学步园

LINUX中时间有两种：

1）日历时间

2）进程时间

日历时间顾名思义即用来获取日历；

主要涉及到的函数有：

time(time_t*);

stime(time_t*);

tm* gmtime(time_t*);

tm* localtime(time_t*);

char *strftime(tm*);

char *asctime(tm*);

time_t* mktime(tm*);

数据结构如下：

time_t

struct tm{

  int tm_sec;

  int tm_min;

  int tm_hour;

  int tm_mday;

  int tm_wday;

  int tm_yday;

  int tm_year;

  int tm_isdst;

}

转换关系如下图：

示例代码如下：

struct utsname aname;<br /> int a=uname(&aname);<br /> cout << a;<br /> cout << endl;<br /> cout << aname.sysname<< endl;<br /> cout << aname.machine<< endl;<br /> cout << aname.release<< endl;<br /> cout << aname.version<<endl;<br /> cout << aname.nodename<< endl;</p> <p> time_t time1;<br /> time_t time2;<br /> time2=time(&time1);<br /> cout << time1 << endl;<br /> cout << time2 << endl;</p> <p> struct tm *tm1;</p> <p> tm1=localtime(&time1);</p> <p> cout << tm1->tm_sec<<endl;<br /> cout << tm1->tm_min<<endl;<br /> cout << tm1->tm_hour<<endl;<br /> cout << tm1->tm_mday<<endl;<br /> cout << tm1->tm_mon<<endl;<br /> cout << tm1->tm_year<<endl;<br /> cout << tm1->tm_wday<<endl;<br /> cout << tm1->tm_yday<<endl;</p> <p> char *css;<br /> css=asctime(tm1);</p> <p> cout << css;</p> <p> size_t size=strftime(css,100,"%Y-%m-%d %H-%M-%S %w",tm1);</p> <p> cout << size << ":"<<css;