Today's date on a calendar

<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">

<title>My code example</title>
<style>
:root {
  font-family: system-ui, sans-serif;
  color: #18223b;
}
* {
  box-sizing: border-box;
}
body {
  margin: 0;
  min-height: 100vh;
  padding: 24px;
  background: #edf1ff;
  display: grid;
  place-items: center;
}
main {
  width: min(100%, 480px);
  background: white;
  border-radius: 20px;
  padding: 24px;
}
h1 {
  font-size: 24px;
  margin: 0 0 16px;
}
button,
input {
  font: inherit;
}
button {
  min-height: 44px;
  border: 1px solid #afbddd;
  border-radius: 10px;
  padding: 10px 14px;
  background: #eff3ff;
  color: #18223b;
  cursor: pointer;
}
button:focus-visible,
input:focus-visible {
  outline: 3px solid #3658bf;
  outline-offset: 3px;
}
p {
  line-height: 1.65;
}
button:disabled {
  opacity: 0.5;
  cursor: default;
}
table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 4px;
  text-align: center;
}
caption {
  font-weight: 700;
  margin-bottom: 16px;
}
th,
td {
  height: 38px;
}
th {
  font-size: 12px;
  color: #58647b;
}
td {
  border-radius: 8px;
  background: #f5f7fe;
}
td:empty {
  background: transparent;
}
[aria-current="date"] {
  background: #3658bf;
  color: white;
  font-weight: 700;
}
time {
  display: block;
  padding: 6px;
}
</style>
</head>
<body>
<main
  ><h1>Your month at a glance</h1
  ><table
    ><caption id="month">Current month</caption
    ><thead
      ><tr
        ><th scope="col">Sun</th><th scope="col">Mon</th><th scope="col">Tue</th
        ><th scope="col">Wed</th><th scope="col">Thu</th><th scope="col">Fri</th
        ><th scope="col">Sat</th></tr
      ></thead
    ><tbody id="calendar"></tbody></table
  ><p id="today"></p
></main>
<script>
const now = new Date(),
  year = now.getFullYear(),
  month = now.getMonth(),
  first = new Date(year, month, 1).getDay(),
  days = new Date(year, month + 1, 0).getDate(),
  body = document.querySelector("#calendar");
document.querySelector("#month").textContent = now.toLocaleDateString([], {
  month: "long",
  year: "numeric",
});
for (let slot = 0; slot < Math.ceil((first + days) / 7) * 7; slot++) {
  if (slot % 7 === 0) body.append(document.createElement("tr"));
  const td = document.createElement("td"),
    day = slot - first + 1;
  if (day > 0 && day <= days) {
    const time = document.createElement("time");
    time.textContent = String(day);
    time.dateTime =
      year +
      "-" +
      String(month + 1).padStart(2, "0") +
      "-" +
      String(day).padStart(2, "0");
    if (day === now.getDate()) {
      time.setAttribute("aria-current", "date");
      time.setAttribute("aria-label", day + ", today");
    }
    td.append(time);
  }
  body.lastChild.append(td);
}
document.querySelector("#today").textContent =
  "Today is " +
  now.toLocaleDateString([], {
    weekday: "long",
    month: "long",
    day: "numeric",
    year: "numeric",
  }) +
  ".";
</script>
</body>
</html>