int OPENSSL_gmtime_adj(struct tm *tm, int off_day, long offset_sec) { int time_sec, time_year, time_month, time_day; long time_jd; /* Convert time and offset into Julian day and seconds */ if (!julian_adj(tm, off_day, offset_sec, &time_jd, &time_sec)) return 0; /* Convert Julian day back to date */ julian_to_date(time_jd, &time_year, &time_month, &time_day); if (time_year < 1900 || time_year > 9999) return 0; /* Update tm structure */ tm->tm_year = time_year - 1900; tm->tm_mon = time_month - 1; tm->tm_mday = time_day; tm->tm_hour = time_sec / 3600; tm->tm_min = (time_sec / 60) % 60; tm->tm_sec = time_sec % 60; return 1; }
int OPENSSL_gmtime_adj(struct tm *tm, int off_day, long offset_sec) { int offset_hms, offset_day; long time_jd; int time_year, time_month, time_day; /* split offset into days and day seconds */ offset_day = offset_sec / SECS_PER_DAY; /* Avoid sign issues with % operator */ offset_hms = offset_sec - (offset_day * SECS_PER_DAY); offset_day += off_day; /* Add current time seconds to offset */ offset_hms += tm->tm_hour * 3600 + tm->tm_min * 60 + tm->tm_sec; /* Adjust day seconds if overflow */ if (offset_hms >= SECS_PER_DAY) { offset_day++; offset_hms -= SECS_PER_DAY; } else if (offset_hms < 0) { offset_day--; offset_hms += SECS_PER_DAY; } /* Convert date of time structure into a Julian day number. */ time_year = tm->tm_year + 1900; time_month = tm->tm_mon + 1; time_day = tm->tm_mday; time_jd = date_to_julian(time_year, time_month, time_day); /* Work out Julian day of new date */ time_jd += offset_day; if (time_jd < 0) return 0; /* Convert Julian day back to date */ julian_to_date(time_jd, &time_year, &time_month, &time_day); if (time_year < 1900 || time_year > 9999) return 0; /* Update tm structure */ tm->tm_year = time_year - 1900; tm->tm_mon = time_month - 1; tm->tm_mday = time_day; tm->tm_hour = offset_hms / 3600; tm->tm_min = (offset_hms / 60) % 60; tm->tm_sec = offset_hms % 60; return 1; }