time_example.cpp

Demonstrates the tempoch C++ API.

Demonstrates the tempoch C++ API.Build and run: cmake -B build && cmake –build build ./build/time_example

 
#include <tempoch/tempoch.hpp>
#include <iostream>
#include <iomanip>
 
int main() {
    using namespace tempoch;
 
    // ---------------------------------------------------------------
    // UTC → JulianDate → MJD round-trip
    // ---------------------------------------------------------------
    UTC utc(2026, 7, 15, 22, 0, 0);
    std::cout << "UTC:  " << utc.year << "-"
              << std::setfill('0') << std::setw(2) << (int)utc.month << "-"
              << std::setw(2) << (int)utc.day << " "
              << std::setw(2) << (int)utc.hour << ":"
              << std::setw(2) << (int)utc.minute << ":"
              << std::setw(2) << (int)utc.second << "\n";
 
    auto jd = JulianDate::from_utc(utc);
    std::cout << "JD:   " << std::fixed << std::setprecision(6) << jd.value() << "\n";
 
    auto mjd = MJD::from_jd(jd);
    std::cout << "MJD:  " << std::fixed << std::setprecision(6) << mjd.value() << "\n";
 
    auto utc2 = mjd.to_utc();
    std::cout << "Back: " << utc2.year << "-"
              << std::setfill('0') << std::setw(2) << (int)utc2.month << "-"
              << std::setw(2) << (int)utc2.day << " "
              << std::setw(2) << (int)utc2.hour << ":"
              << std::setw(2) << (int)utc2.minute << ":"
              << std::setw(2) << (int)utc2.second << "\n\n";
 
    // ---------------------------------------------------------------
    // J2000 epoch and Julian centuries
    // ---------------------------------------------------------------
    auto j2000 = JulianDate::J2000();
    std::cout << "J2000.0:  " << j2000.value() << "\n";
    std::cout << "Centuries since J2000: " << jd.julian_centuries() << "\n\n";
 
    // ---------------------------------------------------------------
    // Period intersection
    // ---------------------------------------------------------------
    Period night(60200.0, 60200.5);
    Period obs(60200.2, 60200.8);
    auto overlap = night.intersection(obs);
    std::cout << "Night:   [" << night.start_mjd() << ", " << night.end_mjd() << "]\n";
    std::cout << "Obs:     [" << obs.start_mjd() << ", " << obs.end_mjd() << "]\n";
    std::cout << "Overlap: [" << overlap.start_mjd() << ", " << overlap.end_mjd() << "]\n";
    std::cout << "Overlap duration: " << overlap.duration_days() * 24.0 << " hours\n";
 
    return 0;
}