C语言-时间处理（当前时间，时间戳转时间，时间转时间戳）

C语言-时间处理（当前时间，时间戳转时间，时间转时间戳）

输出当前时间

#include <stdio.h>
#include <time.h>

int main ()
{
   time_t rawtime;
   struct tm *info;//指向tm结构的指针
   char buffer[80];
 
   time( &rawtime );
   
   info = localtime( &rawtime );
 
   strftime(buffer, 80, "%Y-%m-%d %H:%M:%S", info);
   printf("格式化的日期 & 时间 : |%s|\n", buffer );
  
   return(0);
}

结果输出：

时间戳转时间

#include <stdio.h>
#include <time.h>
#include <stdint.h>

typedef struct{
	uint16_t year;
    uint8_t month;
    uint8_t day;
    uint8_t hour;
    uint8_t minute;
    uint8_t second;
}bj_time;

bj_time timestamp_to_bj_time(time_t timestamp);
time_t bj_time_to_timestamp(bj_time time);

int main()
{
   time_t rawtime = 1592932611;//时间戳, time_t是长整型变量
   printf("given timestamp: %d\n", rawtime);
   struct tm *info;//指向tm结构的指针
   char buffer[80];
   info = localtime( &rawtime );
   strftime(buffer, 80, "%Y-%m-%d %H:%M:%S", info);
   printf("格式化的日期 & 时间 : |%s|\n", buffer );
   printf("------------------\n");
   bj_time time;
   time = timestamp_to_bj_time(rawtime);
    /* 2020-6-25 19:11:50 */
   printf("the time of given timestamp: %d-%d-%d %d:%d:%d\r\n",
        time.year, time.month, time.day, time.hour, time.minute, time.second);
//   time_t timestamp;
//   timestamp = bj_time_to_timestamp(time);
//   printf("%d\r\n", timestamp);
   return(0);
}


bj_time timestamp_to_bj_time(time_t timestamp)
{
    bj_time time;
    
    struct tm *t;
    
    /* 加上8个小时 */
    timestamp += 8*60*60;
    t = localtime(&timestamp);
    
    /* 日期修正 */
    time.year = t->tm_year + 1900;
    time.month = t->tm_mon + 1;
    time.day = t->tm_mday;
    time.hour = t->tm_hour;
    time.minute = t->tm_min;
    time.second = t->tm_sec;
    
    return time;
}

time_t bj_time_to_timestamp(bj_time time)
{
    struct tm t;
    time_t timestamp = 0;
    
    /* 日期修正 */
    t.tm_year = time.year - 1900;
    t.tm_mon = time.month - 1;
    t.tm_mday = time.day;
    t.tm_hour = time.hour;
    t.tm_min = time.minute;
    t.tm_sec = time.second;

    timestamp = mktime(&t) - 8*60*60;
    return timestamp;
}

结果输出：

时间转为时间戳

#include <stdio.h>
#include <time.h>
#include <stdint.h>

typedef struct{
	uint16_t year;
    uint8_t month;
    uint8_t day;
    uint8_t hour;
    uint8_t minute;
    uint8_t second;
}bj_time;

bj_time timestamp_to_bj_time(time_t timestamp);
time_t bj_time_to_timestamp(bj_time time);

int main()
{
   time_t rawtime = 1592932611;//时间戳, time_t是长整型变量
   struct tm *info;//指向tm结构的指针
   char buffer[80];
   info = localtime( &rawtime );
   strftime(buffer, 80, "%Y-%m-%d %H:%M:%S", info);
   printf("格式化的日期 & 时间 : |%s|\n", buffer );
   printf("------------------\n");
   bj_time time;
   time = timestamp_to_bj_time(rawtime);
    /* 2020-6-25 19:11:50 */
   printf("%d-%d-%d %d:%d:%d\r\n",
        time.year, time.month, time.day, time.hour, time.minute, time.second);
   time_t timestamp;
   timestamp = bj_time_to_timestamp(time);
   printf("the timestamp of given time: %d\r\n", timestamp);
   return(0);
}


bj_time timestamp_to_bj_time(time_t timestamp)
{
    bj_time time;
    
    struct tm *t;
    
    /* 加上8个小时 */
    timestamp += 8*60*60;
    t = localtime(&timestamp);
    
    /* 日期修正 */
    time.year = t->tm_year + 1900;
    time.month = t->tm_mon + 1;
    time.day = t->tm_mday;
    time.hour = t->tm_hour;
    time.minute = t->tm_min;
    time.second = t->tm_sec;
    
    return time;
}

time_t bj_time_to_timestamp(bj_time time)
{
    struct tm t;
    time_t timestamp = 0;
    
    /* 日期修正 */
    t.tm_year = time.year - 1900;
    t.tm_mon = time.month - 1;
    t.tm_mday = time.day;
    t.tm_hour = time.hour;
    t.tm_min = time.minute;
    t.tm_sec = time.second;

    timestamp = mktime(&t) - 8*60*60;
    return timestamp;
}

结果输出：