Question

我有象“2010-03-01”这样的日期说明格式,我希望得到像星期一一样的“tm_wday”。

难道有人会问我如何在c中做到这一点?

Answer 1

strptime( 职能:

char *strptime(const char *s, const char *format, struct tm *tm);

The strptime() function is the converse function to strftime(3) and converts the character string pointed to by s to values which are stored in the tm structure pointed to by tm, using the format specified by format.

Answer 2

使用<代码>mktime()计算周日。

#include <memory.h>
#include <stdio.h>
#include <time.h>

int main(void) {
  const char *p = "2010-03-01";
  struct tm t;
  memset(&t, 0, sizeof t);  // set all fields to 0
  if (3 != sscanf(p,"%d-%d-%d", &t.tm_year, &t.tm_mon, &t.tm_mday)) {
    ; // handle error;
  }
  // Adjust to struct tm references
  t.tm_year -= 1900;
  t.tm_mon--;
  // Calling mktime will set the value of tm_wday
  if (mktime(&t) < 0) {
    ; // handle error;
  }
  printf("DOW(%s):%d (0=Sunday, 1=Monday, ...)
", p, t.tm_wday);
  // DOW(2010-03-01):1 (0=Sunday, 1=Monday, ...)
  return 0;
}

友情链接