Present date as default value in a table

Please try the below code. Note that you need to set the value before START-OF_SELECTION

select-OPTIONS: so_date FOR sy-datlo.
INITIALIZATION.
so_date-sign = 'I'.
so_date-option = 'EQ'.
so_date-low = sy-datum.
CLEAR so_date-high.
APPEND so_date.

You can also try this easy option −

select-OPTIONS: so_date FOR sy-datlo default SY-DATUM.