Linux系统时间获取处理

查了一些手册及blog（如：https://www.cnblogs.com/zxc2man/p/7660240.html）获取系统时间，在服务器验证OK，但在嵌入式单板时间会少时区校正。

如

#include "time.h" void main () { time_t rawtime; struct tm * timeinfo; time ( &rawtime ); timeinfo = localtime ( &rawtime ); printf ( "\007The current date/time is: %s\n", asctime (timeinfo) ); printf ( "\007The current time,%2d:%2d:%2d \n", timeinfo->tm_hour, timeinfo->tm_min, timeinfo->tm_sec ); exit(0); }

https://www.cnblogs.com/smith9527/p/10216830.html

这里说是增加tzset()调用可以解决，但尝试无效。最终还是使用gettimeofday自己增加时区换算+gmtime来完成。

    int iRet;     struct tm*   ptr = NULL;     char sDayTime[128] = {0};     struct timeval tv;     struct timezone tz;     time_t timep = 0;     timeinfo = localtime ( &rawtime );         iRet = gettimeofday(&tv, &tz);     if (iRet < 0) {         printf("got time failed");     }     else{         timep = tv.tv_sec + tz.tz_minuteswest * 60 + tz.tz_dsttime * 3600;         ptr = gmtime(&timep);         if (NULL == ptr) {             printf("gmtime failed");         }         else{             sprintf(sDayTime, "%04d-%02d-%02dT%02d:%02d:%02d", ptr->tm_year + 1900, ptr->tm_mon + 1,                 ptr->tm_mday, ptr->tm_hour, ptr->tm_min, ptr->tm_sec);             printf("Current sDayTime:%s", sDayTime);         }     }