Solution : https://service.sap.com/sap/support/notes/950530 (SAP Service marketplace login required)
Key words : 
-begin        end   days    weeks      month     year18-05-2006  31-12-2006  228, -begin       end     days    weeks      month     year18-05-2006  31-12-2006  228, ipc returns wrong year, end date belongs, underlying system setup, daylight saving time, sp 23or ipc 4, sp 11or ap 7, sap service marketplace, 62222the correct year
Related Notes : 
       
| 898978 | Wrong month, year values from pricing. | 
| 486061 | How to get patches for CRM Internet Pricing Configurator |