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# nonGregorianBirthday

A date component for the non-Gregorian birthday of the contact.

```
var nonGregorianBirthday: DateComponents? { get }
```

## Discussion

Non-Gregorian birthdays can be displayed using this property, which has values that are the relevant properties of an <doc://com.apple.documentation/documentation/Foundation/NSDateComponents> object. Day and month components are required; year and leap month are optional. The calendar component is also required and must be an <doc://com.apple.documentation/documentation/Foundation/NSCalendar> object with an identifier other than <doc://com.apple.documentation/documentation/Foundation/NSCalendar/Identifier/gregorian>. For example, some supported calendars are Chinese, Hebrew, or Islamic. All other date components are invalid and including them results in an <doc://com.apple.documentation/documentation/Foundation/NSError> object that includes the key paths of the invalid components and the error code [`CNError.Code.validationConfigurationError`](/documentation/Contacts/CNError/Code/validationConfigurationError).

---

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