{ DATE
| TIMESTAMP [( fractional_seconds_precision )] [WITH [LOCAL] TIME ZONE] )
| INTERVAL YEAR [( year_precision )] TO MONTH
| INTERVAL DAY [( day_precision )] TO SECOND [( fractional_seconds_precision )]
}

For information on the symbols and conventions of Backus-Naur Form (BNF) syntax, see Appendix A.