#pragma once

#include <ctime>
#include <string>
#include <vector>


long now();

long get_gmt_localtime_offset();

std::string date_to_string(const long datetime, const std::string &format);

long string_to_date(const std::string &datestr, const std::string &format);

long add_to_date(const long datetime, const int quantity, const std::string &part);