用c获得当前系统时间

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1、#include#includevoidmain(){time_trawtime;structtm*timeinfo;time(&rawtime);timeinfo=localtime(&rawtime);printf("07Thecurrentdate/timeis:%s",asctime(timeinfo));exit(0);}=================#include--必须的时间函数头文件time_t--时间类型（time.h定义）structtm--时间结构，time.h定义如下：i

2、nttm_sec;inttm_min;inttm_hour;inttm_mday;inttm_mon;inttm_year;inttm_wday;inttm_yday;inttm_isdst;time(&rawtime);--获取时间，以秒计，从1970年1月一日起算，存于rawtimelocaltime(&rawtime);--转为当地时间，tm时间结构asctime（）--转为标准ASCII时间格式：星期月日时：分：秒年=========================================你要的格式可这样输出：printf("%4d-%0

3、2d-%02d%02d:%02d:%02d",1900+timeinfo->tm_year,1+timeinfo->tm_mon,timeinfo->tm_mday,timeinfo->tm_hour,timeinfo->tm_min,timeinfo->tm_sec);就是直接打印tm，tm_year从1900年计算，所以要加1900，月tm_mon，从0计算，所以要加1Example/*TIMES.Cillustratesvarioustimeanddatefunctionsincluding:*time_ftimectimeasctime*lo

4、caltimegmtimemktime_tzset*_strtime_strdatestrftime**Alsotheglobalvariable:*_tzname*/#include#include#include#include#includevoidmain(){chartmpbuf[128],ampm[]="AM";time_tltime;struct_timebtstruct;structtm*today,*gmt,xmas={0,0,12

5、,25,11,93};/*SettimezonefromTZenvironmentvariable.IfTZisnotset,*theoperatingsystemisqueriedtoobtainthedefaultvalue*forthevariable.*/_tzset();/*Displayoperatingsystem-styledateandtime.*/_strtime(tmpbuf);printf("OStime:tttt%s",tmpbuf);_strdate(tmpbuf);printf("OSdate:tttt%

6、s",tmpbuf);/*GetUNIX-styletimeanddisplayasnumberandstring.*/time(

7、ureandadjustforPMifnecessary.*/today=localtime(tm_hour>12){strcpy(ampm,"PM");today->tm_hour-=12;}if(today->tm_hour==0)/*Adjustifmidnighthour.*/today->tm_hour=12;/*Notehowpointeradditionisusedtoskipthefirst11*charactersandprintfisusedtotrimoffterminating*characters

8、.*/printf("12-hourtime:tttt%.8s%s"