*******************求一时间加减函数*******************

[lynx1111]

第一个输入参数：时间字符串，格式 2010-02-14 14:02:38 (如果此格式不方便，其他类似的格式也行)
第二个输入参数：数字，例子：8，-8
第三个输入参数：类型，共四种：D,H,M,S。表示天，小时，分，秒。
返回值为时间字符串

例子：
DatetimeAdd('2010-02-14 14:02:38',8,'D') 返回：2010-02-22 14:02:38
DatetimeAdd('2010-02-14 14:02:38',-8,'H') 返回：2010-02-14 06:02:38
DatetimeAdd('2010-02-14 14:02:38',-8,'M') 返回：2010-02-14 13:54:38
DatetimeAdd('2010-02-14 14:02:38',8,'S') 返回：2010-02-14 14:02:46

请写具体点，本人极端菜鸟。多谢！

[dskit]

/*test.cpp*/

#include<iostream>
#include<ctime>
#include<stdlib.h>

using namespace std;

int main(int argc, char* argv[])
{

	char time[] = "2009-10-25 12:34:23";
	struct tm t;
	sscanf(time,"%d-%d-%d %d:%d:%d",&t.tm_year, &t.tm_mon, &t.tm_mday, &t.tm_hour, &t.tm_min, &t.tm_sec);
	t.tm_year -= 1900;
	t.tm_mon  -= 1;
	int diff = 0;
	char type = 'D';
	scanf("%d %c", &diff, &type);
	time_t cur_t = 0;
	cur_t = mktime(&t);
	switch(type)
	{
		case 'D':
			cur_t = cur_t + diff * 24 * 60 * 60;
			break;
		case 'H':
			cur_t += diff * 60 * 60;	
			break;
		case 'M':
			cur_t += diff * 60;
			break;
		case 'S':
			cur_t += diff;
			break;
	}

	printf(asctime(&t));
	printf(ctime(&cur_t));
	return 0;
}

c++ test.cpp
./a.exe
2 D
.....

./a.exe
-2 D
.....

[最帅马老师]

大概思路先用ctime类进行转换，然后加或减去相应值，再转为字符串即可

早上工作忙，下午帮你整一个

[太乙]

#include <iostream>
  #include <string>
  #include <time.h>
  using namespace std;
  
  string DatetimeAdd(const char* time, int num, char type)
  {
      time_t secs = 0;
      switch (type)
      {
          case 'D':
              secs = num * 24 * 60 * 60;
              break;  
          case 'H':
              secs = num * 60 * 60;
              break;  
          case 'M':
              secs = num * 60;
              break;  
          case 'S':
              secs = num;
              break;  
          default:
              return "";
      }
      struct tm _tmp; 
      strptime(time, "%Y-%m-%d %T", &_tmp); 
      time_t oldTime = mktime(&_tmp);
      oldTime += secs;
      struct tm* _res = localtime(&oldTime);
      char buf[20];
      sprintf(buf,"%04d-%02d-%02d %02d:%02d:%02d", _res->tm_year + 1900, _res->tm_mon + 1, _res->tm_mday,
              _res->tm_hour, _res->tm_min, _res->tm_sec);
      
      return string(buf);
      
      
  }
  int main()
  {
      char buf[20] = "2010-02-14 14:02:38"; 
      cout << DatetimeAdd(buf, 8, 'D');
      return 0;
  }

[forster]

推荐COleDateTime类
是ctime的超集
ctime好像超过3000多年就异常了
COleDateTime支持到9999年

[最帅马老师]

引用 2 楼 hqin6 的回复:

C/C++ code#include<iostream>
#include<string>
#include<time.h>usingnamespace std;string DatetimeAdd(constchar* time,int num,char type)
{
time_t secs=0;switch (type)
{case'D':
secs= num*24*60*60;break;case'H':
secs= num*60*60;break;case'M':
secs= num*60;break;case'S':
secs= num;break;default:return"";
}struct tm _tmp;
strptime(time,"%Y-%m-%d %T",&_tmp);
time_t oldTime= mktime(&_tmp);
oldTime+= secs;struct tm* _res= localtime(&oldTime);char buf[20];
sprintf(buf,"%04d-%02d-%02d %02d:%02d:%02d", _res->tm_year+1900, _res->tm_mon+1, _res->tm_mday,
_res->tm_hour, _res->tm_min, _res->tm_sec);returnstring(buf);


}int main()
{char buf[20]="2010-02-14 14:02:38";
cout<< DatetimeAdd(buf,8,'D');return0;
}

正解