DateTimeUtils.hpp

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#pragma once
#include <ctime>
#include <iomanip>
#include <sstream>
#include <string>
 
namespace tgbotxx {
  namespace DateTimeUtils {
    [[nodiscard]] static std::string toString(const std::time_t& time, const std::string_view& format = "%Y-%m-%d %H:%M:%S") {
      std::tm tm_{};
 
#ifdef _WIN32
      localtime_s(&tm_, &time);
#else
      localtime_r(&time, &tm_);
#endif
 
      std::string result(128, '\0');
      const std::size_t size = std::strftime(result.data(), result.size(), format.data(), &tm_);
      if (size == 0) return {};
 
      result.resize(size);
      return result;
    }
 
    [[nodiscard]] static std::time_t fromString(const std::string& dateTimeStr, const std::string_view& format = "%Y-%m-%d %H:%M:%S") {
      std::tm tm{};
      std::istringstream iss{dateTimeStr};
 
      if (!(iss >> std::get_time(&tm, format.data()))) {
        return -1; // failed to parse dateTimeStr
      }
 
      tm.tm_isdst = -1;
      return std::mktime(&tm);
    }
 
    [[nodiscard]] static std::string now(const std::string_view& format = "%Y-%m-%d %H:%M:%S") {
      const std::time_t tm = std::time(nullptr);
      return toString(tm, format);
    }
 
    [[deprecated("Use DateTimeUtils::now() instead")]] [[nodiscard]] static std::string currentDateTime(const std::string_view& format = "%Y-%m-%d %H:%M:%S") {
      return now(format);
    }
 
  }
}