Calculate the current date. Post: 302570456

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Top Forums Programming Calculate the current date. Post 302570456 by jim mcnamara on Thursday 3rd of November 2011 10:46:40 AM

11-03-2011

Registered User

This looked interesting, if a bit like homework. Tinker with this:

Code:

//Give your an integer (e.g. 0x0076f676) representing the number of minutes elapsed since January 1, 1996. 
//How to calculate the current date which format should be "year-month-day-hour-minutes" ?
// jan1.c
// usage:  ./jan1 0x0012345

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

time_t jan_1_1996(void)  // create artificial epoch seconds 
{
    struct tm j;
    j.tm_year= 1996 - 1900;
    j.tm_mon= 0;
    j.tm_mday=1;
    j.tm_hour=0;
    j.tm_min= 0;
    j.tm_sec= 0;
    j.tm_isdst=0;
    return (time_t)mktime(&j);
}

time_t
hex2dec(const char *hex)
{
    const char *p=hex;
    if(memcmp(p, "0x", 2)== 0) 
       p+=2;
    return (time_t) strtol(hex, (char **)0, 16);
}

void
get_date(const char *hex)
{
    time_t elapsed= jan_1_1996();
    char tmp[80]={0x0};
    elapsed+=( 60 * hex2dec(hex));
    strftime(tmp,80, "%Y-%m-%d-%H-%M", localtime(&elapsed) );
    printf("Corrected date is for %s: %s\n", hex, tmp);
}

int main(int argc, char **argv)
{
    if(argc==2)
      get_date(argv[1]);
    return 0;  
}

There is NO error checking in this code at all. Not meant for production systems.

jim mcnamara

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LEARN ABOUT DEBIAN

hylafax-shutdown

HYLAFAX-SHUTDOWN(5)						File Formats Manual					       HYLAFAX-SHUTDOWN(5)

NAME

       etc/shutdown - server shutdown control file

DESCRIPTION

       If the file etc/shutdown is present it describes when a HylaFAX server is to be shutdown and may contain a descriptive message to return to
       clients explaining the reason for the shutdown.	This file is used by the hfaxd(8) program.

       The file has the following format:

	      <year> <month> <day> <hour> <minute> <deny> <disconnect>
	      <shutdown message text>

       The first line defines the date and time the server should be shutdown and the time preceding  at  which  unprivileged  clients	should	be
       denied  service or disconnected; these fields are described in more detail below.  Any lines that follow the first are taken as the text of
       a message to return to clients when notifying them of a scheduled shutdown or when denying them service.

       <year>	 The decimal year; e.g. 1996.

       <month>	 The decimal month; e.g. 10 for October.

       <day>	 The decimal day of the month in the range [1..31].

       <hour>	 The decimal hour since midnight; in the range [0..23].

       <minute>  The decimal minute after the hour; in the range [0..59].

       <deny>	 The time prior to the shutdown time at which to deny service to unprivileged clients.	This value is specified as decimal  number
		 in the form HHMM; e.g.  130 for 1 hour and 30 minutes.

       <disconnect>
		 Time time prior to the shutdown time at which to disconnect unprivileged clients that are logged in to the server.  This value is
		 specified as a decimal number in the form HHMM.

NOTES

       This file is typically created using the ``SHUT'' command supported by hfaxd(8).

SEE ALSO

       hfaxd(8), hylafax-server(5)

								 January 18, 1996					       HYLAFAX-SHUTDOWN(5)