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# DateInterval

The span of time between a specific start date and end date.

```
struct DateInterval
```

## Overview

DateInterval represents a closed date interval in the form of [startDate, endDate].  It is possible for the start and end dates to be the same with a duration of 0.  DateInterval does not support reverse intervals i.e. intervals where the duration is less than 0 and the end date occurs earlier in time than the start date.

## Topics

### Creating a Date Interval

[`init()`](/documentation/Foundation/DateInterval/init())

Initializes an interval with start and end dates set to the current date and the duration set to `0`.

[`init(start:duration:)`](/documentation/Foundation/DateInterval/init(start:duration:))

Initializes an interval with the specified start date and duration.

[`init(start:end:)`](/documentation/Foundation/DateInterval/init(start:end:))

Initializes an interval with the specified start and end date.

### Accessing Start Date, End Date, and Duration

[`start`](/documentation/Foundation/DateInterval/start)

The start date.

[`end`](/documentation/Foundation/DateInterval/end)

The end date.

[`duration`](/documentation/Foundation/DateInterval/duration)

The duration.

### Determining Intersections

[`intersection(with:)`](/documentation/Foundation/DateInterval/intersection(with:))

Returns an interval that represents the interval where the given date interval and the current instance intersect.

[`intersects(_:)`](/documentation/Foundation/DateInterval/intersects(_:))

Indicates whether this interval intersects the specified interval.

### Determining Whether a Date Occurs Within a Date Interval

[`contains(_:)`](/documentation/Foundation/DateInterval/contains(_:))

Indicates whether this interval contains the given date.

### Using Reference Types

[`NSDateInterval`](/documentation/Foundation/NSDateInterval)

An object representing the span of time between a specific start date and end date.


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