<input style=" width:200px; height:27px;
        position:absolute; left:50%;top:15%;z-index:2; margin-left:-130px; " id="monthToday" name="dateList" type="month">
                <script>
                    document.getElementById('monthToday').valueAsDate = new Date();
                </script>
                <input style="margin:auto; width:40px; height:30px;
        position:absolute; left:50%;top:15%;z-index:2; margin-left:90px; " type="submit" value="ok">

<?php

    if(isset($_POST['dateList'])){
        $inp_inf = $_POST['dateList'];

    }else{
        $inp_inf = date('Y-m-d');
    }


    $date = new DateTime($inp_inf);
    $car_year  = $date->format('Y') ; // 2018
    $car_month = $date->format('m') ;   // 1-12   текущий месяц

    $allcells = "<tr><td style='margin:auto;height:50px; font-weight:bold' colspan='32'align='center'>ДАТА ТАБЛИЦЫ $inp_inf </td></tr>";
    $tablheader = "$allcells<tr><td style='width:200px;font-weight:bold; vertical-align: top'>Имя</td>"; // построение таблицы

    $i = 0;
    $w = "-" ;
    $day_w = 0 ;

    while($i++ < $date->format('t')) {


            $car_data = $car_year."-".$car_month."-".$i." 01:01:01" ;
            $tmp_data = strtotime($car_data);
            $day_w = date("N",$tmp_data);

            if($day_w==1) {$w = "Пн" ;}
            if($day_w==2) {$w = "Вт" ;}
            if($day_w==3) {$w = "Ср" ;}
            if($day_w==4) {$w = "Чт" ;}
            if($day_w==5) {$w = "Пт" ;}
            if($day_w==6) {$w = "Сб" ;}
            if($day_w==7) {$w = "Вс" ;}




            $tablheader = $tablheader."<td style='width:200px; vertical-align: top'>".$i." / ".$w."</td>" ;

    }

    // ЗАПИСЬ В ДВУХМЕРНОМ МАССИВЕ НАЧАЛО----------------------------------------------------------------------------------------------------------------------------

    $row = 3;// количество строк
    $col = $i + 1;// кол. столбиков
    $n [0] = "Андрей";
    $n [1] = "Олег";
    $n [2] = "Володя";
    $n [3] = "Дима";




    $tablheader = $tablheader."</tr>";
    echo $tablheader;

    ?>