addRowFromValues is not happy with Date, nor string, nor long.
DataTable data = new DataTable();
ArrayList<ColumnDescription> cd = new
ArrayList<ColumnDescription>();
cd.add(new ColumnDescription("time", ValueType.DATETIME, "time"));
cd.add(new ColumnDescription("value", ValueType.NUMBER, "value"));
data.addColumns(cd);
data.addRowFromValues(new Date(milliseconds),
rand.nextInt(1000000));
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