Syntax
date.setUTCDate(day)
The setUTCDate() method sets the day of the month in the Date object to the argument day, an integer from 1 to 31 universal time.
The method returns an integer representing the number of milliseconds between midnight January 1, 1970 (GMT) to the new date.
<html> <script language="JavaScript"> <!-- theDate = new Date(); document.write("Initial milliseconds=",theDate.getTime()); document.write("<br>setUTCDate returned "); document.write(theDate.setUTCDate(6)," milliseconds.") document.write("<br>Final milliseconds=",theDate.getTime()); --> </script> </html>