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#include <iostream>
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#include <time.h>
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#include <sys/time.h>
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using namespace std;
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int main()
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{
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time_t t; //秒时间
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tm* local; //本地时间
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tm* gmt; //格林威治时间
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char buf[128]= {0};
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t = time(NULL); //获取目前秒时间
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local = localtime(&t); //转为本地时间
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strftime(buf, 64, "%Y-%m-%d %H:%M:%S", local);
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std::cout << buf << std::endl;
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gmt = gmtime(&t);//转为格林威治时间
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strftime(buf, 64, "%Y-%m-%d %H:%M:%S", gmt);
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std::cout << buf << std::endl;
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struct timeval tv;
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struct timezone tz;
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gettimeofday(&tv, &tz);
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t = tv.tv_sec;
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local = localtime(&t); //转为本地时间
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strftime(buf, 64, "%Y-%m-%d %H:%M:%S", local);
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std::cout << buf << std::endl;
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gmt = gmtime(&t);//转为格林威治时间
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strftime(buf, 64, "%Y-%m-%d %H:%M:%S", gmt);
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std::cout << buf << std::endl;
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}
输出
2017-04-19 19:26:45
2017-04-19 11:26:45
2017-04-19 19:26:45
2017-04-19 11:26:45
$ date 实际时间
2017年 04月 19日 星期三 19:26:47 CST
可以看到
http://blog.csdn.net/ncepubdtb/article/details/38899505
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1、常用的时间存储方式
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1)time_t类型,这本质上是一个长整数,表示从1970-01-01 00:00:00到目前计时时间的秒数,如果需要更精确一点的,可以使用timeval精确到毫秒。
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2)tm结构,这本质上是一个结构体,里面包含了各时间字段
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struct tm {
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int tm_sec;
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int tm_min;
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int tm_hour;
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int tm_mday;
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int tm_mon;
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int tm_year;
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int tm_wday;
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int tm_yday;
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int tm_isdst;
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};
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其中tm_year表示从1900年到目前计时时间间隔多少年,如果是手动设置值的话,tm_isdst通常取值-1。
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2、常用的时间函数
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time_t time(time_t *t);
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char *asctime(const struct tm *tm);
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char *ctime(const time_t *timep);
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struct tm *gmtime(const time_t *timep);
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struct tm *localtime(const time_t *timep);
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time_t mktime(struct tm *tm);
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int gettimeofday(struct timeval *tv, struct timezone *tz);
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double difftime(time_t time1, time_t time2);
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3、时间与字符串的转换
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需要包含的头文件如下
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#include
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#include
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#include
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#include
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1)unix/windows下时间转字符串参考代码
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time_t t;
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tm* local;
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tm* gmt;
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char buf[128]= {0};
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t = time(NULL);
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local = localtime(&t);
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strftime(buf, 64, "%Y-%m-%d %H:%M:%S", local);
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std::cout << buf << std::endl;
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gmt = gmtime(&t);
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strftime(buf, 64, "%Y-%m-%d %H:%M:%S", gmt);
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std::cout << buf << std::endl;
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2)unix字符串转时间参考代码
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tm tm_;
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time_t t_;
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char buf[128]= {0};
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strcpy(buf, "2012-01-01 14:00:00");
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strptime(buf, "%Y-%m-%d %H:%M:%S", &tm_);
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tm_.tm_isdst = -1;
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t_ = mktime(&tm_);
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t_ += 3600;
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tm_ = *localtime(&t_);
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strftime(buf, 64, "%Y-%m-%d %H:%M:%S", &tm_);
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std::cout << buf << std::endl;
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3)由于windows下没有strptime函数,所以可以使用scanf来格式化
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time_t StringToDatetime(char *str)
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{
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tm tm_;
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int year, month, day, hour, minute,second;
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sscanf(str,"%d-%d-%d %d:%d:%d", &year, &month, &day, &hour, &minute, &second);
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tm_.tm_year = year-1900;
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tm_.tm_mon = month-1;
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tm_.tm_mday = day;
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tm_.tm_hour = hour;
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tm_.tm_min = minute;
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tm_.tm_sec = second;
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tm_.tm_isdst = 0;
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time_t t_ = mktime(&tm_);
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return t_;
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}
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