text: /*************************************************************************/
  /* spdlog - an extremely fast and easy to use c++11 logging library.     */
  /* Copyright (c) 2014 Gabi Melman.                                       */
  /*                                                                       */
  /* Permission is hereby granted, free of charge, to any person obtaining */
  /* a copy of this software and associated documentation files (the       */
  /* "Software"), to deal in the Software without restriction, including   */
  /* without limitation the rights to use, copy, modify, merge, publish,   */
  /* distribute, sublicense, and/or sell copies of the Software, and to    */
  /* permit persons to whom the Software is furnished to do so, subject to */
  /* the following conditions:                                             */
  /*                                                                       */
  /* The above copyright notice and this permission notice shall be        */
  /* included in all copies or substantial portions of the Software.       */
  /*                                                                       */
  /* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
  /* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
  /* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
  /* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
  /* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
  /* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
  /* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
  /*************************************************************************/
  
  #pragma once
  
  #include<string>
  #include<cstdio>
  #include<ctime>
  #ifdef _WIN32
  #include <Windows.h>
  #endif
  
  namespace spdlog
  {
  namespace details
  {
  namespace os
  {
  
  inline std::tm localtime(const std::time_t &time_tt)
  {
  
  #ifdef _WIN32
      std::tm tm;
      localtime_s(&tm, &time_tt);
  #else
      std::tm tm;
      localtime_r(&time_tt, &tm);
  #endif
      return tm;
  }
  
  inline std::tm localtime()
  {
      std::time_t now_t = time(0);
      return localtime(now_t);
  }
  
  
  inline std::tm gmtime(const std::time_t &time_tt)
  {
  
  #ifdef _WIN32
      std::tm tm;
      gmtime_s(&tm, &time_tt);
  #else
      std::tm tm;
      gmtime_r(&time_tt, &tm);
  #endif
      return tm;
  }
  
  inline std::tm gmtime()
  {
      std::time_t now_t = time(0);
      return gmtime(now_t);
  }
  inline bool operator==(const std::tm& tm1, const std::tm& tm2)
  {
      return (tm1.tm_sec == tm2.tm_sec &&
              tm1.tm_min == tm2.tm_min &&
              tm1.tm_hour == tm2.tm_hour &&
              tm1.tm_mday == tm2.tm_mday &&
              tm1.tm_mon == tm2.tm_mon &&
              tm1.tm_year == tm2.tm_year &&
              tm1.tm_isdst == tm2.tm_isdst);
  }
  
  inline bool operator!=(const std::tm& tm1, const std::tm& tm2)
  {
      return !(tm1 == tm2);
  }
  
  #ifdef _WIN32
  inline const char* eol()
  {
      return "\r\n";
  }
  #else
  constexpr inline const char* eol()
  {
      return "\n";
  }
  #endif
  
  #ifdef _WIN32
  inline unsigned short eol_size()
  {
      return 2;
  }
  #else
  constexpr inline unsigned short eol_size()
  {
      return 1;
  }
  #endif
  
  //fopen_s on non windows for writing
  inline int fopen_s(FILE** fp, const std::string& filename, const char* mode)
  {
  #ifdef _WIN32
      *fp = _fsopen((filename.c_str()), mode, _SH_DENYWR);
      return *fp == nullptr;
  #else
      *fp = fopen((filename.c_str()), mode);
      return *fp == nullptr;
  #endif
  
  
  }
  
  //Return utc offset in minutes or -1 on failure
  inline int utc_minutes_offset(const std::tm& tm = details::os::localtime())
  {
  
  #ifdef _WIN32
      (void)tm; // avoid unused param warning
      DYNAMIC_TIME_ZONE_INFORMATION tzinfo;
      auto rv = GetDynamicTimeZoneInformation(&tzinfo);
      if (!rv)
          return -1;
      return -1 * (tzinfo.Bias + tzinfo.DaylightBias);
  #else
      return static_cast<int>(tm.tm_gmtoff / 60);
  #endif
  }
  
  
  } //os
  } //details
  } //spdlog
  
  
  
  