VuoTimeUtilities.cc

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#include "VuoTimeUtilities.hh"
 
#include <chrono>
#include <ctime>
#include <sys/time.h>
 
double VuoTimeUtilities::getCurrentTimeInSeconds(void)
{
    struct timeval t = getCurrentTime();
    return t.tv_sec + t.tv_usec / 1000000.;
}
 
struct timeval VuoTimeUtilities::getCurrentTime(void)
{
    struct timeval now;
    gettimeofday(&now, NULL);
    return now;
}
 
struct timeval VuoTimeUtilities::getElapsedTime(const struct timeval &start, const struct timeval &end)
{
    long int diff = (end.tv_usec + 1000000 * end.tv_sec) - (start.tv_usec + 1000000 * start.tv_sec);
    struct timeval result;
    result.tv_sec = diff / 1000000;
    result.tv_usec = diff % 1000000;
    return result;
}
 
string VuoTimeUtilities::getCurrentDateTimeForFileName(void)
{
    // https://stackoverflow.com/questions/15845505/how-to-get-higher-precision-fractions-of-a-second-in-a-printout-of-current-tim
 
    auto now = std::chrono::system_clock::now();
    auto secondsSinceEpoch(std::chrono::duration_cast<std::chrono::seconds>(now.time_since_epoch()));
    std::time_t now_t(std::chrono::system_clock::to_time_t(std::chrono::system_clock::time_point(secondsSinceEpoch)));
 
    const int length = 16;
    char nowToSeconds[length] = {0};
 
    strftime(nowToSeconds, length, "%Y%m%d_%H%M%S", std::localtime(&now_t));
    auto nowMilliseconds = std::chrono::duration_cast<std::chrono::milliseconds>(now.time_since_epoch() - secondsSinceEpoch).count();
 
    char nowFull[length+3] = {0};
    snprintf(nowFull, length+4, "%s%03lld", nowToSeconds, nowMilliseconds);
 
    return nowFull;
}