text: // Copyright (c) 2009-2010 Satoshi Nakamoto
  // Copyright (c) 2009-2019 The Bitcoin Core developers
  // Distributed under the MIT software license, see the accompanying
  // file COPYING or http://www.opensource.org/licenses/mit-license.php.
  
  #ifndef BITCOIN_UTIL_TIME_H
  #define BITCOIN_UTIL_TIME_H
  
  #include <stdint.h>
  #include <string>
  #include <chrono>
  
  /**
   * Helper to count the seconds of a duration.
   *
   * All durations should be using std::chrono and calling this should generally be avoided in code. Though, it is still
   * preferred to an inline t.count() to protect against a reliance on the exact type of t.
   */
  inline int64_t count_seconds(std::chrono::seconds t) { return t.count(); }
  
  /**
   * DEPRECATED
   * Use either GetSystemTimeInSeconds (not mockable) or GetTime<T> (mockable)
   */
  int64_t GetTime();
  
  /** Returns the system time (not mockable) */
  int64_t GetTimeMillis();
  /** Returns the system time (not mockable) */
  int64_t GetTimeMicros();
  /** Returns the system time (not mockable) */
  int64_t GetSystemTimeInSeconds(); // Like GetTime(), but not mockable
  
  /** For testing. Set e.g. with the setmocktime rpc, or -mocktime argument */
  void SetMockTime(int64_t nMockTimeIn);
  /** For testing */
  int64_t GetMockTime();
  
  bool IsLockTimeWithin14days(int64_t locktime, int64_t reference);
  bool IsLockTimeWithinMinutes(int64_t locktime, int minutes, int64_t reference);
  
  void MilliSleep(int64_t n);
  
  /** Return system time (or mocked time, if set) */
  template <typename T>
  T GetTime();
  
  /**
   * ISO 8601 formatting is preferred. Use the FormatISO8601{DateTime,Date}
   * helper functions if possible.
   */
  std::string FormatISO8601DateTime(int64_t nTime);
  std::string FormatISO8601Date(int64_t nTime);
  int64_t ParseISO8601DateTime(const std::string& str);
  
  #endif // BITCOIN_UTIL_TIME_H
  