# system.kanoa.event.buildDowntimeBarChartByDay(data)

Takes the Downtime Data data returned by the system.kanoa.event.getAssetStateEvents() functions and splits it by day.

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### Parameters
**data** `pyDataset`<br />

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### Returns
**downtimeData** `pyDataset`<br />

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### Example
```python
startDate = system.date.parse("2025-11-01 00:00:00")
endDate = system.date.parse("2025-11-05 00:00:00")
data = system.kanoa.event.getAssetStateEvents({'assetId': 510, 'startDate': startDate, 'endDate': endDate, 'showDowntimeOnly': True})
downtimeData = system.kanoa.event.buildDowntimeBarChartByDay(data)
```