C语言时间处理

获取毫秒时间戳

#ifndef HELLOWORDC_TIME_UTILS_H
#define HELLOWORDC_TIME_UTILS_H

#if defined(__WIN32)
#include <sys/timeb.h>
#elif defined(__UNIX__)  || defined(__APPLE__)
#include <sys/time.h>
#else
#include <time.h>
#endif

typedef long long  long_time_t;

//返回毫秒时间戳
long_time_t TimeInMillisecond(void){
#if defined(__WIN32)
    struct timeb time_buffer;
    ftime(&time_buffer);
    return time_buffer.time * 1000LL +time_buffer.millitm;
#elif defined(__unix__) || defined(__APPLE__)
    struct timeval time_value;
    gettimeofday(&time_value,NULL);
    return time_value.tv_sec * 1000LL + time_value.tv_usec / 1000;
#elif defined(__STDC__)  && __STDC_VERSION__ == 201112L
    struct timespec timespec_value;
    timespec_get(&timespec_value,TIME_UTC);
    return timespec_value.tv_sec * 1000LL + timespec_value.tv_nsec / 1000000;
#else
   time_t current_time=time(NULL);
   return current_time * 1000LL;
#endif
}

#endif //HELLOWORDC_TIME_UTILS_H

获取日历结构体

#include <time.h>

//获取日历结构体
time_t cur_time;
time(&cur_time);
struct tm *calender_time=localtime(&cur_time);
//年
printf("%d\n",calender_time->tm_year);
//月
printf("%d\n",calender_time->tm_mon);
//日
printf("%d\n",calender_time->tm_mday);
//时
printf("%d\n",calender_time->tm_hour);
//分
printf("%d\n",calender_time->tm_min);
//秒
printf("%d\n",calender_time->tm_sec);

时间结构体转换

//获取时间戳
time_t cur_time;
time(&cur_time);
//获取本地日历时间结构体
struct tm *calender_time=localtime(&cur_time);
calender_time->tm_sec=70;
//通过mktime函数将tm结构体转换time_t结构体类型
time_t return_time=mktime(&calender_time);
//获取GMT时间
struct tm *gm=gmtime(cur_time);

时间类型格式化字符串

time_t  cur_time;
time(&cur_time);
struct tm *calender=localtime(&cur_time);
//Sun Sep 26 03:45:34 2021
char *strEgDate1=asctime(calender);
printf("%s \n",strEgDate1);

//时间结构体转换字符串，并且格式化时间
char strTime[20];
//格式化函数
strftime(strTime,20,"%Y-%m-%d %H:%M:%S",calender);
printf("%s \n",strTime);

字符串类型转时间

char *time="2021-09-26 00:03:12";
struct tm parseTime;
//字符串转时间
sscanf(time,"%4d-%2d-%2d %2d:%2d:%2d",
    &parseTime.tm_year,
    &parseTime.tm_mon,
    &parseTime.tm_mday,
    &parseTime.tm_hour,
    &parseTime.tm_min,
    &parseTime.tm_sec);

//年
printf("%d\n",parseTime.tm_year);
//月
printf("%d\n",parseTime.tm_mon);
//日
printf("%d\n",parseTime.tm_mday);
//时
printf("%d\n",parseTime.tm_hour);
//分
printf("%d\n",parseTime.tm_min);
//秒
printf("%d\n",parseTime.tm_sec);

两个时间差

time_t  start_time=time(NULL);
time_t  end_time=time(NULL);
//两个时间差
double diff=difftime(start_time,end_time);
printf("%f",diff);

两个时间毫秒差

clock_t  start_time_c=clock();
clock_t  end_time_c=clock();
//时间毫秒
printf("%f",(end_time_c-start_time_c)*1.0/CLOCKS_PER_SEC);