Find command issue

Dear All,

Below command not showing older files.

find . -type d -mtime 30 -exec ls -ltrd {} \;

drwxr--r-- 1 oratest dba 0 Dec 21 15:57 ./21Dec12_160001

drwxr--r-- 1 oratest dba 0 Dec 21 17:57 ./21Dec12_180001

drwxr--r-- 1 oratest dba 0 Dec 21 19:57 ./21Dec12_200001

drwxr--r-- 1 oratest dba 0 Dec 21 21:57 ./21Dec12_220001

drwxr--r-- 1 oratest dba 0 Dec 21 23:57 ./22Dec12_000001

drwxr--r-- 1 oratest dba 0 Dec 22 01:57 ./22Dec12_020001

drwxr--r-- 1 oratest dba 0 Dec 22 03:57 ./22Dec12_040001

drwxr--r-- 1 oratest dba 0 Dec 22 05:57 ./22Dec12_060001

drwxr--r-- 1 oratest dba 0 Dec 22 07:57 ./22Dec12_080001

drwxr--r-- 1 oratest dba 0 Dec 22 09:57 ./22Dec12_100001

drwxr--r-- 1 oratest dba 0 Dec 22 11:57 ./22Dec12_120001

drwxr--r-- 1 oratest dba 0 Dec 22 13:57 ./22Dec12_140001

Issue is: there are many old files available on the same location but above command is not searching all.

ls -ltar|head -n 10

total 384

drwxr--r-- 1 oratest dba      0 Oct 28 12:24 ..