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# NSDatePickerCellDelegate

A set of optional methods implemented by delegates of [`NSDatePickerCell`](/documentation/AppKit/NSDatePickerCell) objects.

```
protocol NSDatePickerCellDelegate : NSObjectProtocol
```

## Topics

### Content Validation

[`-  datePickerCell:validateProposedDateValue:timeInterval:`](/documentation/AppKit/NSDatePickerCellDelegate/datePickerCell(_:validateProposedDateValue:timeInterval:))

The delegate receives this message each time the user attempts to change the receiver’s value, allowing the delegate the opportunity to override the change.

## Relationships

### Inherits From

[`NSObjectProtocol`](/documentation/ObjectiveC/NSObjectProtocol)

---

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