,7 +116,10 @@ DecimalFormat::DecimalFormat(UErrorCode& status)
   fNegPrefixPattern(0), 
   fNegSuffixPattern(0),
   fCurrencyChoice(0),
-  fSymbols(0)
+  fSymbols(0), fFormatWidth(0),
+  fPad(0), fMinExponentDigits(0),
+  fRoundingIncrement(0),fMultiplier(0),
+  fGroupingSize(0),fGroupingSize2(0)
 {
     UParseError parseError;
     construct(status, parseError);
@@ -134,7 +137,10 @@ DecimalFormat::DecimalFormat(const UnicodeString& pattern,
   fNegPrefixPattern(0), 
   fNegSuffixPattern(0),
   fCurrencyChoice(0),
-  fSymbols(0)
+  fSymbols(0), fFormatWidth(0),
+  fPad(0), fMinExponentDigits(0),
+  fRoundingIncrement(0),fMultiplier(0),
+  fGroupingSize(0),fGroupingSize2(0)
 {
     UParseError parseError;
     construct(status, parseError, &pattern);
@@ -154,7 +160,10 @@ DecimalFormat::DecimalFormat(const UnicodeString& pattern,
   fNegPrefixPattern(0), 
   fNegSuffixPattern(0),
   fCurrencyChoice(0),
-  fSymbols(0)
+  fSymbols(0), fFormatWidth(0),
+  fPad(0), fMinExponentDigits(0),
+  fRoundingIncrement(0),fMultiplier(0),
+  fGroupingSize(0),fGroupingSize2(0)
 {
     UParseError parseError;
     if (symbolsToAdopt == NULL)
@@ -172,7 +181,10 @@ DecimalFormat::DecimalFormat(  const UnicodeString& pattern,
   fNegPrefixPattern(0), 
   fNegSuffixPattern(0),
   fCurrencyChoice(0),
-  fSymbols(0)
+  fSymbols(0), fFormatWidth(0),
+  fPad(0), fMinExponentDigits(0),
+  fRoundingIncrement(0),fMultiplier(0),
+  fGroupingSize(0),fGroupingSize2(0)
 {
     if (symbolsToAdopt == NULL)
         status = U_ILLEGAL_ARGUMENT_ERROR;
@@ -192,7 +204,10 @@ DecimalFormat::DecimalFormat(const UnicodeString& pattern,
   fNegPrefixPattern(0), 
   fNegSuffixPattern(0),
   fCurrencyChoice(0),
-  fSymbols(0)
+  fSymbols(0), fFormatWidth(0),
+  fPad(0), fMinExponentDigits(0),
+  fRoundingIncrement(0),fMultiplier(0),
+  fGroupingSize(0),fGroupingSize2(0)
 {
     UParseError parseError;
     construct(status, parseError, &pattern, new DecimalFormatSymbols(symbols));
diff --git a/icu4c/source/i18n/dtfmtsym.cpp b/icu4c/source/i18n/dtfmtsym.cpp
index e8f1a89fe72..fa6d1e8a003 100644
--- a/icu4c/source/i18n/dtfmtsym.cpp
+++ b/icu4c/source/i18n/dtfmtsym.cpp
@@ -575,11 +575,17 @@ DateFormatSymbols::initializeData(const Locale& locale, const char *type, UError
 
     /* In case something goes wrong, initialize all of the data to NULL. */
     fEras = NULL;
+    fErasCount = 0;
     fMonths = NULL;
+    fMonthsCount=0;
     fShortMonths = NULL;
+    fShortMonthsCount=0;
     fWeekdays = NULL;
+    fWeekdaysCount=0;
     fShortWeekdays = NULL;
+    fShortWeekdaysCount=0;
     fAmPms = NULL;
+    fAmPmsCount=0;
     fZoneStringsRowCount = 0;
     fZoneStringsColCount = 0;
     fZoneStrings = NULL;