topic Re: Getting date and time from from time.h in Operating System - Linux

Getting date and time from from time.h

CA1490051 — Wed, 12 Dec 2007 06:50:10 GMT

Hi All,

I want to get the system date and time i am tryong man pages of local time

Here is my code
#include
int main()
{
tm TimeNow;
char *pTime = localtime(&TimeNow);

printf("%s",*pTime);
return 0;;

}

It says " tm undefined "

Can anyone help me in getting through this problem.

thanks and regards
Vikram

Re: Getting date and time from from time.h

Torsten. — Wed, 12 Dec 2007 07:20:41 GMT

I did no programming for at least 10 years now, but I guess it must be something like

struct tm *TimeNow;
time_t Now;

...

Now = time ( NULL );
TimeNow = localtime ( &Now );

printf ( "%s", ctime ( &Now ) );

Re: Getting date and time from from time.h

Kapil Jha — Wed, 12 Dec 2007 07:42:05 GMT

Yes it should be struct tm.
You have to define TimeNow as smthing.
There is nothin like tm.

BR,
KApil

Re: Getting date and time from from time.h

Dennis Handly — Wed, 12 Dec 2007 08:22:13 GMT

You can also do:
#include
#include
int main() {
struct tm *TimeNow;
time_t now = time(NULL);
TimeNow = localtime(&now);
printf("%s", asctime(TimeNow));
return 0;
}

Re: Getting date and time from from time.h

Dennis Handly — Wed, 12 Dec 2007 10:04:18 GMT

>KApil: There is nothin like tm.

In a real language like C++ there is. :-)
struct tm == tm

Re: Getting date and time from from time.h

Torsten. — Wed, 12 Dec 2007 10:12:43 GMT

Real language?
;-)

Anyway, looks like "pure" C.

Here is the struct

struct tm {
int tm_sec; /* second (0-61, allows for leap seconds) */
int tm_min; /* minute (0-59) */
int tm_hour; /* hour (0-23) */
int tm_mday; /* day of the month (1-31) */
int tm_mon; /* month (0-11) */
int tm_year; /* years since 1900 */
int tm_wday; /* day of the week (0-6) */
int tm_yday; /* day of the year (0-365) */
int tm_isdst;/* non-0 if daylight savings time is in effect */
};

Re: Getting date and time from from time.h

CA1490051 — Thu, 13 Dec 2007 08:57:23 GMT

Hi All,

Yes, i missed struct there.

I am also able to achieve this by following 2 lines of code

#include
long t = time(0);
cout << asctime(localtime(&t))<
thanks and regards
Vikram

Re: Getting date and time from from time.h

Dennis Handly — Thu, 13 Dec 2007 10:01:26 GMT

>I am also able to achieve this by following 2 lines of code

If you are going to use iostream, you should go whole hog: :-)

#include
#include
#include
struct my_pt : public std::time_put {} tp;
struct my_ibase : public std::ios_base {};
int main() {
std::tm *TimeNow;
std::time_t now = std::time(NULL);
TimeNow = std::localtime(&now);
// printf("%s", asctime(TimeNow));
const char format[] = "%a %b %d %H:%M:%S %Y\n";
my_pt::iter_type o_itr(std::cout);
my_ibase ibase;
tp.put(o_itr, ibase, ' ', TimeNow, format, format + (sizeof(format)-1));
}

Re: Getting date and time from from time.h

CA1490051 — Thu, 13 Dec 2007 13:02:53 GMT

Hi All,

In my previous reply there is 1 wrong sorry for that
it should be as below

#include
time_t t = time(0);
cout << asctime(localtime(&t))<

thanks and regards
Vikram