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# Time events

Events based on time, significant occurrences, and time durations.

## Topics

### Dates and times

[`class HMCalendarEvent`](/documentation/HomeKit/HMCalendarEvent)

An event that fires at a specified time.

[`class HMMutableCalendarEvent`](/documentation/HomeKit/HMMutableCalendarEvent)

A mutable event that fires at a specified time.

[`class HMTimeEvent`](/documentation/HomeKit/HMTimeEvent)

An abstract superclass for time-based events.

### Significant events

[`struct HMSignificantEvent`](/documentation/HomeKit/HMSignificantEvent)

An event that represents significant time-based events, including sunrise and sunset.

[`class HMSignificantTimeEvent`](/documentation/HomeKit/HMSignificantTimeEvent)

An event that fires at a time offset from a significant time-based event.

[`class HMMutableSignificantTimeEvent`](/documentation/HomeKit/HMMutableSignificantTimeEvent)

A mutable event that fires at the specified temporal offset to a significant event.

### Durations

[`class HMDurationEvent`](/documentation/HomeKit/HMDurationEvent)

An event that ends after the specified time duration.

[`class HMMutableDurationEvent`](/documentation/HomeKit/HMMutableDurationEvent)

A mutable event that fires after the specified time duration.


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