---
title: "weekCalendarPageViewController(_:didChangeDateInterval:)"
framework: CareKit
role: symbol
role_heading: Instance Method
platforms: [iOS 13.0+, Mac Catalyst 13.0+, watchOS 7.0+]
path: "carekit/ockweekcalendarpageviewcontrollerdelegate/weekcalendarpageviewcontroller(_:didchangedateinterval:)"
---

# weekCalendarPageViewController(_:didChangeDateInterval:)

Notifies the delegate when there is a change in the date interval in the calendar.

## Declaration

```swift
func weekCalendarPageViewController(_ viewController: OCKWeekCalendarPageViewController, didChangeDateInterval interval: DateInterval)
```

## Parameters

- `viewController`: The view controller that displays the calendar.
- `interval`: The new date interval to use for the calendar view.

## See Also

### Handling Dates

- [weekCalendarPageViewController(_:didSelectDate:previousDate:)](carekit/ockweekcalendarpageviewcontrollerdelegate/weekcalendarpageviewcontroller(_:didselectdate:previousdate:).md)