Fix datetime format string to follow POSIX spec in ftp_mdtm()

Closes GH-8259

Author: mdsnins

NEWS

@@ -30,6 +30,9 @@ PHP                                                                        NEWS
   . Added support for listening queue on macOS. (David Carlier)
   . Changed default for listen.backlog on Linux to -1. (Cristian Rodríguez)
 
+- FTP:
+  . Fix datetime format string to follow POSIX spec in ftp_mdtm(). (Jihwan Kim)
+
 - Intl:
   . Update all grandfathered language tags with preferred values
   . Fixed GH-7939 (Cannot unserialize IntlTimeZone objects). (cmb)

ext/ftp/ftp.c

@@ -1145,7 +1145,7 @@ ftp_mdtm(ftpbuf_t *ftp, const char *path, const size_t path_len)
 	}
 	/* parse out the timestamp */
 	for (ptr = ftp->inbuf; *ptr && !isdigit(*ptr); ptr++);
-	n = sscanf(ptr, "%4u%2u%2u%2u%2u%2u", &tm.tm_year, &tm.tm_mon, &tm.tm_mday, &tm.tm_hour, &tm.tm_min, &tm.tm_sec);
+	n = sscanf(ptr, "%4d%2d%2d%2d%2d%2d", &tm.tm_year, &tm.tm_mon, &tm.tm_mday, &tm.tm_hour, &tm.tm_min, &tm.tm_sec);
 	if (n != 6) {
 		return -1;
 	}