I had the same issue; what i did was i updated my time zone, but still had a lot of trouble recreating the repository; kept having errors.
I followed the below procedure to solve the problem:

1. SQL> alter user SYSMAN account lock;
2. SQL> drop user SYSMAN cascade;
3. SQL> alter user MGMT_VIEW account lock;
4. SQL> drop user MGMT_VIEW cascade;
5. $ emca -deconfig dbcontrol db -repos drop -cluster
6. $ emca -config dbcontrol db -repos create -cluster

Take care...