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

# weekCalendarPageViewController(_:didChangeDateInterval:)

Notifies the delegate of a change in the calendar’s date interval.

## Declaration

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

## See Also

### Handling Calendar Changes

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