timezone_secs_since_dow.c

#include "test.h"
#include "timezone.h"
#include <stdlib.h>

int main(void)
{
    const char timezonename[] = "America/Los_Angeles";
    time_t latime;
    int result;
    struct tm tm;
    unsigned char hour, minute, second;
    int dow, i;

    // Get the time in LA
    latime = timezone_current_local_time(timezonename);

    // Convert to a tm struct
    secs_to_tm(latime, &tm);

    // Record the hour and minute
    hour = (unsigned char)tm.tm_hour;
    minute = (unsigned char)tm.tm_min;
    second = (unsigned char)tm.tm_sec;

    for (i = 1; i < 7; i++) {
        // Get the test day of week
        dow = tm.tm_wday - i;
        if (dow < 0)
            dow += 7;

        // Get the result
        result = (int)timezone_secs_since_dow(timezonename, hour, minute,
                                              second, (unsigned char)dow);

        // Result should be within 5 seconds
        TEST_TRUE(abs(result - 86400 * i) < 5);
    }

    return 0;
}