var today = new Date()
 var targetDate = new Date("12/25/2002") //use full year 
 var timeBeforeTarget = Math.floor(( targetDate.getTime()
   - today.getTime()) / 86400000)
 var msg = "<div align=center><B>There are "  + (timeBeforeTarget +1)  
    + " days until Christmas.</B></div>"
 document.write(msg)