libepoch/datetime.c

#include "epoch.h"
#include <stdint.h>
#include <time.h>

int32_t dateTimeGetYear(DateTime *self) {
    return self->year.year;
}

int64_t dateTimeGetTimestampNaive(DateTime *self) {
    int64_t seconds = 0;
    Year    year    = (Year){ .tag = normalYear, .year = 1970 };
    Month   month   = January;
    int32_t oldyear = yearGetInner(&self->year);

    if (oldyear < 1970) {
        while (yearGetInner(&year) > oldyear) {
            yearDecrement(&year);
            seconds -= yearGetSeconds(&year);
        }
    } else if (oldyear > 1970) {
        while (yearGetInner(&year) < oldyear) {
            seconds += yearGetSeconds(&year);
            yearIncrement(&year);
        }
    }
    while (month < self->month) {
        seconds += monthGetSeconds(month, &self->year);
        monthIncrement(&month);
    }
    seconds += ((int64_t)self->day - 1) * SECONDS_PER_DAY;
    seconds += (int64_t)self->hour * SECONDS_PER_HOUR;
    seconds += (int64_t)self->minute * 60;
    seconds += (int64_t)self->second;
    return seconds;
}

int64_t dateTimeGetTimestamp(DateTime *self) {
    int64_t seconds = dateTimeGetTimestampNaive(self);
    seconds += timezoneAsSeconds(&self->zone);
    return seconds;
}

void dateTimeGetTimeval(DateTime *self, struct timespec * ts) {
    ts->tv_nsec = self->nanoseconds;
    ts->tv_sec  = (time_t)dateTimeGetTimestamp(self);
}