Index: lib/TWiki/Search.pm
===================================================================
--- lib/TWiki/Search.pm	(revision 3776)
+++ lib/TWiki/Search.pm	(working copy)
@@ -386,6 +386,7 @@
     my $theTopic =      $params{topic} || "";
     my $theType =       $params{type} || "";
     my $theWebName =    $params{web} || "";
+    my $theDate =       $params{date} || "";
 
     ##$this->writeDebug "Search locale is $TWiki::cfg{SiteLocale}";
 
@@ -661,6 +662,18 @@
             ##$this->writeDebug "Topic list after sort = @topicList";
         }
 
+        if( $theDate ){
+            use TWiki::Time;
+            my @ends = &TWiki::Time::parseInterval($theDate);
+            my @resultList=();
+            foreach my $topic (@topicList){
+                # if date falls out of interval: exclude topic from result
+                my $topicdate = $this->store()->getTopicLatestRevTime( $web, $topic );
+                push(@resultList, $topic) unless (($topicdate<$ends[0]) || ($topicdate>$ends[1]));
+            }
+            @topicList = @resultList;   
+        }
+
         # header and footer of $web
         my( $beforeText, $repeatText, $afterText ) = split( /%REPEAT%/, $tmplTable );
         if( $theHeader ) {
Index: lib/TWiki/Time.pm
===================================================================
--- lib/TWiki/Time.pm	(revision 3776)
+++ lib/TWiki/Time.pm	(working copy)
@@ -224,4 +224,129 @@
     return sprintf("%.0f", ($nextThursday - $firstFourth) / ( 7 * 86400 )) + 1;
 }
 
