/*
 * ptime — exercise POSIX <time.h>.  All wired through SDCC's z80.lib
 * time.rel which calls our RtcRead() (bridged to ESTEX SYSTIME).
 */

#include <stdio.h>
#include <time.h>

int main(void)
{
    /* time() returns seconds since 1970-01-01 (Unix epoch). */
    time_t now;
    time(&now);
    printf("time()      = %lu epoch seconds\n", now);

    /* localtime() decomposes into struct tm. */
    struct tm *lt = localtime(&now);
    printf("localtime() = %04d-%02d-%02d %02d:%02d:%02d  (wday=%u)\n",
           lt->tm_year + 1900,
           lt->tm_mon  + 1,
           lt->tm_mday,
           lt->tm_hour,
           lt->tm_min,
           lt->tm_sec,
           (unsigned)lt->tm_wday);

    /* asctime() formats it as a 25-char string. */
    printf("asctime()   = %s", asctime(lt));    /* asctime adds \n */

    /* mktime() round-trip — should recover the same epoch. */
    time_t round = mktime(lt);
    printf("mktime()    = %lu  (round-trip %s original)\n",
           round, (round == now ? "==" : "!="));

    /* Native datetime_t API still works alongside. */
    datetime_t dt;
    getdatetime(&dt);
    printf("native      = %04u-%02u-%02u %02u:%02u:%02u  (dow=%u)\n",
           dt.year, dt.month, dt.day,
           dt.hour, dt.minute, dt.second,
           (unsigned)dt.dow);

    return 0;
}