diff --git a/icu4c/source/test/intltest/caltztst.cpp b/icu4c/source/test/intltest/caltztst.cpp
index b9c438671de..3d50ce954c2 100644
--- a/icu4c/source/test/intltest/caltztst.cpp
+++ b/icu4c/source/test/intltest/caltztst.cpp
@@ -152,6 +152,25 @@ CalendarTimeZoneTest::dateToString(UDate d, UnicodeString& str)
     return str;
 }
 
+UnicodeString&
+CalendarTimeZoneTest::dateToString(UDate d, UnicodeString& str,
+                                   const TimeZone& tz)
+{
+    str.remove();
+    DateFormat* format = getDateFormat();
+    if (format == 0)
+    {
+        str += "DATE_FORMAT_FAILURE";
+        return str;
+    }
+    TimeZone* save = format->getTimeZone().clone();
+    format->setTimeZone(tz);
+    format->format(d, str);
+    format->adoptTimeZone(save);
+    releaseDateFormat(format);
+    return str;
+}
+
 // Utility methods to create a date.  This is useful for converting Java constructs
 // which create a Date object.
 UDate
diff --git a/icu4c/source/test/intltest/caltztst.h b/icu4c/source/test/intltest/caltztst.h
index badf9e363c0..f9367830947 100644
--- a/icu4c/source/test/intltest/caltztst.h
+++ b/icu4c/source/test/intltest/caltztst.h
@@ -33,6 +33,7 @@ protected:
     // Tries to mimic the Java Date.toString() format.
     UnicodeString  dateToString(UDate d);
     UnicodeString& dateToString(UDate d, UnicodeString& str);
+    UnicodeString& dateToString(UDate d, UnicodeString& str, const TimeZone& z);
 
     // Utility methods to create a date.  This is useful for converting Java constructs
     // which create a Date object.  Returns a Date in the current local time.