<script>
<!--
thedate=new Date() ;
document.write("Sure!  It's : ", thedate.toLocaleString()) ;
//-->
</script>

The toLocaleString() method returns the local date and time.

<script>
<!--
thedate=new Date() ;
thedow=thedate.getDay() ;
thefullyear=thedate.getFullYear() ;
themonth=thedate.getMonth() ;
theday=thedate.getDate() ;
thetime=thedate.getTime() ;
thehours=thedate.getHours() ;
theminutes=thedate.getMinutes() ;
theseconds=thedate.getSeconds() ;
themilliseconds=thedate.getMilliseconds() ;
document.write("The day of the week is: ", thedow, "<br>") ;
document.write("The year is: ", thefullyear, "<br>") ;
document.write("The month is: ", themonth, "<br>") ;
document.write("The day is: ", theday, "<br>") ;
document.write("The time is: ", thetime, "<br>") ;
document.write("The hour is: ", thehours, "<br>") ;
document.write("The minute is: ", theminutes, "<br>") ;
document.write("The second is: ", theseconds, "<br>") ;
document.write("The millisecond is: ", themilliseconds) ;
//-->
</script>

Not very useful for display, unfortunately.

<script  language="JavaScript" type="text/javascript">
<!--
thedate=new Date() ;
theyear=thedate.getFullYear();
themonthnum=thedate.getMonth();
theday=thedate.getDate();
var themonthtxt ;
switch(themonthnum) {
case 0: themonthtxt='January' ; break ;
case 1: themonthtxt='February' ;  break ;
case 2: themonthtxt='March' ;  break ;
case 3: themonthtxt='April' ;  break ;
case 4: themonthtxt='May' ;  break ;
case 5: themonthtxt='June' ;  break ;
case 6: themonthtxt='July' ;  break ;
case 7: themonthtxt='August' ;  break ;
case 8: themonthtxt='September' ;  break ;
case 9: themonthtxt='October' ;  break ;
case 10: themonthtxt='November' ;  break ;
case 11: themonthtxt='December' ;  break ;
default: themonthtxt='Unknown month' ; break ; 
}
document.write("It's ", themonthtxt, ' ', theday, ', ', theyear) ;
//-->
</script>

A little work makes a much more readable date.

<script>
<!--
today = new Date() ;
christmas = new Date() ;
christmas.setMonth(11) ;
christmas.setDate(25) ;
// If Christmas hasn't already passed, compute the number of
// milliseconds between now and Christmas, then convert this
// to a number of days and print a message.

if (today.getTime() < christmas.getTime()) {
  differencems = christmas.getTime() - today.getTime() ;
  differencedays = Math.floor(differencems / (1000 * 60 * 60 * 24)) ;
  document.write('Only ' + differencedays + 'days (' + differencems.toLocaleString() + ' milliseconds) until Christmas!');
  }
else {document.write('Christmas has come and gone.  Wait until next year!')
   }
//-->
</script>