C++日期和時間戳相互轉換的代碼

日期字符轉化成時間戳
時間戳轉化成日期

           /
                 @param       date
                 @param       formart  of date
                 @return      time_t
                 @author      yangqijun@outlook.com
               /
              time_t strtotime(char const date,char const format="%Y%m%d%H%M%S")
              {
                      struct tm tm;
                      strptime(date,format, &tm) ;
                      time_t ft=mktime(&tm);
                      return ft;
              }

string   timetodate(time_t const timer)
              {
                      struct tm *l=localtime(&timer);

                  char buf[128];
                  snprintf(buf,sizeof(buf),"%04d-%02d-%02d %02d:%02d:%02d",l->tm_year+1900,l->tm_mon+1,l->tm_mday,l->tm_hour,l->tm_min,l->tm_sec);
                  string s(buf);
                  return s;


          }</pre>