Track code on reset base on day,week,month - php

Question

I am trying to create a tracker code, which is when a user enter my page, I will record and add the visitor view by 1
The problem with my code is on every monday, it not only reset the week stats, it also reset the month stats, I paste my increment code and reset code in php below.
Thanks for helping me, I try to figure it out for a few days but can't spot where I code wrongly.
This is my ads.php which I run it by do
<img src="ads.php" width="1" height="1">
at every page
This is my ads.php code
include 'conn.php';
$postID = $_GET['pid'];
$todayDate = date("m-d-y");
//Query with postDate
$sql = "SELECT * FROM wp_tracker WHERE postID LIKE '" . $postID . "'";
$result = mysql_query($sql);
$exist = 0;
while ($row = mysql_fetch_array($result)) {
$postDate = $row['postDate'];
$dayView = $row['dayView'];
$weekView = $row['weekView'];
$monthlyView = $row['monthlyView'];
$exist++;
}
if ($exist == 0) {
//create new record
$sql = "INSERT INTO wp_tracker (postID, postDate) VALUES ('$postID ','$todayDate')";
if (!mysql_query($sql, $con)) {
die('Error: ' . mysql_error());
}
}
if ($exist > 0) {
//if record exist
//check if it same day
if ($postDate == $todayDate) {
//if same day - just increment views
$dayView = $dayView + 1;
$weekView = $weekView + 1;
$monthlyView = $monthlyView + 1;
$sql2 = "UPDATE wp_tracker SET dayView = '$dayView',weekView = '$weekView',monthlyView = '$monthlyView' WHERE postID='$postID '";
$result2 = mysql_query($sql2);
}
}//end if exist
Below is my reset code (reset.php)
$todayDate = date("m-d-y");
//Query with postDate
$sql = "SELECT postDate FROM wp_tracker order by postDate ASC";
$result = mysql_query($sql);
$row = mysql_fetch_row($result);
$postDate = $row[0];
$timestamp = time();
if ($postDate != $todayDate) {
//a new day -- update dayView to 0
$dayView = 1;
$sql3 = "UPDATE wp_tracker SET postDate= '" . $todayDate . "', dayView = '$dayView'";
$result3 = mysql_query($sql3);
}
if (date('D', $timestamp) === 'Mon') {
$weekView = 1;
$sql3 = "UPDATE wp_tracker SET weekView = '$weekView'";
$result3 = mysql_query($sql3);
}
if (date('d', $timestamp) === '01') {
$monthlyView = 1;
$sql3 = "UPDATE wp_tracker SET monthlyView= '$monthlyView'";
$result3 = mysql_query($sql3);
}