Date: Tue, 10 Aug 2004 20:11:19 +0300 From: Giorgos Keramidas <keramida@ceid.upatras.gr> To: Mipam <mipam@ibb.net> Cc: freebsd-questions@freebsd.org Subject: Re: localtime question Message-ID: <20040810171119.GA26303@orion.daedalusnetworks.priv> In-Reply-To: <Pine.BSO.4.56.0408101842210.21307@ux11.ltcm.net> References: <Pine.BSO.4.56.0408101646230.26666@ux11.ltcm.net> <20040810162612.GC25389@orion.daedalusnetworks.priv> <Pine.BSO.4.56.0408101842210.21307@ux11.ltcm.net>
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On 2004-08-10 18:45, Mipam <mipam@ibb.net> wrote:
> > Try calling ctime() with the address of tv.tv_sec:
> >
> > printf("%s\n", ctime(&tv.tv_sec));
>
> #include <stdio.h>
> #include <sys/time.h>
>
> int main(void)
> {
> struct timeval tv;
> struct timeval tv_current;
> if (gettimeofday(&tv_current, NULL) == -1)
> err(1, "Could not get local time of day");
> tv.tv_sec = tv_current.tv_sec-86400;
> printf("%s\n", ctime(&tv.tv_sec));
> return 0;
> }
>
> Does the job, thanks!
> At compile time i get:
>
> tijd.c: In function `main':
> tijd.c:11: warning: passing arg 1 of `ctime' from incompatible pointer type
That's because struct timeval's members are `long' not time_t.
printf("%s\n", ctime((const time_t *) &tv.tv_sec));
Add <err.h> to your includes too and sort them in this order:
#include <sys/time.h>
#include <err.h>
#include <stdio.h>
System headers first, the rest afterwards; each list sorted
alphabetically unless there is a good reason to do otherwise.
This becomes handy when there are long lists of headers as it's easy to
spot and fix duplicate includes :-)
> Only thing left is another format like: 2004 Aug 9 18:44:04
> Any hints?
You'd have to use strftime() and a local buffer for that.
Cheers
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