+
+=pod
+
+---++ StaticMethod parseInterval( $szInterval ) -> [$iSecs, $iSecs]
+
+Convert string representing a time interval to a pair of integers
+representing the amount of seconds since epoch for the start and end
+extremes of the time interval.
+
+   * =$szInterval= - time interval string
+
+in yacc syntax, grammar and actions:
+interval ::= date                 { $$.start = fillStart($1); $$.end = fillEnd($1); }
+         | date '/' date          { $$.start = fillStart($1); $$.end = fillEnd($3); }
+         | 'P' duration '/' date  { $$.start = fillEnd($4)-$2; $$.end = fillEnd($4); }
+         | date '/' 'P' duration  { $$.start = fillStart($1); $$.end = fillStart($1)+$4; }
+         ;
+
+A TimeInterval is of the form (BNF):
+   * <Time><TimeZone>
+   * <Time>/<Time><TimeZone>
+   * <IntervalDuration>/<Time><TimeZone>
+   * <Time>/<IntervalDuration><TimeZone>
+
+<IntervalDuration> has the form (regular expression):
+   * P(<number><nameOfDuration>)+
+
+<nameOfDuration> may be one of:
+   * D(day), H(hour), M(minute), s(second), w(week), m(month)
+
+<Time> must be of any of the following formats 
+       (any amount of trailing elements may be omitted):
+   * 2001-12-31T23:59:59
+
+<TimeZone> is optional
+
+If the format is not recognised, will return empty interval [0,0].
+
+TODO: timezone
+      testing, especially on non valid strings
+
+=cut
+
+sub parseInterval{
+    my ($theInterval) = @_;
+
+    use HTTP::Date;
+    my @lt = localtime();
+    my $today = sprintf("%04d-%02d-%02d",$lt[5]+1900, $lt[4]+1, $lt[3]);
+    my $now = $today . sprintf("T%02d:%02d:02d",$lt[2], $lt[1], $lt[0]);
+
+    # replace $now and $today shortcuts
+    $theInterval =~ s/\$today/$today/g;
+    $theInterval =~ s/\$now/$now/g;
+
+    # if $theDate does not contain a '/': force it to do so.
+    $theInterval = $theInterval."/".$theInterval unless ($theInterval =~ /\// );
+
+    my @ends = split(/\//, $theInterval);
+
+    # first translate dates into seconds from epoch,
+    # in the second loop we will examine interval durations.
+
+    foreach my $i (0,1) {
+        #   if not a period of time:
+        next if ($ends[$i] =~ "^P");
+
+        #   TODO assert(must include the year)
+        if($i) {
+            # fillEnd
+            #     if ending point, complete with parts from "-12-31T23:59:60"
+            #     if completing ending point, check last day of month
+            # TODO: do we do leap years?
+            if (length($ends[$i]) == 7){
+                my $month = substr($ends[$i],5);
+                my @monthLens = (31,28,31,30,31,30,31,31,30,31,30,31);
+                $ends[$i] .= @monthLens[$month-1];
+            }
+            $ends[$i] .= substr("0000-12-31T23:59:59",length($ends[$i]));
+        } else {
+            # fillStart
+            #     if starting point, complete with parts from "-01-01T00:00:00"
+            $ends[$i] .= substr("0000-01-01T00:00:00",length($ends[$i]));
+        }
+
+        #     convert the string into integer amount of seconds
+        #     from 1970-01-01T00:00:00.00 UTC
+
+        $ends[$i] = &HTTP::Date::str2time($ends[$i]);
+    }
+
+    # now we're ready to translate interval durations...
+    # ... we don't do P<whatever/P<whatever> !!!
+
+    my @oper = ("-","+");
+    # if any extreme was a time duration, examine it
+    foreach my $i (0,1) {
+        next unless ($ends[$i] =~ /^P/);
+
+        #   drop the 'P', substitute each letter with '*<value>+',
+        #   where <value> is the amount of seconds represented by
+        #   the unit.  for example: w (week) becomes '*604800+'.
+        $ends[$i] =~ s/^P//;
+        $ends[$i] =~ s/y/\*31556925\+/gi; # tropical year
+        $ends[$i] =~ s/m/\*2592000\+/g;   # 1m = 30 days
+        $ends[$i] =~ s/w/\*604800\+/gi;   # 1w = 7 days
+        $ends[$i] =~ s/d/\*86400\+/gi;
+        $ends[$i] =~ s/h/\*3600\+/gi;
+        $ends[$i] =~ s/M/\*60\+/g;        # note: m != M
+        $ends[$i] =~ s/S/\*1\+/gi;
+        #   possibly append '0' and evaluate numerically the string.  
+        $ends[$i] =~ s/\+$/+0/;
+        my $duration = eval($ends[$i]);
+        #   the value computed, if it specifies the starting point
+        #   in time, must be subtracted from the previously
+        #   computed ending point.  if it specifies the ending
+        #   point, it must be added to the previously computed
+        #   starting point.
+        $ends[$i] = eval($ends[1-$i].$oper[$i].$ends[$i]);
+        #   in case the user specified both start and end as a
+        #   time duration, some kind of error must be reported.
+    }    
+    return @ends;
+}
+
 1;
Index: data/TWiki/TWikiVariablesNtoZ.txt
===================================================================
--- data/TWiki/TWikiVariablesNtoZ.txt	(revision 3776)
+++ data/TWiki/TWikiVariablesNtoZ.txt	(working copy)
@@ -116,6 +116,7 @@
 	  | =scope="topic"= <br /> =scope="text"= <br /> =scope="all"= | Search topic name (title); the text (body) of topic; or all (both) | ="text"= |
 	  | =order="topic"= <br /> =order="created"= <br />  =order="modified"= <br /> =order="editby"= <br /> =order=<br />&nbsp;"formfield(name)"= | Sort the results of search by the topic names, topic creation time, last modified time, last editor, or named field of TWikiForms. The sorting is done web by web; in case you want to sort across webs, create a [[FormattedSearch][formatted]] table and sort it with TablePlugin's initsort | Sort by topic name |
 	  | =limit="all"= <br /> =limit="16"= | Limit the number of results returned. This is done after sorting if =order= is specified | All results |
+	  | =date="..."= | TimeInterval: if specified, limits the results to those pages with latest edit time in the given interval.  The value received is expected to follow ISO8601.  for example, these are equivalent: =date="2003"= and =date="2003-01-01T00:00:00/2003-12-31T23:59:59"=.  | All results |
 	  | =reverse="on"= | Reverse the direction of the search | Ascending search |
 	  | =casesensitive="on"= | Case sensitive search | Ignore case |
 	  | =nosummary="on"= | Show topic title only | Show topic summary |