I am displaying a long list of sales details from a table in mysql.
The problem is I am being able to fetch data only for a month. As soon as the month changes it doesnt display anything.
For ex: data being displayed from 1/05/2015 to 30/05/2015 but from 1/06/2015 it does not display anything.

I add the timestamp values on each sale in the database using the following code:

```
$time = round(microtime(true)*1000);

```

Rest of the code is here:

```
<?php
include 'connect.php';
$timestamp = "";
$return = array();
$response = "";
$sql = "SELECT * FROM receipts ORDER BY timestamp DESC LIMIT 1";
$result1 = mysqli_query($db, $sql);
if($details = mysqli_fetch_array($result1)){
    $timestamp = $details['timestamp'];
}

$sql = "SELECT * FROM sales WHERE timestamp>'$timestamp' ORDER BY date ASC";
$result = mysqli_query($db, $sql);

echo "<table class=table1>";
while($fetch_options=mysqli_fetch_array($result)){
    $memo=$fetch_options['memo'];
    $product=$fetch_options['pid'];
    $qty=$fetch_options['qty'];
    $amount=$fetch_options['amt'];

    echo "<tr>";
    echo "<td align=center>$memo</td>
             <td align=center>$product</td>
             <td align=center>$qty</td>
             <td align=center>$amount</td>";
    echo "</tr>";
}
echo "</table>";
?>

```

I feel this problem is something to do with the timestamp values.
Thanks in advance.