function cdtime(container, targetdate){
    if (!document.getElementById || !document.getElementById(container)) return
    this.container=document.getElementById(container)
    this.currentTime=new Date()
    this.targetdate=new Date(targetdate)
    this.timesup=false
    this.updateTime()
    }
    
    cdtime.prototype.updateTime=function(){
    var thisobj=this
    this.currentTime.setSeconds(this.currentTime.getSeconds()+1)
    setTimeout(function(){thisobj.updateTime()}, 1000) //update time every second
    }
    
    cdtime.prototype.displaycountdown=function(baseunit, functionref){
    this.baseunit=baseunit
    this.formatresults=functionref
    this.showresults()
    }
    
    cdtime.prototype.showresults=function(){
    var thisobj=this
    
    
    var timediff=(this.targetdate-this.currentTime)/1000 //difference btw target date and current date, in seconds
    if (timediff<0){ //if time is up
    this.timesup=true
    this.container.innerHTML=this.formatresults()
    return
    }
    var oneMinute=60 //minute unit in seconds
    var oneHour=60*60 //hour unit in seconds
    var oneDay=60*60*24 //day unit in seconds
    var dayfield=Math.floor(timediff/oneDay)
    var hourfield=Math.floor((timediff-dayfield*oneDay)/oneHour)
    var minutefield=Math.floor((timediff-dayfield*oneDay-hourfield*oneHour)/oneMinute)
    var secondfield=Math.floor((timediff-dayfield*oneDay-hourfield*oneHour-minutefield*oneMinute))
    if (this.baseunit=="hours"){ //if base unit is hours, set "hourfield" to be topmost level
    hourfield=dayfield*24+hourfield
    dayfield="n/a"
    }
    else if (this.baseunit=="minutes"){ //if base unit is minutes, set "minutefield" to be topmost level
    minutefield=dayfield*24*60+hourfield*60+minutefield
    dayfield=hourfield="n/a"
    }
    else if (this.baseunit=="seconds"){ //if base unit is seconds, set "secondfield" to be topmost level
    var secondfield=timediff
    dayfield=hourfield=minutefield="n/a"
    }
    this.container.innerHTML=this.formatresults(dayfield, hourfield, minutefield, secondfield)
    setTimeout(function(){thisobj.showresults()}, 1000) //update results every second
    }
    
    /////CUSTOM FORMAT OUTPUT FUNCTIONS BELOW//////////////////////////////
    
    //Create your own custom format function to pass into cdtime.displaycountdown()
    //Use arguments[0] to access "Days" left
    //Use arguments[1] to access "Hours" left
    //Use arguments[2] to access "Minutes" left
    //Use arguments[3] to access "Seconds" left
    
    //The values of these arguments may change depending on the "baseunit" parameter of cdtime.displaycountdown()
    //For example, if "baseunit" is set to "hours", arguments[0] becomes meaningless and contains "n/a"
    //For example, if "baseunit" is set to "minutes", arguments[0] and arguments[1] become meaningless etc
    
    
    function formatresults2(){
    if (this.timesup==false){ //if target date/time not yet met
    var displaystring="<b>My next show is in:</b><div class='lcdstyle'>"+arguments[0]+" <span style=color:#000>days</span> "+arguments[1]+" <span style=color:#000>hrs</span> "+arguments[2]+" <span style=color:#000>mins</span> "+arguments[3]+" <span style=color:#000>secs</span></div>"
    }
    else{ //else if target date/time met
    var displaystring="" //Don't display any text
    }
    return displaystring
    }