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<!DOCTYPE html> <html> <body> <h2>JavaScript Dates</h2> <p>Date.UTC() returns the number of milliseconds between a date and January 1, 1970, according to UTC:</p> <p id="demo"></p> <script> let ms = Date.UTC(2020, 02, 30); document.getElementById("demo").innerHTML = ms; </script> </body> </html>
