/*
Ultimate Age calculator script- By JavaScript Kit (http://www.javascriptkit.com)
Over 200+ free scripts here!
Credit must stay intact for use
*/

var one_day=1000*60*60*24
var one_month=1000*60*60*24*30
var one_year=1000*60*60*24*30*12

function displayage(yr, mon, day, unit, decimal, round){
	today=new Date()
	var pastdate=new Date(yr, mon-1, day)
	
	var countunit=unit
	var decimals=decimal
	var rounding=round
	
	var return_val = "ERROR";
		
	finalunit=(countunit=="days")? one_day : (countunit=="months")? one_month : one_year
	decimals=(decimals<=0)? 1 : decimals*10
	
	if (unit!="years"){
		if (rounding=="rounddown") {
			return_val = Math.floor((today.getTime()-pastdate.getTime())/(finalunit)*decimals)/decimals+" "+countunit;
		}
		else {
			return_val = Math.ceil((today.getTime()-pastdate.getTime())/(finalunit)*decimals)/decimals+" "+countunit;
		}
	}
	else{
		yearspast=today.getFullYear()-yr-1
		tail=(today.getMonth()>mon-1 || today.getMonth()==mon-1 && today.getDate()>=day)? 1 : 0
		pastdate.setFullYear(today.getFullYear())
		pastdate2=new Date(today.getFullYear()-1, mon-1, day)
		tail=(tail==1)? tail+Math.floor((today.getTime()-pastdate.getTime())/(finalunit)*decimals)/decimals : Math.floor((today.getTime()-pastdate2.getTime())/(finalunit)*decimals)/decimals
		return_val = yearspast+tail+" "+countunit;
	}
	return return_val;
}

function getAgeInMonths(yr,mon,day) {
	return parseInt(displayage(yr, mon, day, "months", 0, "rounddown")); 
}