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Full Discussion: time access in C
Top Forums Programming time access in C Post 302439249 by xyzt on Thursday 22nd of July 2010 07:01:39 AM
Old 07-22-2010
time access in C

I've a problem with time functions in C. I get current time and convert it to local time and gmt time. But their value seems to be same.I think I'm missing something..

Code:
#include <stdio.h>
#include <memory.h>
#include <time.h>

int main()
{
        time_t now_local, now_gmt;
        now_local = time(NULL);
        const char* local_now_str = ctime(&now_local);
        printf("local time: %s\n", local_now_str);

        now_gmt = time(NULL);
        const char* gmt_now_str = asctime( gmtime( &now_gmt ) );
        printf("gmt time  : %s\n", gmt_now_str);

        printf("diff      : %d\n", (int)(now_local-now_gmt));
}

Output:

local time: Thu Jul 22 13:53:05 2010

gmt time : Thu Jul 22 10:53:05 2010

diff : 0

Last edited by xyzt; 07-22-2010 at 08:09 AM..
 

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sttime(3)						    ShapeTools Toolkit Library							 sttime(3)

NAME
stMktime, stWriteTime - date and time handling SYNOPSIS
#include <config.h> #include <sttk.h.h> time_tstMktime (char *string); char*stWriteTime (time_t date); DESCRIPTION
stMktime scans the given string and tries to read a date and time from it. It understands various formats of date strings. The following is a list of all valid formats, optional parts in brackets. [Tue] Jan 5[,] [19]93 This includes the standard asctime(3) format. Jan 5 With no year given, the year defaults to the current year. [19]93/01/05 This notation requires month and day represented by exactly two digits. 5.1.[19]93 This is the usual German notation. 5.1. German notation referencing the current year. A certain time, given together with the date must always have the following form. hours:minutes[:seconds] Each of the fields must be an integer value within the proper range (hours: 0-23, minutes and seconds: 0-59). Values below 10 may be written as one digit numbers. The time value may be placed anywhere in the date string: at the beginning, at the end, or somewhere in the middle. Any amount of white- space may be given between a field of the time value and the separating colon. The time is always considered to be local time. stWriteTime generates a time string similar to asctime(3) from its date argument. SEE ALSO
asctime(3) BUGS
Time Zone Names within the time string (like `MET') are not handled properly. In most cases they will cause a failure. sttk-1.7 Thu Jun 24 17:43:35 1993 sttime(3)
All times are GMT -4. The time now is 11:13 AM.
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