计算某一天的前一天的日期 

 1 //计算某一天的前一天的日期  日期格式：YYYY-MM-DD
 2 bool GetTheDayBefore(const std::string &strOneDate,std::string &TheDayBefore)
 3 {
 4     int iYear,iMonth,iDay;
 5     if (10 != strOneDate.length())   //形如xxxx-xx-xx格式的日期长度为10
 6     {
 7         return false;
 8     }
 9 
10     iYear = atoi(strOneDate.substr(0,4).c_str());
11     iMonth = atoi(strOneDate.substr(5,2).c_str());
12     iDay   = atoi(strOneDate.substr(8,2).c_str());
13 
14     int iWeekDay = -1;
15     struct tm tTime;
16     time_t t_of_day;
17     tTime.tm_year=iYear-1900;
18     tTime.tm_mon=iMonth-1;
19     tTime.tm_mday=iDay;
20     tTime.tm_hour=0;
21     tTime.tm_min=0;
22     tTime.tm_sec=0;
23     tTime.tm_isdst=0;
24     t_of_day=mktime(&tTime);
25     localtime_s(&tTime, &t_of_day);
26 
27     t_of_day = t_of_day - 24*3600;
28     localtime_s(&tTime, &t_of_day);
29     char buffer[Date_String_Size] = {0};
30     sprintf_s(buffer, Date_String_Size, "%04d-%02d-%02d", tTime.tm_year+1900, tTime.tm_mon+1, tTime.tm_mday);
31     TheDayBefore = buffer;
32 
33     return true;
34 }

 

posted @ 2013-05-23 16:12  岁月漫步  阅读(724)  评论(0)    收藏  举报