[Bug] 内核mktime函数bug #11685

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1. Memory-afk

   added

   bugThis PR/issue is a bug in the current code.This PR/issue is a bug in the current code.

   on Aug 5, 2026
2. github-actions commented on Aug 5, 2026

   

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3. github-actions

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   Arch: ARM/AArch64BSP related with armBSP related with arm

   BSP

   BSP: NuvotonBSP related with NuvotonBSP related with Nuvoton

   KernelPR has src relate codePR has src relate code

   on Aug 5, 2026
4. Memory-afk

   changed the title [-][Bug][/-] [+][Bug] 内核mktime函数bug[/+] on Aug 5, 2026
5. Memory-afk commented on Aug 5, 2026

   

   Memory-afk

   on Aug 5, 2026

   Author

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   这是我的临时解决方案
   time_t timegm(struct tm * const t)
   {
   time_t day;
   time_t i;
   time_t years;

   if(t == RT_NULL)
   {
       rt_set_errno(EFAULT);
       return (time_t)-1;
   }
   
   years = (time_t)t->tm_year - 70;
   if (t->tm_sec > 60)         /* seconds after the minute - [0, 60] including leap second */
   {
       t->tm_min += t->tm_sec / 60;
       t->tm_sec %= 60;
   }
   if (t->tm_min >= 60)        /* minutes after the hour - [0, 59] */
   {
       t->tm_hour += t->tm_min / 60;
       t->tm_min %= 60;
   }
   if (t->tm_hour >= 24)       /* hours since midnight - [0, 23] */
   {
       t->tm_mday += t->tm_hour / 24;
       t->tm_hour %= 24;
   }
   if (t->tm_mon >= 12)        /* months since January - [0, 11] */
   {
       t->tm_year += t->tm_mon / 12;
       t->tm_mon %= 12;
   }
   
   while (t->tm_mday > (__spm[t->tm_mon + 1] - __spm[t->tm_mon]))
   {
       int days_in_month = __spm[t->tm_mon + 1] - __spm[t->tm_mon];
       if (t->tm_mon == 1 && __isleap(t->tm_year + 1900))
           days_in_month = 29;
       t->tm_mday -= days_in_month;
       if (++t->tm_mon >= 12) {
           t->tm_mon = 0;
           ++t->tm_year;
       }
   }
   
   while (t->tm_mday <= 0) {
       if (--t->tm_mon < 0) {
           t->tm_mon = 11;
           --t->tm_year;
       }
       int days_in_month = __spm[t->tm_mon + 1] - __spm[t->tm_mon];
       if (t->tm_mon == 1 && __isleap(t->tm_year + 1900))
           days_in_month = 29;
       t->tm_mday += days_in_month;
   }
   
   years = (time_t)t->tm_year - 70;
   
   if (t->tm_year < 70)
   {
       rt_set_errno(EINVAL);
       return (time_t) -1;
   }
   
   /* Days since 1970 is 365 * number of years + number of leap years since 1970 */
   day = years * 365 + (years + 1) / 4;
   
   /* After 2100 we have to substract 3 leap years for every 400 years
    This is not intuitive. Most mktime implementations do not support
    dates after 2059, anyway, so we might leave this out for it's
    bloat. */
   if (years >= 131)
   {
       years -= 131;
       years /= 100;
       day -= (years >> 2) * 3 + 1;
       if ((years &= 3) == 3)
           years--;
       day -= years;
   }
   
   day += t->tm_yday = __spm[t->tm_mon] + t->tm_mday - 1 +
                       (__isleap(t->tm_year + 1900) & (t->tm_mon > 1));
   
   /* day is now the number of days since 'Jan 1 1970' */
   i = 7;
   t->tm_wday = (int)((day + 4) % i); /* Sunday=0, Monday=1, ..., Saturday=6 */
   
   i = 24;
   day *= i;
   i = 60;
   return ((day + t->tm_hour) * i + t->tm_min) * i + t->tm_sec;
   

   }
   RTM_EXPORT(timegm);
6. github-actions commented on Aug 5, 2026

   

   github-actionsBot

   on Aug 5, 2026 – with GitHub Actions

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   @Memory-afk has claimed this issue. GitHub cannot assign this account, so the claim is tracked by this comment and the in progress label.
7. github-actions

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   in progressPR/issue in progress.PR/issue in progress.

   on Aug 5, 2026
8. Memory-afk

   closed this as not plannedon Aug 5, 2026