A helper function to update the modified date of a file

File.swift

static func update(modifiedDate: Date, url: URL) {
  do {
    var values = try url.resourceValues(forKeys: [URLResourceKey.contentModificationDateKey])
    values.contentModificationDate = modifiedDate
    try url.setResourceValues(values)
  } catch {
    print(error.localizedDescription)
  }
}