Class Date

inst/include/Rcpp/date_datetime/Date.h:31–136

namespace Rcpp {

    class Date {
    public:
        Date() {
            m_d = 0;
            update_tm();
        }
        Date(SEXP s);

        // from integer (with negative dates before Jan 1, 1970)
        Date(const int &dt) {
            m_d = dt;
            update_tm();
        }

        // from fractional integer since epoch, just like R
        Date(const double &dt) {
            m_d = dt;
            update_tm();
        }
        Date(const std::string &s, const std::string &fmt="%Y-%m-%d");

        Date(const unsigned int &mon, const unsigned int &day, const unsigned int &year) {
            m_tm.tm_sec = m_tm.tm_min = m_tm.tm_hour = m_tm.tm_isdst = 0;

            // allow for ISO-notation case (yyyy, mm, dd) which we prefer over (mm, dd, year)
            if (mon >= baseYear() && day <= 12 && year <= 31) {
                m_tm.tm_year = mon - baseYear();
                m_tm.tm_mon  = day - 1;     // range 0 to 11
                m_tm.tm_mday = year;
            } else {
                m_tm.tm_mday  = day;
                m_tm.tm_mon   = mon - 1;    // range 0 to 11
                m_tm.tm_year  = year - baseYear();
            }
            double tmp = mktime00(m_tm);    // use mktime() replacement borrowed from R
            m_tm.tm_year += baseYear();    // we'd rather keep it as a normal year
            m_d = tmp/(24*60*60);
        }

        double getDate(void) const {
            return m_d;
        }

        // intra-day useless for date class
        //int getSeconds() const { return m_tm.tm_sec; }
        //int getMinutes() const { return m_tm.tm_min; }
        //int getHours()   const { return m_tm.tm_hour; }
        int getDay()     const { return m_tm.tm_mday; }
        int getMonth()   const { return m_tm.tm_mon + 1; }      // makes it 1 .. 12
        int getYear()    const { return m_tm.tm_year; }         // does include 1900 (see Date.cpp)
        int getWeekday() const { return m_tm.tm_wday + 1; }     // makes it 1 .. 7
        int getYearday() const { return m_tm.tm_yday + 1; }     // makes it 1 .. 366

        // 1900 as per POSIX mktime() et al
        static inline unsigned int baseYear() {
            return 1900;
        }