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Avoid output of duedate Dec. 31st 1969.

    1: package Apache::outputtags; 
    2: 
    3: use strict;
    4: use Apache::lonnet;
    5: use POSIX qw(strftime);
    6: 
    7: sub BEGIN {
    8:   &Apache::lonxml::register('Apache::outputtags',('displayduedate','displaytitle'));
    9: }
   10: 
   11: sub start_displayduedate {
   12:   my ($target,$token,$parstack,$parser,$safeeval)=@_;
   13:   my $result;
   14:   my $status=$Apache::inputtags::status['-1'];
   15:   &Apache::lonxml::debug("got a $status in duedatebox");
   16:   if (($status =~ /CAN.*_ANSWER/) && ($target eq 'web')) {
   17:     my $args ='';
   18:     if ( $#$parstack > -1 ) { $args=$$parstack[$#$parstack]; }
   19:     my $format = &Apache::run::run("{$args;".'return $format}',$safeeval);
   20:     if ($format eq '') {
   21:       &Apache::lonxml::debug("using default format");
   22:       $format="%c";
   23:     }
   24:     my $id = $Apache::inputtags::part;
   25:     my $date = &Apache::lonnet::EXT("resource.$id.duedate");
   26:     &Apache::lonxml::debug("duedatebox found $date for $id");
   27:     if ($date) {
   28:        $result ='<table border="on"><tr><td>Due at '.
   29:          POSIX::strftime($format,localtime($date)).
   30: 	   '</td></tr></table>';
   31:     } else {
   32:       $result ='<table border="on"><tr><td>No due date set.</td></tr></table>';
   33:     }
   34:   }
   35:   return $result;
   36: }
   37: 
   38: sub end_displayduedate {
   39: }
   40: 
   41: sub start_displaytitle {
   42:   my ($target,$token,$parstack,$parser,$safeeval)=@_;
   43:   my $result='';
   44:   if ($target eq 'web') {
   45:     $result="<h1>$Apache::lonhomework::name</h1>";
   46:   }
   47:   return $result;
   48: }
   49: 
   50: sub end_displaytitle {
   51: }
   52: 
   53: 1;
   54: __END__