=== The ISO8601 time format for C++
Copyright 2010 Toshiyuki Terashita.

sample:
  // t is initialized by time(NLLL).
  TimeIso8601 t(NULL);

  // Convert to string. ex: "2010-09-29T12:24:56+0900" // Set to the time.
  std::string str = t;

  // Set to time of "2000-01-04T12:00:00+0900".
  t = "2000-01-04T12:00:00-0900"

  // Convert to time_t
  time_t tm = t;