open Unix

let now () =
  let current_time = time () in
  let human_time = localtime current_time in
  let year = 1900 + human_time.tm_year in
  let month = human_time.tm_mon + 1 in
  let day = human_time.tm_mday in
  let hour = human_time.tm_hour in
  let minute = human_time.tm_min in
  let second = human_time.tm_sec in

  Printf.sprintf "%04d-%02d-%02d %02d:%02d:%02d"
    year month day hour minute second

let result_unpack = function | Ok o -> o | Error e -> e