C:/xampp/htdocs/moodle/user/filters/date.php

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<?php

require_once($CFG->dirroot.'/user/filters/lib.php');

class user_filter_date extends user_filter_type {
    var $_field;

    function user_filter_date($name, $label, $advanced, $field) {
        parent::user_filter_type($name, $label, $advanced);
        $this->_field = $field;
    }

    function setupForm(&$mform) {
        $objs = array();

        $objs[] =& $mform->createElement('checkbox', $this->_name.'_sck', null, get_string('isafter', 'filters'));
        $objs[] =& $mform->createElement('date_selector', $this->_name.'_sdt', null);
        $objs[] =& $mform->createElement('static', $this->_name.'_break', null, '<br/>');
        $objs[] =& $mform->createElement('checkbox', $this->_name.'_eck', null, get_string('isbefore', 'filters'));
        $objs[] =& $mform->createElement('date_selector', $this->_name.'_edt', null);

        $grp =& $mform->addElement('group', $this->_name.'_grp', $this->_label, $objs, '', false);

        if ($this->_advanced) {
            $mform->setAdvanced($this->_name.'_grp');
        }

        $mform->disabledIf($this->_name.'_sdt[day]', $this->_name.'_sck', 'notchecked');
        $mform->disabledIf($this->_name.'_sdt[month]', $this->_name.'_sck', 'notchecked');
        $mform->disabledIf($this->_name.'_sdt[year]', $this->_name.'_sck', 'notchecked');
        $mform->disabledIf($this->_name.'_edt[day]', $this->_name.'_eck', 'notchecked');
        $mform->disabledIf($this->_name.'_edt[month]', $this->_name.'_eck', 'notchecked');
        $mform->disabledIf($this->_name.'_edt[year]', $this->_name.'_eck', 'notchecked');
    }

    function check_data($formdata) {
        $sck = $this->_name.'_sck';
        $sdt = $this->_name.'_sdt';
        $eck = $this->_name.'_eck';
        $edt = $this->_name.'_edt';

        if (!array_key_exists($sck, $formdata) and !array_key_exists($eck, $formdata)) {
            return false;
        }

        $data = array();
        if (array_key_exists($sck, $formdata)) {
            $data['after'] = $formdata->$sdt;
        } else {
            $data['after'] = 0;
        }
        if (array_key_exists($eck, $formdata)) {
            $data['before'] = $formdata->$edt;
        } else {
            $data['before'] = 0;
        }

        return $data;
    }

    function get_sql_filter($data) {
        $after  = (int)$data['after'];
        $before = (int)$data['before'];

        $field  = $this->_field;

        if (empty($after) and empty($before)) {
            return array('', array());
        }

        $res = " $field >= 0 " ;

        if ($after) {
            $res .= " AND $field >= $after";
        }

        if ($before) {
            $res .= " AND $field <= $before";
        }
        return array($res, array());
    }

    function get_label($data) {
        $after  = $data['after'];
        $before = $data['before'];
        $field  = $this->_field;

        $a = new stdClass();
        $a->label  = $this->_label;
        $a->after  = userdate($after);
        $a->before = userdate($before);

        if ($after and $before) {
            return get_string('datelabelisbetween', 'filters', $a);
        } else if ($after) {
            return get_string('datelabelisafter', 'filters', $a);
        } else if ($before) {
            return get_string('datelabelisbefore', 'filters', $a);
        }
        return '';
    }
}