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As Neil pointed out there is no native solution in cmd. For anyone who has the option of using PowerShell instead, you could use the following: There may be a more succinct way of doing it but this worked for my purposes. |
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Get time in milliseconds on Windows and Linux
Please note that in this case the time expressed in milliseconds is not a conversion of the system time but is a number of milliseconds elapsed by a specific time in the past different according to operating system used. This value is useful if you want to calculate a timeout based to millisecods unit.
In Microsoft Windows you can call directly this API:
GetTickCount();
This call, based to MSDN documentation, return the number of milliseconds that have elapsed since the system was started, up to 49.7 days.
In Linux you can use this ready-made function:
#include <sys/time.h>
unsigned long GetMillisecondsTime()
{
struct timeval tv;
if(gettimeofday(&tv, NULL) != 0) return 0;
return (unsigned long)((tv.tv_sec * 1000ul) + (tv.tv_usec / 1000ul));
}
This function return the number of milliseconds elapsed since Epoch.
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The solution below seems OK to me. What do you think?
#include <stdio.h>
#include <time.h>
long timediff(clock_t t1, clock_t t2) {
long elapsed;
elapsed = ((double)t2 - t1) / CLOCKS_PER_SEC * 1000;
return elapsed;
}
int main(void) {
clock_t t1, t2;
int i;
float x = 2.7182;
long elapsed;
t1 = clock();
for (i=0; i < 1000000; i++) {
x = x * 3.1415;
}
t2 = clock();
elapsed = timediff(t1, t2);
printf("elapsed: %ld ms\n", elapsed);
return 0;
}
Reference: http://www.acm.uiuc.edu/webmonkeys/book/c_guide/2.15.html#clock
For Windows, GetSystemTime() is what you want. For POSIX, gettimeofday().
A cross platform way is to use ftime.
Windows specific link here: http://msdn.microsoft.com/en-us/library/aa297926(v=vs.60).aspx
Example below.
#include <stdio.h>
#include <sys\timeb.h>
int main()
{
struct timeb start, end;
int diff;
int i = 0;
ftime(&start);
while(i++ < 999) {
/* do something which takes some time */
printf(".");
}
ftime(&end);
diff = (int) (1000.0 * (end.time - start.time)
+ (end.millitm - start.millitm));
printf("\nOperation took %u milliseconds\n", diff);
return 0;
}
I ran the code above and traced through it using VS2008 and saw it actually calls the windows GetSystemTimeAsFileTime function.
Anyway, ftime will give you milliseconds precision.
Tags:
Time
C
Elapsed
Related
This code uses the GetLocalTime Windows API to get a more accurate time than VBA will supply, accurate to around 15 milliseconds. You can also do this using a combination of the VBA Date, Time and Timer functions but doing so runs the risk that the calls to the functions will be out of sync … you have to call one before the other(s) and the time will have moved on in-between — you run the risk of, for example, getting a date for ‘today’ using Date then by the time you have called Time to get the time, the actual time may have gone past midnight meaning you get the time for ‘tomorrow’. Unlikely but possible.
As it stands, the code below returns the date and time in a UK format (dd/mm/yy) … if you want another format, just adjust the order that the elements are added in the ConvertSystemTimeToString procedure e.g. for a US format (mm/dd/yy), swap tSystem.wDay and tSystem.wMonth.
In the declarations section of your module, add the following declarations:
And then add the following functions in the main body of the module:
Example usage:
Which prints, to the Immediate window:
Limitations: Windows only
October 5th, 2000, 12:16 PM
#1
Getting Time in MilliSeconds
Hi
How do I get the Total number of MilliSeconds elapsed since Jan 1, 1970 on Windows NT. I am using VC 6.0.
I would appreciate any help or code snippets to do this.
Thanks
Kishore
October 5th, 2000, 12:29 PM
#2
Re: Getting Time in MilliSeconds
CTime pastime(1970, 1, 1, 0,0,0,-1);
CTime currentTime = CTime::GetCurrentTime();
CTimeSpan elapsedTime = currentTime — pastime;
int numDaysPassed = elapsedTime.GetDays();
You can use other member functuons of CTimeSpan class to extract other time field, and to get the elapsed in the way you like.~ Rating helps serve better, no doubt
~ ks
October 5th, 2000, 12:30 PM
#3
Re: Getting Time in MilliSeconds
You should the function _ftime
Hope it helps
Olivier
October 5th, 2000, 12:30 PM
#4
Re: Getting Time in MilliSeconds
// Microsoft Copyright
#include <time.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/timeb.h>
#include <string.h>void main()
{
char tmpbuf[128], ampm[] = «AM»;
time_t ltime;
struct _timeb tstruct;
struct tm *today, *gmt, xmas = { 0, 0, 12, 25, 11, 93 };/* Set time zone from TZ environment variable. If TZ is not set,
* the operating system is queried to obtain the default value
* for the variable.
*/
_tzset();/* Display operating system-style date and time. */
_strtime( tmpbuf );
printf( «OS time:\t\t\t\t%s\n», tmpbuf );
_strdate( tmpbuf );
printf( «OS date:\t\t\t\t%s\n», tmpbuf );/* Get UNIX-style time and display as number and string. */
time( <ime );
printf( «Time in seconds since UTC 1/1/70:\t%ld\n», ltime );
printf( «UNIX time and date:\t\t\t%s», ctime( <ime ) );/* Display UTC. */
gmt = gmtime( <ime );
printf( «Coordinated universal time:\t\t%s», asctime( gmt ) );/* Convert to time structure and adjust for PM if necessary. */
today = localtime( <ime );
if( today->tm_hour > 12 )
{
strcpy( ampm, «PM» );
today->tm_hour -= 12;
}
if( today->tm_hour == 0 ) /* Adjust if midnight hour. */
today->tm_hour = 12;/* Note how pointer addition is used to skip the first 11
* characters and printf is used to trim off terminating
* characters.
*/
printf( «12-hour time:\t\t\t\t%.8s %s\n»,
asctime( today ) + 11, ampm );/* Print additional time information. */
_ftime( &tstruct );
printf( «Plus milliseconds:\t\t\t%u\n», tstruct.millitm );
printf( «Zone difference in seconds from UTC:\t%u\n»,
tstruct.timezone );
printf( «Time zone name:\t\t\t\t%s\n», _tzname[0] );
printf( «Daylight savings:\t\t\t%s\n»,
tstruct.dstflag ? «YES» : «NO» );/* Make time for noon on Christmas, 1993. */
if( mktime( &xmas ) != (time_t)-1 )
printf( «Christmas\t\t\t\t%s\n», asctime( &xmas ) );/* Use time structure to build a customized time string. */
today = localtime( <ime );/* Use strftime to build a customized time string. */
strftime( tmpbuf, 128,
«Today is %A, day %d of %B in the year %Y.\n», today );
printf( tmpbuf );
}
October 5th, 2000, 12:37 PM
#5
Re: Getting Time in MilliSeconds
I do not know of any one-step way to do this, but you could do that:
1. Get current time (to milliseconts)
SYSTEMTIME systime;
GetSystemTime(&systime);2. Construct two CTime objects, one from systime, and one from your date (Jan 1, 1970).
3. Calculate CTimeSpan between them two.
4. Get CTimeSpan::GetTotalSeconds().
5. Multiply by 1,000 and add milliseconds from you original systime.
6. Watch for int overflow!~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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