How can I create a chart showing readings at irregular intervals?

With Application Express 3.2.1 (with Oracle DB 10g) I have been trying, without success, to create a line or scatter chart as follows:
X axis: DateTime
Y axis: Temperature
The temperature values are taken at irregular intervals so the X axis needs to be scaled accordingly.
The charting tool appears not even to recognize dates as a valid data to include in a chart.
Is it possible? If so, how?
Thanks.

Plaese check: http://forums.oracle.com/forums/ann.jspa?annID=283
Regards, Marc

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