LINUX系统编程之日历时间

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