If you just want to do it by code, then try this code:--
l_s_range-low = loc_var_range-low
from_date = l_s_range-low.
to_date = l_s_range-high.
l_s_range-sign = 'I'.
l_s_range-opt = 'BT'.
l_s_range-low = from_date.
Append l_s_range TO e_t_data.
Here is my blog : How to derive Calmonth & Calyear from Calday easily