datetime.h

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#pragma once
 
#include <cstdint>
#include <string>
#include <iostream>
#include <regex>
#include <vector>
#include <utility>
 
namespace cutl
{
 enum class datetime_format
 {
 datetime_format_a,
 datetime_format_b,
 datetime_format_c,
 datetime_format_d,
 };
 
 class datetime
 {
 public:
 static constexpr int second = 1000;
 static constexpr int min = 60 * second;
 static constexpr int hour = 60 * min;
 static constexpr int day = 24 * hour;
 
 public:
 datetime(uint64_t ms);
 
 datetime(const datetime &other);
 
 ~datetime();
 
 private:
 datetime();
 
 public:
 static datetime now();
 
 static datetime get(const std::string &time_text, int isdst = -1);
 
 public:
 uint64_t timestamp() const;
 std::string format(datetime_format dfmt = datetime_format::datetime_format_a, bool local = true, bool show_milliseconds = true) const;
 // fmt, usages like std::put_time
 
 std::string format(const std::string &fmt, bool local = true, bool show_milliseconds = true) const;
 
 std::string utctime() const
 {
 return format(datetime_format::datetime_format_a, false);
 }
 
 datetime &operator=(const datetime &other);
 
 datetime operator+(uint64_t ms);
 
 datetime operator-(uint64_t ms);
 
 datetime &operator+=(uint64_t ms);
 
 datetime &operator-=(uint64_t ms);
 
 int64_t operator-(const datetime &other) const;
 
 private:
 using time_regex_type = std::pair<std::string, std::regex>;
 using time_regex_vec_type = std::vector<time_regex_type>;
 static std::string supported_time_formats(const time_regex_vec_type &fmtlist);
 static bool verify_time(const struct tm &time);
 
 private:
 uint64_t timestamp_ms_;
 };
 
 std::ostream &operator<<(std::ostream &os, const datetime &dt);
 
} // namespace