I have a data set (~2000 rows) with the following form:

```
+---------------------+-----+-----+-----+-----+-----+
| Datetime | n1 | n2 | n3 | n4 | tot |
+---------------------+-----+-----+-----+-----+-----+
| 2008-08-02 12:25:00 | 20 | 5 | 2 | 3 | 30 |
+---------------------+-----+-----+-----+-----+-----+
```

I'd like to graph this data using a **Stacked Area** chart in Excel 2003. Where I'm having difficulty is I'd like to present the chart on a scale of each hour. Could someone please provide the steps for producing a Stacked Area chart using time scale?