Syntax
date.setHours(hours)
The setHours() method sets the hour in the Date object to the argument hours, an integer from 0 (12:00 a.m. midnight) to 23 (11:00 p.m.).
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>setHours returned "); document.write(theDate.setHours(7)," milliseconds.") document.write("<br>Final milliseconds=",theDate.getTime()); --> </script> </html>