diff --git a/ext/intl/common/common_date.cpp b/ext/intl/common/common_date.cpp
index 2a52b7e63be5c..e4f442a8195ad 100644
--- a/ext/intl/common/common_date.cpp
+++ b/ext/intl/common/common_date.cpp
@@ -94,12 +94,11 @@ U_CFUNC TimeZone *timezone_convert_datetimezone(int type,
 }
 /* }}} */
 
-U_CFUNC int intl_datetime_decompose(zval *z, double *millis, TimeZone **tz,
+U_CFUNC zend_result intl_datetime_decompose(zend_object *obj, double *millis, TimeZone **tz,
 		intl_error *err, const char *func)
 {
-	zval	retval;
-	zval	zfuncname;
 	char	*message;
+	php_date_obj *datetime = php_date_obj_from_obj(obj);
 
 	if (err && U_FAILURE(err->code)) {
 		return FAILURE;
@@ -109,35 +108,35 @@ U_CFUNC int intl_datetime_decompose(zval *z, double *millis, TimeZone **tz,
 		*millis = ZEND_NAN;
 	}
 	if (tz) {
-		*tz = NULL;
+		*tz = nullptr;
 	}
 
 	if (millis) {
-		php_date_obj *datetime;
-
-		ZVAL_STRING(&zfuncname, "getTimestamp");
-		if (call_user_function(NULL, z, &zfuncname, &retval, 0, NULL)
-				!= SUCCESS || Z_TYPE(retval) != IS_LONG) {
-			spprintf(&message, 0, "%s: error calling ::getTimeStamp() on the "
-					"object", func);
-			intl_errors_set(err, U_INTERNAL_PROGRAM_ERROR,
-				message, 1);
+		auto getTimestampMethod = static_cast<zend_function *>(zend_hash_str_find_ptr(&obj->ce->function_table, ZEND_STRL("gettimestamp")));
+		zval retval;
+
+		ZEND_ASSERT(getTimestampMethod && "DateTimeInterface is sealed and thus must have this method");
+		zend_call_known_function(getTimestampMethod, obj, obj->ce, &retval, 0, nullptr, nullptr);
+
+		/* An exception has occurred */
+		if (Z_TYPE(retval) == IS_UNDEF) {
+			return FAILURE;
+		}
+		// TODO: Remove this when DateTimeInterface::getTimestamp() no longer has a tentative return type
+		if (Z_TYPE(retval) != IS_LONG) {
+			spprintf(&message, 0, "%s: %s::getTimestamp() did not return an int", func, ZSTR_VAL(obj->ce->name));
+			intl_errors_set(err, U_INTERNAL_PROGRAM_ERROR, message, 1);
 			efree(message);
-			zval_ptr_dtor(&zfuncname);
 			return FAILURE;
 		}
 
-		datetime = Z_PHPDATE_P(z);
 		*millis = U_MILLIS_PER_SECOND * (double)Z_LVAL(retval) + (datetime->time->us / 1000);
-		zval_ptr_dtor(&zfuncname);
 	}
 
 	if (tz) {
-		php_date_obj *datetime;
-		datetime = Z_PHPDATE_P(z);
 		if (!datetime->time) {
 			spprintf(&message, 0, "%s: the %s object is not properly "
-					"initialized", func, ZSTR_VAL(Z_OBJCE_P(z)->name));
+					"initialized", func, ZSTR_VAL(obj->ce->name));
 			intl_errors_set(err, U_ILLEGAL_ARGUMENT_ERROR,
 				message, 1);
 			efree(message);
@@ -198,7 +197,7 @@ U_CFUNC double intl_zval_to_millis(zval *z, intl_error *err, const char *func)
 		break;
 	case IS_OBJECT:
 		if (instanceof_function(Z_OBJCE_P(z), php_date_get_interface_ce())) {
-			intl_datetime_decompose(z, &rv, NULL, err, func);
+			intl_datetime_decompose(Z_OBJ_P(z), &rv, nullptr, err, func);
 		} else if (instanceof_function(Z_OBJCE_P(z), Calendar_ce_ptr)) {
 			Calendar_object *co = Z_INTL_CALENDAR_P(z);
 			if (co->ucal == NULL) {
diff --git a/ext/intl/common/common_date.h b/ext/intl/common/common_date.h
index c5818106ba3dc..e9fac3a02bd57 100644
--- a/ext/intl/common/common_date.h
+++ b/ext/intl/common/common_date.h
@@ -29,8 +29,7 @@ U_CDECL_END
 using icu::TimeZone;
 
