function pay_report_calback()
{
    $search_criteria = array('status' => 'active');
    $sdate = '';
    $edate = '';
    if (isset($_POST['start_date'])) {
        $sdate = $_POST['start_date'];
        $search_criteria['start_date'] = wsi_get_gmt_date($sdate . ' 00:00:00');
    }
    if (isset($_POST['end_date'])) {
        $edate = $_POST['end_date'];
        $search_criteria['end_date'] = wsi_get_gmt_date($edate . ' 23:59:59');
    }
    ?>
    <h1>Payment Report</h1>
    <form method="post" style="margin: 5%">
    <table>
        <tr>
            <td>
                <input type="text" placeholder="start date (YYYY-mm-dd)" name="start_date" value="<?php 
    echo $sdate;
    ?>
">
            </td>
            <td>
                <input type="text" placeholder="End date (YYYY-mm-dd)" name="end_date" value="<?php 
    echo $edate;
    ?>
">
            </td>
            <td>
                <input type="submit" value="search" name="search">
            </td>
        </tr>
    </table>
    </form>
    <table border="solid 1px black" style="width: 75%; margin: 5%">
        <tr style="background: silver;color: black">
            <td>Student#</td>
            <td>Student Name</td>
            <td>Amount</td>
            <td>Transaction ID</td>
            <td>Campus</td>
            <td>Date</td>
        </tr>
        <?php 
    global $wpdb;
    date_default_timezone_set('America/New_York');
    $lead_table_name = $wpdb->prefix . "rg_lead";
    $lead_detail_table_name = $wpdb->prefix . "rg_lead_detail";
    $form_id = 19;
    // fetch all the entries for current day from 12:00 am to 11:59pm
    $entries = GFFormsModel::search_leads($form_id, $search_criteria);
    if (!empty($entries)) {
        foreach ($entries as $en) {
            ?>
        <tr>
            <td><?php 
            echo $en[27];
            ?>
</td>
            <td><?php 
            echo $en[14];
            ?>
</td>
            <td><?php 
            echo $en['payment_amount'];
            ?>
</td>
            <td><?php 
            echo $en['transaction_id'];
            ?>
</td>
            <td><?php 
            $campus = explode("|", $en[17]);
            echo $campus[0];
            ?>
</td>
            <td><?php 
            echo wsi_format_date($en['date_created'], TRUE, 'Y-m-d h:i A');
            ?>
</td>
        </tr>
           <?php 
        }
    } else {
        echo '<tr><td colspan="6" align="center">Sorry No matching entry found!!</td></tr>';
    }
    ?>
    </table>
 <?php 
}
<?php

/* 
 * Create entry object and fetch entries 
 */
$search_criteria = array('start_date' => wsi_get_gmt_date($sdate), 'end_date' => wsi_get_gmt_date($edate), 'status' => 'active');
// fetch all the entries for current day from 12:00 am to 11:59pm
$entries = GFFormsModel::search_leads($form_id, $search_criteria);
// fucntion handles time conversion of UTC to UTC-4 (which is set from setting general)
function wsi_format_date($gmt_datetime, $is_human = true, $date_format = "Y-m-d H:i:s", $include_time = FALSE)
{
    if (empty($gmt_datetime)) {
        return "";
    }
    //adjusting date to local configured Time Zone
    $lead_gmt_time = mysql2date("G", $gmt_datetime);
    $lead_local_time = $lead_gmt_time + get_option('gmt_offset') * 3600;
    if (empty($date_format)) {
        $date_format = get_option('date_format');
    }
    $time_diff = time() - $lead_gmt_time;
    $date_display = $include_time ? sprintf(__('%1$s at %2$s', 'gravityforms'), date_i18n($date_format, $lead_local_time, true), date_i18n(get_option('time_format'), $lead_local_time, true)) : date_i18n($date_format, $lead_local_time, true);
    return $date_display;
}
function wsi_get_gmt_date($local_date)
{
    $local_timestamp = strtotime($local_date);
    $gmt_timestamp = $local_timestamp - get_option('gmt_offset') * 3600;
    $date = gmdate("Y-m-d H:i:s", $gmt_timestamp);
    return $date;
}