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# Charts for WinForms - Use automatic date-time scale modes of an axis

This example uses **date-time scale modes** of an [axis](https://docs.devexpress.com/WindowsForms/5799/controls-and-libraries/chart-control/axes/axis-scale-types) (both manual and automatic).

The data aggregation is enabled automatically for the date-time scale on the X-axis in both manual (default mode) and automatic scale modes.

When the [ScaleOptionsBase.ScaleMode](https://docs.devexpress.com/CoreLibraries/DevExpress.XtraCharts.ScaleOptionsBase.ScaleMode) property is set to `Manual`, you can manually define the [DateTimeScaleOptions.GridAlignment](https://docs.devexpress.com/CoreLibraries/DevExpress.XtraCharts.DateTimeScaleOptions.GridAlignment), [DateTimeScaleOptions.MeasureUnit](https://docs.devexpress.com/CoreLibraries/DevExpress.XtraCharts.DateTimeScaleOptions.MeasureUnit), and [ScaleGridOptionsBase.AggregateFunction](https://docs.devexpress.com/CoreLibraries/DevExpress.XtraCharts.ScaleGridOptionsBase.AggregateFunction) properties.

To use the automatic date-time scale mode, set the [ScaleOptionsBase.ScaleMode](https://docs.devexpress.com/CoreLibraries/DevExpress.XtraCharts.ScaleOptionsBase.ScaleMode) property to `Automatic` and choose the appropriate [ScaleGridOptionsBase.AggregateFunction](https://docs.devexpress.com/CoreLibraries/DevExpress.XtraCharts.ScaleGridOptionsBase.AggregateFunction).

If you wish axis scale is not divided into intervals and therefore aggregation cannot be applied to chart data, set the [ScaleOptionsBase.ScaleMode](https://docs.devexpress.com/CoreLibraries/DevExpress.XtraCharts.ScaleOptionsBase.ScaleMode) property to `Continuous`.

## Files to Review

* [Form1.cs](./CS/DateTimeAggregation/Form1.cs) (VB: [Form1.vb](./VB/DateTimeAggregation/Form1.vb))

## Documentation

- [Axis Scale Types](https://docs.devexpress.com/WindowsForms/5799/controls-and-libraries/chart-control/axes/axis-scale-types)
- [Data Aggregation](https://docs.devexpress.com/WindowsForms/6247/controls-and-libraries/chart-control/data-representation/data-aggregation)

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# WinForms Chart - Date-Time Scale Modes of an Axis

This example allows you to control the appearance of date‑time [axes](https://docs.devexpress.com/WindowsForms/5799/controls-and-libraries/chart-control/axes/axis-scale-types) in a WinForms Chart.

The application displays combo boxes that allow you to change **date-time scale modes** of an [axis](https://docs.devexpress.com/WindowsForms/5799/controls-and-libraries/chart-control/axes/axis-scale-types).

![Chart - Date-Time-intervals](image/chart-date-time-intervals.png)

## Implementation Details
The combo boxes are created with the following logic:

- If the [ScaleOptionsBase.ScaleMode](https://docs.devexpress.com/CoreLibraries/DevExpress.XtraCharts.ScaleOptionsBase.ScaleMode) property is set to `Manual`, you can change the following properties:
- [DateTimeScaleOptions.GridAlignment](https://docs.devexpress.com/CoreLibraries/DevExpress.XtraCharts.DateTimeScaleOptions.GridAlignment)
- [DateTimeScaleOptions.MeasureUnit](https://docs.devexpress.com/CoreLibraries/DevExpress.XtraCharts.DateTimeScaleOptions.MeasureUnit)
- [ScaleGridOptionsBase.AggregateFunction](https://docs.devexpress.com/CoreLibraries/DevExpress.XtraCharts.ScaleGridOptionsBase.AggregateFunction)

- If the [ScaleOptionsBase.ScaleMode](https://docs.devexpress.com/CoreLibraries/DevExpress.XtraCharts.ScaleOptionsBase.ScaleMode) property is set to `Automatic`, a chart uses automatic date-time scale mode and the appropriate [ScaleGridOptionsBase.AggregateFunction](https://docs.devexpress.com/CoreLibraries/DevExpress.XtraCharts.ScaleGridOptionsBase.AggregateFunction).

The date-time scale on the X-axis applies data aggregation automatically in `Manual` and `Automatic` modes. If you wish not to divide axis scale into intervals and do not apply aggregation to chart data, set the [ScaleOptionsBase.ScaleMode](https://docs.devexpress.com/CoreLibraries/DevExpress.XtraCharts.ScaleOptionsBase.ScaleMode) property to `Continuous`.

## Files to Review

* [Form1.cs](./CS/DateTimeAggregation/Form1.cs) (VB: [Form1.vb](./VB/DateTimeAggregation/Form1.vb))
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The example throws an unhandled exception (select the grid alignment other than Auto, then select the "Automatic" scale mode). Update the code as follows (a quick fix):

void SetAutomaticScaleMode() {
    ResetAxisOptions(); // Add this line.
    AxisX.DateTimeScaleOptions.ScaleMode = ScaleMode.Automatic;
    UpdateGridAlignment(1);
}

void SetAxisXGridAuto() {
    AxisX.DateTimeScaleOptions.AutoGrid = true;
    cbGridAlignment.SelectedIndex = 0; // Add this line.
}


## Documentation

- [Axis Scale Types](https://docs.devexpress.com/WindowsForms/5799/controls-and-libraries/chart-control/axes/axis-scale-types)
- [Data Aggregation](https://docs.devexpress.com/WindowsForms/6247/controls-and-libraries/chart-control/data-representation/data-aggregation)

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