Make a countdown to same day each week?

Question

Hi Here is my code I'm just looking to make it count down to the same time each week example (midnight Wednesday)

function makeTimer() {

        var endTime = new Date("Dec 12, 2019 00:00:00");          
            endTime = (Date.parse(endTime) / 1000);

            var now = new Date();
            now = (Date.parse(now) / 1000);

            var timeLeft = endTime - now;

            var days = Math.floor(timeLeft / 86400); 
            var hours = Math.floor((timeLeft - (days * 86400)) / 3600);
            var minutes = Math.floor((timeLeft - (days * 86400) - (hours * 3600 )) / 60);
            var seconds = Math.floor((timeLeft - (days * 86400) - (hours * 3600) - (minutes * 60)));
  
            if (hours < "10") { hours = "0" + hours; }
            if (minutes < "10") { minutes = "0" + minutes; }
            if (seconds < "10") { seconds = "0" + seconds; }

            $(".days").html(days + "<span class='mid'>Days</span><span class='top'>d</span>");
            $(".hours").html(hours + "<span class='mid'>Hours</span><span class='top'>h</span>");
            $(".minutes").html(minutes + "<span class='mid'>Minutes</span><span class='top'>m</span>");
            $(".seconds").html(seconds + "<span class='mid'>Seconds</span><span class='top'>s</span>");       

       if (timeLeft < 0) {
        clearInterval(makeTimer);
        $(".timer").hide();;
      }

    }

    setInterval(function() { makeTimer(); }, 1000);

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div class="timer">
  <div class="days"></div>
  <div class="hours"></div>
  <div class="minutes"></div>
  <div class="seconds"></div>
</div>