StrToDate handling of %h(12) is not as expected

[lilinghai]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

SELECT STR_TO_DATE('01,5,2013 12:30:17','%d,%m,%Y %h:%i:%s');

2. What did you expect to see? (Required)

mysql 8.0.17
2013-05-01 00:30:17

3. What did you see instead (Required)

2013-05-01 12:30:17

4. Affected version (Required)

v4.0.0

5. Root Cause Analysis