/**
* Calculate Age
*
* Calculates the amount of time since the date specified with yr, mon, and day.
* The parameter "countunit" can be "years", "months", or "days" and is the duration
* between the specified day and today in the selected denomination. The "decimals"
* parameter allows you to set a decimal place to round to for days and months return
* values. Rounding is also meant for days and months and can be "roundup" or "rounddown"
* based solely on the properties of Math.ceil and math.floor respectively.
* Sample - displayage(1997, 11, 24, "years", 0, "rounddown")
*/
function displayage( yr, mon, day, countunit, decimals, rounding ) {
// Starter Variables
today = new Date();
yr = parseInt(yr);
mon = parseInt(mon);
day = parseInt(day);
var one_day = 1000*60*60*24;
var one_month = 1000*60*60*24*30;
var one_year = 1000*60*60*24*30*12;
var pastdate = new Date(yr, mon-1, day);
var return_value = 0;
finalunit = ( countunit == "days" ) ? one_day : ( countunit == "months" ) ? one_month : one_year;
decimals = ( decimals <= 0 ) ? 1 : decimals * 10;
if ( countunit != "years" ) {
if ( rounding == "rounddown" )
return_value = Math.floor ( ( today.getTime() - pastdate.getTime() ) / ( finalunit ) * decimals ) / decimals;
else
return_value = Math.ceil ( ( today.getTime() - pastdate.getTime() ) / ( finalunit ) * decimals ) / decimals;
} else {
yearspast = today.getFullYear()-yr-1;
tail = ( today.getMonth() > mon - 1 || today.getMonth() == mon - 1 && today.getDate() >= day ) ? 1 : 0;
return_value = yearspast + tail;
}
return return_value;
}
//javascript/2116