 U_CFUNC TimeZone *timezone_convert_datetimezone(int type, void *object, int is_datetime, intl_error *outside_error, const char *func);
-U_CFUNC int intl_datetime_decompose(zval *z, double *millis, TimeZone **tz,
-		intl_error *err, const char *func);
+U_CFUNC zend_result intl_datetime_decompose(zend_object *obj, double *millis, TimeZone **tz, intl_error *err, const char *func);
 
 #endif
 
diff --git a/ext/intl/dateformat/dateformat_format_object.cpp b/ext/intl/dateformat/dateformat_format_object.cpp
index c5dc9acd9d58b..81490c62fd5e2 100644
--- a/ext/intl/dateformat/dateformat_format_object.cpp
+++ b/ext/intl/dateformat/dateformat_format_object.cpp
@@ -64,8 +64,8 @@ static bool valid_format(zval *z) {
 
 U_CFUNC PHP_FUNCTION(datefmt_format_object)
 {
-	zval				*object,
-						*format = NULL;
+	zend_object			*object;
+	zval				*format = NULL;
 	char			       *locale_str	= NULL;
 	size_t				locale_len;
 	bool				pattern		= false;
@@ -78,7 +78,7 @@ U_CFUNC PHP_FUNCTION(datefmt_format_object)
 						timeStyle = DateFormat::kDefault;
 
 	ZEND_PARSE_PARAMETERS_START(1, 3)
-		Z_PARAM_OBJECT(object)
+		Z_PARAM_OBJ(object)
 		Z_PARAM_OPTIONAL
 		Z_PARAM_ZVAL(format)
 		Z_PARAM_STRING_OR_NULL(locale_str, locale_len)
@@ -149,9 +149,9 @@ U_CFUNC PHP_FUNCTION(datefmt_format_object)
 		timeStyle = (DateFormat::EStyle)(timeStyle & ~DateFormat::kRelative);
 	}
 
-	zend_class_entry *instance_ce = Z_OBJCE_P(object);
+	zend_class_entry *instance_ce = object->ce;
 	if (instanceof_function(instance_ce, Calendar_ce_ptr)) {
-		Calendar *obj_cal = calendar_fetch_native_calendar(Z_OBJ_P(object));
+		Calendar *obj_cal = calendar_fetch_native_calendar(object);
 		if (obj_cal == NULL) {
 			intl_error_set(NULL, U_ILLEGAL_ARGUMENT_ERROR,
 					"datefmt_format_object: bad IntlCalendar instance: "
diff --git a/ext/intl/tests/dateformat_formatObject_error.phpt b/ext/intl/tests/dateformat_formatObject_error.phpt
index 839cb27d317c9..f2444a5955167 100644
--- a/ext/intl/tests/dateformat_formatObject_error.phpt
+++ b/ext/intl/tests/dateformat_formatObject_error.phpt
@@ -34,8 +34,6 @@ bool(false)
 
 Warning: IntlDateFormatter::formatObject(): datefmt_format_object: bad IntlCalendar instance: not initialized properly in %s on line %d
 bool(false)
-
-Warning: IntlDateFormatter::formatObject(): datefmt_format_object: error calling ::getTimeStamp() on the object in %s on line %d
 Object of type B (inheriting DateTime) has not been correctly initialized by calling parent::__construct() in its constructor
 
 Warning: IntlDateFormatter::formatObject(): datefmt_format_object: the date/time format type is invalid in %s on line %d