date - Date field containing the date to be modified
format - Formatting in which the date field is
operator - "" for increment and "-" for decrement
D - Number of days to increase or decrease
M - Number of months to increase or decrease
A - Number of years to increase or decrease
E.g.1:
{datanasc} = sc_data ({datanasc}, "dd/mm/aaaa", " ", 30, 0, 0);
E.g.2:
$nova_data = sc_data ({datanasc}, "aaaa-mm-dd", "-", 15, 3, 2);
E.g.3:
{dt_inclusao} = sc_data (date('Ymd'), "aaaammdd", "-", 0, 1, 1);