ExifDate.swift

extension DateFormatter {
    static var exifDateFormatter: DateFormatter = {
        let formatter = DateFormatter()
        formatter.dateFormat = "yyyy':'MM':'dd' 'HH':'mm':'ss'.'SSS"
        formatter.locale = Locale(identifier: "en_US_POSIX")
        formatter.timeZone = TimeZone.current
        return formatter
    }()
}

func getDateFromImageData(_ data: Data) -> Date? {
    let exif = getEXIFFromImageData(data)
    
    if let exifDictionary = exif["{Exif}"] as? [String: Any],
        let dateTimeOriginal = exifDictionary["DateTimeOriginal"] as? String,
        let subsecondTimeOriginal = exifDictionary["SubsecTimeOriginal"] as? String,
        let date = DateFormatter.exifDateFormatter.date(from: "\(dateTimeOriginal).\(subsecondTimeOriginal)") {
        return date
    } else {
        return nil
    }
}

func getEXIFFromImageData(_ data: Data) -> NSDictionary {
    let imageSourceRef = CGImageSourceCreateWithData(data as CFData, nil);
    let currentProperties = CGImageSourceCopyPropertiesAtIndex(imageSourceRef!, 0, nil)
    let mutableDict = NSDictionary(dictionary: currentProperties!)
    return mutableDict
}