为啥提示 SQL 命令未正确结束？

        Dim cmd As New OracleCommand
        cmd.CommandText = "select * from Biao1 where JBSJ=2013/6/21 21:39:13
        cmd.Connection = OrclConn
        cmd.CommandType = CommandType.Text
        Dim OrclAdp As New OracleDataAdapter
        OrclAdp.SelectCommand = cmd
        Dim ds As New DataSet
        Try
            OrclAdp.Fill(ds, TableName)
        Catch ex As Exception
            MsgBox(ex.Message)
            Return Nothing
        End Try

其中JBSJ是Biao1中date类型的字段，执行时提示： SQL 命令未正确结束？
是怎么回事，如何解决？ 连接的是oracle数据库
[解决办法]
是不是少引号？另外JBSJ=2013/6/21 21:39:13这种写法可以吗？
[解决办法]
又错了,是

cmd.CommandText = "select * from Biao1 where JBSJ="'"&datetimepicker1.value&"'";

[解决办法]
cmd.CommandText = "select * from Biao1 where JBSJ=2013/6/21 21:39:13

这里错了
[解决办法]
cmd.CommandText = "select * from Biao1 where JBSJ='"&datetimepicker1.value&"'";