---
title: attributeModificationDateKey
framework: foundation
role: symbol
role_heading: Type Property
path: foundation/urlresourcekey/attributemodificationdatekey
---

# attributeModificationDateKey

The time at which the resource’s attributes were most recently modified, returned as an NSDate object if the volume supports attribute modification dates, or nil if attribute modification dates are unsupported (read-only).

## Declaration

```swift
static let attributeModificationDateKey: URLResourceKey
```

## See Also

### Other resource keys

- [keysOfUnsetValuesKey](foundation/urlresourcekey/keysofunsetvalueskey.md)
- [quarantinePropertiesKey](foundation/urlresourcekey/quarantinepropertieskey.md)
- [addedToDirectoryDateKey](foundation/urlresourcekey/addedtodirectorydatekey.md)
- [contentAccessDateKey](foundation/urlresourcekey/contentaccessdatekey.md)
- [contentModificationDateKey](foundation/urlresourcekey/contentmodificationdatekey.md)
- [creationDateKey](foundation/urlresourcekey/creationdatekey.md)
- [customIconKey](foundation/urlresourcekey/customiconkey.md)
- [documentIdentifierKey](foundation/urlresourcekey/documentidentifierkey.md)
- [effectiveIconKey](foundation/urlresourcekey/effectiveiconkey.md)
- [generationIdentifierKey](foundation/urlresourcekey/generationidentifierkey.md)
- [hasHiddenExtensionKey](foundation/urlresourcekey/hashiddenextensionkey.md)
- [isExcludedFromBackupKey](foundation/urlresourcekey/isexcludedfrombackupkey.md)
- [isExecutableKey](foundation/urlresourcekey/isexecutablekey.md)
- [isHiddenKey](foundation/urlresourcekey/ishiddenkey.md)
- [isReadableKey](foundation/urlresourcekey/isreadablekey.md)