let urls = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)

if let docUrl = urls.first {
    let dateFormatter = DateFormatter()
    dateFormatter.dateFormat = "yyyy-MM-dd-HH-mm-ss"
    let dateText = dateFormatter.string(from: rideStart)

    positionUrl = docUrl.appendingPathComponent(dateText)
}

try? FileManager.default.createDirectory(at: positionUrl, withIntermediateDirectories: true)

let curUrl = positionUrl.appendingPathComponent("(fileNumber)")

for loc in locationCache {
    do {
        let line = loc.textForFile
        print(line)
        try line.write(to: curUrl, atomically: true, encoding: .utf8)
        }
    catch {
        print(error)
    }
}