//Set the two dates
today=new Date()
var concert=new Date(2010, 0, 24) //Month is 0-11 in JavaScript
if (today.getMonth()==0 && today.getDate()>24) //if date has passed already
concert.setFullYear(concert.getFullYear()+1) //calculate next year's date
//Set 1 day in milliseconds
var one_day=1000*60*60*24
var TicketsRemain = Math.round(  ( (concert.getTime()-today.getTime()) / (one_day) ) * (7/5) - 6  )