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;