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<!DOCTYPE html> <html> <body> <h1>JavaScript Date vs Temporal</h1> <p>JavaScript legacy Date can cause leap year errors.</p> <p id="demo"></p> <script> // Create a Date object const start = new Date("2026-05-17"); // Add 12 days start.setDate(start.getDate() + 12); document.getElementById("demo").innerHTML = "The result is " + start.toString(); </script> </body> </html>
