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#define SECOND 1#define MINUTE 60#define HOUR   60 * MINUTE#define DAY    24 * HOURmytime from_timestamp(int timestamp) {  mytime temp;  temp.year = 1970;  temp.month = 1;  temp.day = 1;  temp.hour = 0;  temp.minute = 0;  temp.second = 0;  // YEARS  while (timestamp > seconds_in_year(temp.year)) {    timestamp -= seconds_in_year(temp.year);    temp.year++;  }  // DAYS  while (timestamp > DAY) {    timestamp -= DAY;    temp.day++;    if (temp.day > days_in_month(temp.year, temp.month)) {      temp.month++;      temp.day=1;    }  }  // HOURS  while (timestamp > HOUR) {    timestamp -= HOUR;    temp.hour++;  }  // MINUTES  while (timestamp > MINUTE) {    timestamp -= MINUTE;    temp.minute++;  }  // SECONDS  temp.second = timestamp;  return temp;}