获取时间的C C++函数?

获取时间的C C++函数


aluckdog
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慕标琳琳

1、C语言中读取系统时间的函数为time(),其函数原型为:#include <time.h>time_t time( time_t * ) ;time_t就是long,函数返回从1970年1月1日(MFC是1899年12月31日)0时0分0秒,到现在的的秒数。2、C语言还提供了将秒数转换成相应的时间格式的函数:char * ctime(const time_t *timer); //将日历时间转换成本地时间,返回转换后的字符串指针 可定义字符串或是字符指针来接收返回值struct tm * gmtime(const time_t *timer); //将日历时间转化为世界标准时间(即格林尼治时间),返回结构体指针 可定义struct tm *变量来接收结果struct tm * localtime(const time_t * timer); //将日历时间转化为本地时间,返回结构体指针 可定义struct tm *变量来接收结果3、例程:12345678910111213141516171819202122#include&nbsp;<time.h>void&nbsp;main(){time_t&nbsp;t;struct&nbsp;tm&nbsp;*pt&nbsp;;char&nbsp;*pc&nbsp;;time(&t);pc=ctime(&t)&nbsp;;&nbsp;printf("ctime:%s",&nbsp;pc&nbsp;);pt=localtime(&t)&nbsp;;&nbsp;printf("year=%d",&nbsp;pt->tm_year+1900&nbsp;);}//时间结构体struct&nbsp;tm&nbsp;说明:struct&nbsp;tm&nbsp;{int&nbsp;tm_sec;&nbsp;/*&nbsp;秒&nbsp;–&nbsp;取值区间为[0,59]&nbsp;*/int&nbsp;tm_min;&nbsp;/*&nbsp;分&nbsp;-&nbsp;取值区间为[0,59]&nbsp;*/int&nbsp;tm_hour;&nbsp;/*&nbsp;时&nbsp;-&nbsp;取值区间为[0,23]&nbsp;*/int&nbsp;tm_mday;&nbsp;/*&nbsp;一个月中的日期&nbsp;-&nbsp;取值区间为[1,31]&nbsp;*/int&nbsp;tm_mon;&nbsp;/*&nbsp;月份(从一月开始,0代表一月)&nbsp;-&nbsp;取值区间为[0,11]&nbsp;*/int&nbsp;tm_year;&nbsp;/*&nbsp;年份,其值等于实际年份减去1900&nbsp;*/int&nbsp;tm_wday;&nbsp;/*&nbsp;星期&nbsp;–&nbsp;取值区间为[0,6],其中0代表星期天,1代表星期一,以此类推&nbsp;*/int&nbsp;tm_yday;&nbsp;/*&nbsp;从每年的1月1日开始的天数&nbsp;–&nbsp;取值区间为[0,365],其中0代表1月1日,1代表1月2日,以此类推&nbsp;*/int&nbsp;tm_isdst;&nbsp;/*&nbsp;夏令时标识符,实行夏令时的时候,tm_isdst为正。不实行夏令时的进候,tm_isdst为0;不了解情况时,tm_isdst()为负。*/};

慕码人8056858

常用的与时间有关的Win32 API有两个:GetSystemTime(); 与 SetSystemTime(); 下面是函数原型:VOID GetSystemTime(LPSYSTEMTIME lpSystemTime);BOOL SetSystemTime( const SYSTEMTIME *lpSystemTime );我们查一下 MSDN 看看 LPSYSTEMTIME 与 SYSTEMTIME 是什么:typedef struct _SYSTEMTIME {WORD wYear;WORD wMonth;WORD wDayOfWeek;WORD wDay;WORD wHour;WORD wMinute;WORD wSecond;WORD wMilliseconds;} SYSTEMTIME, *PSYSTEMTIME;void main(){SYSTEMTIME st;GetSystemTime(&st); // Win32 API 获取系统当前时间,并存入结构体st中......下面 你自己处理。}

小唯快跑啊

/* asctime example */#include <stdio.h>#include <time.h>int main (){time_t rawtime;struct tm * timeinfo;time ( &rawtime );timeinfo = localtime ( &rawtime );printf ( "The current date/time is: %s", asctime (timeinfo) );return 0;}/* localtime example */#include <stdio.h>#include <time.h>int main (){time_t rawtime;struct tm * timeinfo;time ( &rawtime );timeinfo = localtime ( &rawtime );printf ( "Current local time and date: %s", asctime (timeinfo) );return 0;}/* ctime example */#include <stdio.h>#include <time.h>int main (){time_t rawtime;time ( &rawtime );printf ( "The current local time is: %s", ctime (&rawtime) );return 0;}/* gmtime example */#include <stdio.h>#include <time.h>#define MST (-7)#define UTC (0)#define CCT (+8)int main (){time_t rawtime;tm * ptm;time ( &rawtime );ptm = gmtime ( &rawtime );puts ("Current time around the World:");printf ("Phoenix, AZ (U.S.) : %2d:%02d\n", (ptm->tm_hour+MST)%24, ptm->tm_min);printf ("Reykjavik (Iceland) : %2d:%02d\n", (ptm->tm_hour+UTC)%24, ptm->tm_min);printf ("Beijing (China) : %2d:%02d\n", (ptm->tm_hour+CCT)%24, ptm->tm_min);return 0;}
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