How to change CreationDate Resource Value - ios

Question

I'm writing a recording app that enables the user to trim parts of previous recordings and concatenate them into one new recording.
My problem is: let's say I recorded an hour long track and I want to trim the first 2 minutes of that track. when I'll export these 2 minutes the creation date of this track will be "now", and I need it to match the date these 2 minutes actually took place.
So basically I'm trying to modify the tracks Url Resource Values, but I want to change only the creation date.
Is there a way to do this? or is there a way to add a new resource value key? or a way to attach the needed date to the url?
func trimStatringPoint(_ from: Date, startOffSet: TimeInterval, duration: TimeInterval, fileName: String, file: URL, completion: fileExportaionBlock?) {
if let asset = AVURLAsset(url: file) as AVAsset? {
var trimmedFileUrl = documentsDirectory().appendingPathComponent(fileName)
let exporter = AVAssetExportSession(asset: asset, presetName: AVAssetExportPresetAppleM4A)
exporter?.outputFileType = AVFileTypeAppleM4A
exporter?.outputURL = trimmedFileUrl
let start = CMTimeMake(Int64(startOffSet), 1)
let end = CMTimeMake(Int64(startOffSet + duration), 1)
exporter?.timeRange = CMTimeRangeFromTimeToTime(start, end)
exporter?.exportAsynchronously { handler in
if exporter?.status != AVAssetExportSessionStatus.completed {
print("Error while exporting \(exporter?.error?.localizedDescription ?? "unknown")")
completion?(nil)
return
}
}
//------------------------------------------------------
// this code needs to be replaced
do {
var resourceValus = URLResourceValues()
resourceValus.creationDate = from
try trimmedFileUrl.setResourceValues(resourceValus)
} catch {
deleteFile(atPath: trimmedFileUrl)
print("Error while setting date - \(error.localizedDescription)")
completion?(nil)
return
}
//------------------------------------------------------
completion?(trimmedFileUrl)
}

Answer 1

Have you tried mofifying metadata of the exported recording?
https://developer.apple.com/documentation/avfoundation/avmetadatacommonkeycreationdate
AVMutableMetadataItem *item = [AVMutableMetadataItem metadataItem];
metaItem.key = AVMetadataCommonKeyCreationDate;
metaItem.keySpace = AVMetadataKeySpaceCommon;
metaItem.value = [NSDate date];
NSArray *metadata = #{ metaItem };
AVAssetExportSession *exportSession = [AVAssetExportSession exportSessionWithAsset:composition presetName:AVAssetExportPresetMediumQuality];
exportSession.metadata = metadata;