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;
}
