c 时间转移函数

/*
                 @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;

}
//该代码片段来自于: http://www.sharejs.com/codes/cpp/5675

#include <stdio.h>
#include <time.h>
int strtotime(char datetime[])
{
struct tm tm_time;
int unixtime;
strptime(datetime, "%Y-%m-%d %H:%M:%S", &tm_time);
 
unixtime = mktime(&tm_time);
return unixtime;
}
 
另附上几个时间相关的函数，做个笔记：
 
//当前时间
char* get_curr_time()
{
char* strtime = (char *)malloc(sizeof(char)*20);
memset(strtime, 0, sizeof(char)*20);
time_t now;
time(&now);
strftime(strtime, 20, "%Y-%m-%d %H:%M:%S", gmtime(&now));
printf("Info: current time %s\n", strtime);
return strtime;
}
 
//当前时间的unix时间戳
int get_curr_unixtime(void)
{
time_t now;
int unixtime = time(&now);
return unixtime;
}
 
//字符转unix时间戳
int strtotime(char datetime[])
{
struct tm tm_time;
int unixtime;
strptime(datetime, “%Y-%m-%d %H:%M:%S”, &tm_time);
 
unixtime = mktime(&tm_time);
return unixtime;
}