Date / time not right in C

I think my Debian image uses network to set time/date

If I type "date" command then I get valid date/time, eg...
Tue Jul 10 22:38:40 BST 2012

Yet the C library functions like...

timeinfo = localtime(&rawtime) ;
strftime(strResponse,128,"%H:%M:%S %d-%b-%Y",timeinfo);

returns the "zero" time of 01:00:00 01-Jan-1970

Does anyone have an idea why this is please?


Thanks,
Paul.

have you checked the numeric value of rawtime or the contents of timeinfo - they're probably ending up as zero

I think my Debian image uses network to set time/date

If I type "date" command then I get valid date/time, eg...
Tue Jul 10 22:38:40 BST 2012

Yet the C library functions like...

timeinfo = localtime(&rawtime) ;
strftime(strResponse,128,"%H:%M:%S %d-%b-%Y",timeinfo);

returns the "zero" time of 01:00:00 01-Jan-1970

Does anyone have an idea why this is please?


Thanks,
Paul.

Probably stating the obvious but did you actually set rawtime? ie. did you do:

rawtime = time (NULL) ;

beforehand?

This:

Code: Select all

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

int main ()
{
  struct tm *timeinfo ;
  time_t rawtime ;
  char strResponse [128] ;

  rawtime = time (NULL) ;
  timeinfo = localtime(&rawtime) ; 
  strftime(strResponse,128,"%H:%M:%S %d-%b-%Y",timeinfo); 

  printf ("%s\n", strResponse) ;
}


works for me:

Code: Select all

gordon @ pi0: cc -o x x.c
gordon @ pi0: ./x
09:17:26 11-Jul-2012


-Gordon

Sheesh, a million lines of C under my belt (albeit 10 years ago+) and I make a newbie error like that Gordon.

Still I'm man enough to own up to that newbie error.

Next time, more thought before posting


Thanks all,
Paul.

Sheesh, a million lines of C under my belt (albeit 10 years ago+) and I make a newbie error like that Gordon.

Still I'm man enough to own up to that newbie error.

Next time, more thought before posting


Thanks all,
Paul.

Ah well - things that trip me up in that vein is trying to do

timeinfo = localtime(time (NULL)) ;

Glad your going now though!

-Gordon