C语言学习：获取日历时间

时间戳表示从1970年1月1日到现在的秒数。

 1 #include <io_utils.h>
 2 #include <time_utils.h>
 3 #include <time.h>
 4 
 5 int main() {
 6   time_t current_time;
 7   time(&current_time);
 8   PRINT_LLONG(current_time);
 9   struct tm *calendar_time = localtime(&current_time);
10   PRINT_INT(calendar_time->tm_year);
11   PRINT_INT(calendar_time->tm_mon);
12   PRINT_INT(calendar_time->tm_mday);
13   PRINT_INT(calendar_time->tm_hour);
14   PRINT_INT(calendar_time->tm_min);
15   PRINT_INT(calendar_time->tm_sec);
16 
17   calendar_time->tm_sec = 70;
18 
19   time_t current_time2 = mktime(calendar_time);
20   PRINT_LLONG(current_time2);
21   PRINT_INT(calendar_time->tm_year);
22   PRINT_INT(calendar_time->tm_mon);
23   PRINT_INT(calendar_time->tm_mday);
24   PRINT_INT(calendar_time->tm_hour);
25   PRINT_INT(calendar_time->tm_min);
26   PRINT_INT(calendar_time->tm_sec);
27   struct tm *gmt = gmtime(&current_time);
28 
29   PRINT_INT(gmt->tm_year);
30   PRINT_INT(gmt->tm_mon);
31   PRINT_INT(gmt->tm_mday);
32   PRINT_INT(gmt->tm_hour);
33   PRINT_INT(gmt->tm_min);
34   PRINT_INT(gmt->tm_sec);
35   return 0;
36 }

 三个方法

localtime: 获取本地日历时间

mktime: 将calendar类型的时间进行格式化，转换成一个time_t类型的时间戳。

gmttime: 获取格林威治日历时间