--- loncom/homework/default_homework.lcpm	2008/05/30 01:16:04	1.134
+++ loncom/homework/default_homework.lcpm	2008/09/06 21:39:15	1.138
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA 
 # used by lonxml::xmlparse() as input variable $safeinit to Apache::run::run()
 #
-# $Id: default_homework.lcpm,v 1.134 2008/05/30 01:16:04 www Exp $
+# $Id: default_homework.lcpm,v 1.138 2008/09/06 21:39:15 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -316,7 +316,9 @@ sub caparesponse_check_list {
     $unit=~s/\s//;
     foreach my $response (@$responses) {
        foreach my $element (@$response) {	
-          $element =~ s/\s//g;
+          if (($type eq 'float') || (($type eq '') && ($unit ne ''))) {
+              $element =~ s/\s//g;
+          }
           my $appendunit=$unit;
           if ($unit=~/\%/) {
              $element=$element/100;
@@ -424,10 +426,12 @@ sub caparesponse_check_list {
 }
 
 sub cas {
-    my ($system,$input)=@_;
+    my ($system,$input,$library)=@_;
     my $output;
     if ($system eq 'maxima') {
-       $output=&maxima_eval($input);
+       $output=&maxima_eval($input,$library);
+    } else {
+       $output='Error: unrecognized CAS';
     }
     return $output;
 }
@@ -1024,46 +1028,57 @@ sub sec {
     return $sec;
 }
 
+sub submission {
+   my ($partid,$responseid,$subnumber)=@_;
+   my $sub='';
+   if ($subnumber) { $sub=$subnumber.':'; }
+   return &EXT('user.resource.'.$sub.'resource.'.$partid.'.'.$responseid.'.submission');
+}
+
+sub currentpart {
+   return $external::part;
+}
+
+sub eval_time {
+   my ($timestamp)=@_;
+   unless ($timestamp) { return ''; }
+   return &locallocaltime($timestamp);
+}
+
 sub open_date { 
     my ($partid)=@_;
     unless ($partid) { $partid=0; }
-    my @dc = split(/\s+/,localtime(&EXT('resource.'.$partid.'.opendate')));
-    return '' if ($dc[0] eq "Wed" and $dc[2] == 31 and $dc[4] == 1969);
-    my @hm = split(/:/,$dc[3]);
-    my $ampm = " am";
-    if ($hm[0] > 12) {
-	$hm[0]-=12;
-	$ampm = " pm";
-    }
-    return $dc[0].', '.$dc[1].' '.$dc[2].', '.$dc[4].' at '.$hm[0].':'.$hm[1].$ampm;
+    return &eval_time(&EXT('resource.'.$partid.'.opendate'));
 }
 
 sub due_date {
     my ($partid)=@_;
     unless ($partid) { $partid=0; } 
-    my @dc = split(/\s+/,localtime(&EXT('resource.'.$partid.'.duedate')));
-    return '' if ($dc[0] eq "Wed" and $dc[2] == 31 and $dc[4] == 1969);
-    my @hm = split(/:/,$dc[3]);
-    my $ampm = " am";
-    if ($hm[0] > 12) {
-	$hm[0]-=12;
-	$ampm = " pm";
-    }
-    return $dc[0].', '.$dc[1].' '.$dc[2].', '.$dc[4].' at '.$hm[0].':'.$hm[1].$ampm;
+    return &eval_time(&EXT('resource.'.$partid.'.duedate'));
 }
 
 sub answer_date { 
     my ($partid)=@_;
     unless ($partid) { $partid=0; }
-    my @dc = split(/\s+/,localtime(&EXT('resource.'.$partid.'.answerdate')));
-    return '' if ($dc[0] eq "Wed" and $dc[2] == 31 and $dc[4] == 1969);
-    my @hm = split(/:/,$dc[3]);
-    my $ampm = " am";
-    if ($hm[0] > 12) {
-	$hm[0]-=12;
-	$ampm = " pm";
-    }
-    return $dc[0].', '.$dc[1].' '.$dc[2].', '.$dc[4].' at '.$hm[0].':'.$hm[1].$ampm;
+    return &eval_time(&EXT('resource.'.$partid.'.answerdate'));
+}
+
+sub open_date_epoch {
+    my ($partid)=@_;
+    unless ($partid) { $partid=0; }
+    return &EXT('resource.'.$partid.'.opendate');
+}
+
+sub due_date_epoch {
+    my ($partid)=@_;
+    unless ($partid) { $partid=0; }
+    return &EXT('resource.'.$partid.'.duedate');
+}
+
+sub answer_date_epoch {
+    my ($partid)=@_;
+    unless ($partid) { $partid=0; }
+    return &EXT('resource.'.$partid.'.answerdate');
 }
 
 sub array_moments {