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#include <stdio.h>
#include <time.h>
static char *wdays[]={"Sun","Mon","Tue","Wed","Thu","Fri","Sat"};
static char *months[]={"Jan","Feb","Mar","Apr","May","Jun",
"Jul","Aug","Sep","Oct","Nov","Dec"};
char *gmtoffset(time_t);
char *rfcdate(now)
time_t now;
{
static char buf[40];
struct tm ptm;
if (!now) time(&now);
ptm=*localtime(&now);
sprintf(buf,"%s, %02d %s %d %02d:%02d:%02d %s",
wdays[ptm.tm_wday],ptm.tm_mday,months[ptm.tm_mon],
1900+ptm.tm_year,ptm.tm_hour,ptm.tm_min,ptm.tm_sec,
gmtoffset(now));
return(buf);
}
char *gmtoffset(now)
time_t now;
{
static char buf[6]="+0000";
struct tm ptm;
#if defined(DONT_HAVE_TM_GMTOFF)
struct tm gtm;
#endif
char sign;
int hr,min;
long offset;
if (!now) time(&now);
ptm=*localtime(&now);
#if defined(DONT_HAVE_TM_GMTOFF)
/* To get the timezone, compare localtime with GMT. */
gtm=*gmtime(&now);
/* Assume we are never more than 24 hours away. */
offset = gtm.tm_yday - ptm.tm_yday;
if (offset > 1)
offset = -24;
else if (offset < -1)
offset = 24;
else
offset *= 24;
/* Scale in the hours and minutes; ignore seconds. */
offset += gtm.tm_hour - ptm.tm_hour;
offset *= 60;
offset += gtm.tm_min - ptm.tm_min;
#else
offset=-ptm.tm_gmtoff/60L;
#endif
if (offset <= 0)
{
sign='+';
offset=-offset;
}
else sign='-';
hr=offset/60L;
min=offset%60L;
sprintf(buf,"%c%02d%02d",sign,hr,min);
return(buf);
}
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