buildroot/package/busybox/busybox-0003-busybox-1.22.1-date.patch

--- busybox-1.22.1/libbb/time.c
+++ busybox-1.22.1-date/libbb/time.c
@@ -68,15 +68,23 @@ void FAST_FUNC parse_datestr(const char
 			/* else end != NUL and we error out */
 		}
 	} else
-	/* yyyy-mm-dd HH */
-	if (sscanf(date_str, "%u-%u-%u %u%c", &ptm->tm_year,
+	if (strchr(date_str, '-')
+	    /* Why strchr('-') check?
+	     * sscanf below will trash ptm->tm_year, this breaks
+	     * if parse_str is "10101010" (iow, "MMddhhmm" form)
+	     * because we destroy year. Do these sscanf
+	     * only if we saw a dash in parse_str.
+	     */
+		/* yyyy-mm-dd HH */
+	 && (sscanf(date_str, "%u-%u-%u %u%c", &ptm->tm_year,
 				&ptm->tm_mon, &ptm->tm_mday,
 				&ptm->tm_hour,
 				&end) >= 4
-	/* yyyy-mm-dd */
-	 || sscanf(date_str, "%u-%u-%u%c", &ptm->tm_year,
+		/* yyyy-mm-dd */
+	     || sscanf(date_str, "%u-%u-%u%c", &ptm->tm_year,
 				&ptm->tm_mon, &ptm->tm_mday,
 				&end) >= 3
+	    )
 	) {
 		ptm->tm_year -= 1900; /* Adjust years */
 		ptm->tm_mon -= 1; /* Adjust month from 1-12 to 0-11 */