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<!DOCTYPE html> <html> <body> <h1>JavaScript Temporal.ZonedDateTime</h1> <h2>The startOfDay() Method</h2> <p>The startOfDay() method returns a ZonedDateTime object representing the first instant of this date in the time zone.</p> <p id="demo"></p> <script> const zoned = Temporal.ZonedDateTime.from("2026-05-17T14:30:00[Europe/Oslo]"); const start = zoned.startOfDay(); document.getElementById("demo").innerHTML = start.toString(); </script> </body> </html>
