You can use ISO format (YYYY-MM-DD) for the date literals. For example:
insert into sales_order (
orderno , clientno , orderdate , delyaddr ,
salesmanno , delytype , billyn , delydate , orderstatus)
values (
'O19001',
'C00001',
date '2014-06-12',
'Nadiad',
'S00001',
'F',
'N',
date '2014-07-20',
'In Process'
);
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