时间字符串与时间戳相互转换

#include <stdio.h>
#include <time.h>
//时间戳转为字符串
int time_long2Str(long ltime, char *timeStr){
	time_t tmNow = ltime;
	struct tm stRectm;
	localtime_r(&tmNow, &stRectm);
	sprintf(timeStr,"%04d-%02d-%02d %02d:%02d:%02d",
		stRectm.tm_year + 1900, stRectm.tm_mon + 1,stRectm.tm_mday,
		stRectm.tm_hour,stRectm.tm_min,stRectm.tm_sec);
	return 0;
}

//时间字符串转为时间戳
long metis_strptime(char *str_time){
  struct tm stm;  
  strptime(str_time, "%Y-%m-%d %H:%M:%S",&stm);
  long t = mktime(&stm);
  return t;
}


int main(int argc, char *argv[])
{
	char time_str[]="2021-04-20 16:16:07";
	char newTimeStr[32]={0};
	long time_long = 0l;
	time_long = metis_strptime(time_str);
	printf("time str:%s long:%lld\n",time_str, time_long );
	time_long2Str(time_long, newTimeStr);
	printf("out time str:%s\n", newTimeStr);
	return 0;
}