time_utility_tpl.hpp

#ifndef TIME_UTILITY_TPL_HPP
#define TIME_UTILITY_TPL_HPP
#include <string>
#include <sstream>
#include <chrono>
#include <ctime>

template <typename Clock, int BufSize>
std::string format_time(std::chrono::time_point<Clock> timepoint, std::string format, tm * (*func)(const time_t*))
{
	char buffer[BufSize];
	time_t timepoint_t = Clock::to_time_t(timepoint);
	tm * tm_struct = (*func)(&timepoint_t);
	strftime(buffer, BufSize, format.data(), tm_struct);
	return std::string(buffer);
}

template <typename Clock, int BufSize>
std::string format_localtime(std::chrono::time_point<Clock> timepoint, std::string format)
{
	return format_time<Clock, BufSize>(timepoint, format, &localtime);
}

template <typename Clock, int BufSize>
std::string format_utc_time(std::chrono::time_point<Clock> timepoint, std::string format)
{
	return format_time<Clock, BufSize>(timepoint, format, &gmtime);
}

#endif