Create, read and format dates.
✍️ 3 exercises + code challenge in this lessonThe Date object works with dates and times.
new Date(): now.new Date(2026, 9, 22): year, month (0 = January!), day.new Date("2026-10-22"): from an ISO string.getFullYear(), getMonth(), getDate(), getDay(), getHours().toLocaleDateString(), toISOString(), Intl.DateTimeFormat.Mastering JavaScript Dates helps you write clean and reliable JavaScript code. Follow standard conventions, test edge cases, and keep logic simple. Try running the code example below and complete the exercises to build confidence.
<pre id="out"></pre>
<script>
const log = (...a) => document.getElementById("out").textContent += a.join(" ") + "\n";
const now = new Date();
log("Now:", now.toLocaleString());
const launch = new Date(2026, 11, 31);
log("Launch:", launch.toDateString());
const days = Math.ceil((launch - now) / (1000 * 60 * 60 * 24));
log("Days until launch:", days);
log(now.toLocaleDateString("en-GB", { weekday: "long", day: "numeric", month: "long", year: "numeric" }));
log("ISO:", now.toISOString());
</script>Check what you learned in “JavaScript Dates”.
Create a Date object for the current moment.
const now = ;
In new Date(2026, 0, 15), which month is 0?
Create the date 15 August 2026 and log its year.
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