Solution : https://service.sap.com/sap/support/notes/533999 (SAP Service marketplace login required)
Key words : 
invalid date format solution, <dbmpasswd> param_directget _unicodeif, unicode database terminates, database works, unicode reason, unicode databases, unicode db, symptom restore, time recovery, error message
Related Notes : 
       
| 620218 | Installing SAP DB Version 7.3.00 B33 or higher (BW, CS) | 
| 530567 | Importing SAP DB Version 7.3.00 B33 or higher (OLTP) | 
| 434645 | Point-in-time recovery: What must I be aware of? |