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：

[cpp] view plaincopyprint?

struct utsname aname;

int a=uname(&aname);

1. cout << a;
2. cout << endl;
3. cout << aname.sysname<< endl;
4. cout << aname.machine<< endl;
5. cout << aname.release<< endl;
6. cout << aname.version<<endl;
7. cout << aname.nodename<< endl;
10. time_t time1;
11. time_t time2;
12. time2=time(&time1);
13. cout << time1 << endl;
14. cout << time2 << endl;
16. struct tm *tm1;
18. tm1=localtime(&time1);
20. cout << tm1->tm_sec<<endl;
21. cout << tm1->tm_min<<endl;
22. cout << tm1->tm_hour<<endl;
23. cout << tm1->tm_mday<<endl;
24. cout << tm1->tm_mon<<endl;
25. cout << tm1->tm_year<<endl;
26. cout << tm1->tm_wday<<endl;
27. cout << tm1->tm_yday<<endl;
29. char *css;
30. css=asctime(tm1);
32. cout << css;
34. size_t size=strftime(css,100,"%Y-%m-%d %H-%M-%S %w",tm1);
36. cout << size << ":"<<css;