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# init(identifier:)

Creates a new calendar specified by a given identifier.

```
init?(identifier calendarIdentifierConstant: NSCalendar.Identifier)
```

## Parameters

`calendarIdentifierConstant`

The identifier for the new calendar. For valid identifiers, see `Calendar Identifiers`.

## Return Value

The initialized calendar, or `nil` if the identifier is unknown (if, for example, it is either an unrecognized string or the calendar is not supported by the current version of the operating system).

## Discussion

The returned calendar defaults to the current locale and default time zone.

## See Also

[`calendarIdentifier`](/documentation/Foundation/NSCalendar/calendarIdentifier)

An identifier for the calendar.

[`autoupdatingCurrentCalendar`](/documentation/Foundation/NSCalendar/autoupdatingCurrent)

A calendar that tracks changes to user’s preferred calendar.


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