Woops, im getting ahead of myself, we dont have the -r (refernece)
option yet
diff --git a/coreutils/date.c b/coreutils/date.c
index 46d2e10..1aa3e22 100644
--- a/coreutils/date.c
+++ b/coreutils/date.c
@@ -118,7 +118,9 @@
 #define DATE_OPT_SET    	0x02
 #define DATE_OPT_UTC    	0x04
 #define DATE_OPT_DATE   	0x08
-#define DATE_OPT_REFERENCE	0x10
+#ifdef CONFIG_FEATURE_DATE_ISOFMT
+# define DATE_OPT_TIMESPEC	0x10
+#endif
 
 int date_main(int argc, char **argv)
 {
@@ -156,7 +158,7 @@
 	if(opt & 0x80000000UL)
 		bb_show_usage();
 #ifdef CONFIG_FEATURE_DATE_ISOFMT
-	if(opt & DATE_OPT_REFERENCE) {
+	if(opt & DATE_OPT_TIMESPEC) {
 		if (!isofmt_arg) {
 			ifmt = 1;
 		} else {