DateTime.h

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#ifndef DATETIME_H
#define DATETIME_H
 
#include <ctime>
#include <string>
#include <cstdint>
 
class DateTime;
 
class Date {
private:
    bool valid_ = false;
    int year_ = 0;
    int month_ = 0;
    int day_ = 0;
public:
    Date() = default;
    Date(int y, int m, int d)
        : valid_(true)
        , year_(y)
        , month_(m)
        , day_(d)
    {}
    int year() const { return year_; }
    int month() const { return month_; }
    int day() const { return day_; }
    bool isValid() const { return valid_; }
    std::string toString() const;
};
 
class Time {
private:
    bool valid_ = false;
    int hour_ = 0;
    int minute_ = 0;
    int second_ = 0;
public:
    Time() = default;
    Time(int h, int m, int s)
        : valid_(true)
        , hour_(h)
        , minute_(m)
        , second_(s)
    {}
    int hour() const { return hour_; }
    int minute() const { return minute_; }
    int second() const { return second_; }
    bool isValid() const { return valid_; }
    std::string toString() const;
};
 
class DateTime {
private:
    Date date_;
    Time time_;
public:
    DateTime() = default;
    DateTime(Date const &date, Time const &time)
        : date_(date), time_(time)
    {
    }
    Date const &date() const { return date_; }
    Time const &time() const { return time_; }
    void setDate(Date const &date)
    {
        date_ = date;
    }
    void setTime(Time const &time)
    {
        time_ = time;
    }
 
    bool isValid() const
    {
        return date_.isValid() && time_.isValid();
    }
 
    time_t toSecsSinceEpoch() const
    {
        struct tm t;
        t.tm_year = date_.year() - 1900;
        t.tm_mon = date_.month() - 1;
        t.tm_mday = date_.day();
        t.tm_hour = time_.hour();
        t.tm_min = time_.minute();
        t.tm_sec = time_.second();
        t.tm_isdst = -1;
        return mktime(&t);
    }
 
    std::string toString() const;
 
    static DateTime parseDateTime(char const *s);
    static DateTime fromSecsSinceEpoch(uint64_t t);
};
 
#endif // DATETIME_H