Use transaction SE38 ->Run Report RDDPROTA ->
Use Value TRLOGSYSTEM – This log is also visible directly from SE06 transaction itself. Has the logs with time for system change options.
Use Value SAP_SE06 – This shows the log for changes in system change options happened during System initialisation. Because of bug in the program, this log do not have the dates. This error is discussed in the sap “Note 1444835 – Missing change date in log SAP_SE06”