C++时间标准库时间time和系统时间的使用
1. C++标准库中的时间需要引用time.h，可以取的本地时间或者格林威治时间，只能精确到秒#include <iostream>
/*包含time头文件*/
#include <time.h>
using namespace std;
int main()
{
//time_t是long类型，精确到秒，是当前时间和1970年1月1日零点时间的差
const time_t t = time(NULL);
cout<<"current time is "<<t<<endl;
/*本地时间：日期，时间 年月日，星期，时分秒*/
struct tm* current_time = localtime(&t);
printf("current year is %d;current month is %d;current date of month is %d\r\n",
1900 + current_time->tm_year,
1 + current_time->tm_mon/*此month的范围为0-11*/,
current_time->tm_mday);
printf("current day of year is %d;current day in week is %d\r\n",
current_time->tm_yday,/*当前日期是今年的第多少天 */
current_time->tm_wday/*days since Sunday - */);
printf("time part %d:%d:%d \r\n",
current_time->tm_hour,
current_time->tm_min,
current_time->tm_sec);
printf("\t本地时间：%d-%d-%d %d:%d:%d\r\n",
current_time->tm_year + 1900,
current_time->tm_mon + 1,
current_time->tm_mday,
current_time->tm_hour,
current_time->tm_min,
current_time->tm_sec);
/*格林威治时间*/
struct tm* current_gmtime = gmtime(&t);
printf("格林威治时间：%d-%d-%d %d:%d:%d\r\n",
current_gmtime->tm_year + 1900,
current_gmtime->tm_mon + 1,
current_gmtime->tm_mday,
current_gmtime->tm_hour,
current_gmtime->tm_min,
current_gmtime->tm_sec);
system("pause");
return 0;
}
2. 系统时间 SYSTEMTIME 使用时要引用windows.h，可以精确到毫秒级别
#include <iostream>
#include <Windows.h>
int main(){
//声明变量
SYSTEMTIME sys_time;
//将变量值设置为本地时间
GetLocalTime( &sys_time );
//输出时间
printf( "%4d/%02d/%02d %02d:%02d:%02d.%03d 星期%1d\n",sys_time.wYear,
sys_time.wMonth,
sys_time.wDay,
sys_time.wHour,
sys_time.wMinute,
sys_time.wSecond,
sys_time.wMilliseconds,
sys_time.wDayOfWeek);
system("time");
system("pause");
return 0;
}
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