cHow to obtain the time accurate to the millisecond

I suggest you take a look at the blog post above.

There is no standard interface in C that can be accurate to the millisecond, and only the API related to the operating system can be called.

datetime(3 6) or timestamp(3 6).

Just save it directly, mainly for the settings of database fields.

"yyyy-mm-dd ");

If the database requires the format to be 2017-07-31, and milliseconds are points, you need to use the example above!

clock_t t1,t1;

t1=clock();

t2=clock();

t2-t1) is seconds, but this is a decimal and can be obtained in milliseconds.

First of all, I want to make it clear, this is what I know, and I will be OK if I baidu it often.

#include

#include

void main ()

include -- required time function header file.

time t -- time type ( definition).

structtm -- the temporal structure, defined as follows:

int tm_sec;

int tm_min;

int tm_hour;

int tm_mday;

int tm_mon;

int tm_year;

int tm_wday;

int tm_yday;

int tm_isdst;

time ( rawtime );The acquisition time, measured in seconds, is counted from January 1, 1970 onwards, and is stored in rawtime

localtime ( rawtime );Convert to local time, TM time structure.

asctime() to the standard ASCII time format:

Day, month, day, hour: minute: second, year.

The format you want can be output like this:

printf ( 4d-%02d-%02d %02d:%02d:%02d",1900+timeinfo->tm_year, 1+timeinfo->tm_mon,timeinfo->tm_mday,timeinfo->tm_hour,timeinfo->tm_min,timeinfo->tm_sec);

It is to print tm directly, tm year is calculated from 1900, so you have to add 1900, and monthtm mon, calculated from 0, so you have to add 1

You can see the rest at a glance.

clock_t t1,t1;

t1=clock();

t2=clock();

t2-t1) is seconds, but this is a decimal and can be obtained in milliseconds.

You try the following program:

#include

#include

#include

int main()

I'm running under vc++ and I can get the timing in milliseconds.

The main thing to write is how to get the millisecond value of time:

#include

#include

#include

#include

int main( void )

time(time t*), please refer to msdn for the required header file

It doesn't make much sense to monitor time with the program itself, because the program runs in a system with irregular system resources.

CPU, memory, scheduling is invisible to us, every program running in the system CPU, memory occupation is jitter, may be in a certain period of time when the system resources are tight, without scheduling to your program, it will be slow, this is difficult to say.