@@ -441,11 +441,11 @@
 - (uint16_t)localDayOfYear
 {
 	LOCALTIME_RET(tm_yday + 1)
 }
 
-- (OFString*)dateStringWithFormat: (OFString*)format
+- (OFString*)dateStringWithFormat: (OFConstantString*)format
 {
 	OFString *ret;
 	time_t seconds_ = (time_t)seconds;
 	struct tm tm;
 	char *buffer;
@@ -487,11 +487,11 @@
 	}
 
 	return ret;
 }
 
-- (OFString*)localDateStringWithFormat: (OFString*)format
+- (OFString*)localDateStringWithFormat: (OFConstantString*)format
 {
 	OFString *ret;
 	time_t seconds_ = (time_t)seconds;
 	struct tm tm;
 	char *buffer;