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#!/usr/bin/perl --
# I hereby place this in the public domain - Ian Jackson, 1995.
# Changes by Klee Dienes also placed in public domain (1997).
# time structure:
# [ sec min hour mday mon year wday yday isdst ]
@ARGV && die "usage: 822-date\n";
$curtime = time;
@localtm = localtime ($curtime);
$localtms = localtime ($curtime);
@gmttm = gmtime ($curtime);
$gmttms = gmtime ($curtime);
if ($localtm[0] != $gmttm[0]) {
die (sprintf ("local timezone differs from GMT by a non-minute interval\n"
. "local time: %s\n"
. "GMT time: %s\n", $localtms, $gmttms));
}
$localmin = $localtm[1] + $localtm[2] * 60;
$gmtmin = $gmttm[1] + $gmttm[2] * 60;
if ((($gmttm[6] + 1) % 7) == $localtm[6]) {
$localmin += 1440;
} elsif ((($gmttm[6] - 1) % 7) == $localtm[6]) {
$localmin -= 1440;
} elsif ($gmttm[6] == $localtm[6]) {
1;
} else {
die ("822-date: local time offset greater than or equal to 24 hours\n");
}
$offset = $localmin - $gmtmin;
$offhour = $offset / 60;
$offmin = abs ($offset % 60);
if (abs ($offhour) >= 24) {
die ("822-date: local time offset greater than or equal to 24 hours\n");
}
printf
(
"%s, %2d %s %d %02d:%02d:%02d %s%02d%02d\n",
(Sun,Mon,Tue,Wed,Thu,Fri,Sat)[$localtm[6]], # day of week
$localtm[3], # day of month
(Jan,Feb,Mar,Apr,May,Jun,Jul,Aug,Sep,Oct,Nov,Dec)[$localtm[4]], # month
$localtm[5]+1900, # year
$localtm[2], # hour
$localtm[1], # minute
$localtm[0], # sec
($offset >= 0) ? '+' : '-',# TZ offset direction
abs ($offhour), # TZ offset hour
$offmin, # TZ offset minute
) || die "822-date: output error: $!\n";
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