<?php
if ($vbulletin->GPC['searchbyyear'] >= 2000 and $vbulletin->GPC['searchbyyear'] <= date('Y')) {
    $start_year_unixtime = mktime(0, 0, 0, 1, 1, $vbulletin->GPC['searchbyyear']);
    $end_year_unixtime = mktime(23, 59, 59, 12, 31, $vbulletin->GPC['searchbyyear']);
    $post_query_logic[100] = "post.dateline >= " . $start_year_unixtime . " AND post.dateline <= " .
    $end_year_unixtime;
}

// Does not work as planned so just removed limit for mods in code frag in block below
1401 if(can_moderate() AND $vbulletin->GPC['searchbyyear'] >= 2000 AND $vbulletin->GPC['searchbyyear'] <= date("Y"))
1402 {                                  
1403     $nl_query_limit = 'LIMIT  3000';
1404     $vbulletin->options['maxresults'] = 3000;
1405 }
1406 else
1407 {                                  
1408     $nl_query_limit = 'LIMIT ' . $vbulletin->options['maxresults'];
1409 }
// Does not work as planned so just removed limit for mods in code frag in block below

2655 // trim results down to maximum $vbulletin->options[maxresults]
2656 if ($vbulletin->options['maxresults'] > 0 AND $numitems > $vbulletin->options['maxresults'] AND !can_moderate())
2657 {
2658   $clippedids = array();
2659   for ($i = 0; $i < $vbulletin->options['maxresults']; $i++)
2660   {
2661     $clippedids[] = $orderedids["$i"];
2662   }
2663   $orderedids =& $clippedids;
2664   $numitems = $vbulletin->options['maxresults'];
2665 }

search_forums

<div  style="margin:20px 0px 10px 0px;font-weight:bold;cursor:pointer;" ><span>Search by Year:</span><span style="cursor:pointer;margin-left:20px;color:indigo;" class="neo-toolbit" title="User Name Searches by Year in Posts Only. Please Search By User Name and Select Show Results by Posts (Below, Left)"><i class="fas fa-question-circle"></i></span></div>
<div style="padding:$stylevar[formspacer]px">
    <div style="margin:0px 0px 10px 0px;display:none;">:</div>
    <div id="by_year">
        <input type="text" class="bginput form-control" name="searchbyyear" id="by_year_input" size="100"  placeholder="Year in 20YY Format for User Name Searches in Posts"/>
    </div>
</div>