Comments on: HOWTO: Using AS3 to Get Age from Birthday (Birthdate)

By: Seba

Seba — Wed, 22 Oct 2008 06:08:34 +0000

A new version, previous one had an error, please ignore previous post.

Thanks

var dateNow:Date = new Date();
var checkDate:String = “12/22/2000″;
var dateBirthday:Date = dateStringToObject(checkDate);
trace(“dateNow = “+dateNow);
trace(“dateBirthday = “+dateBirthday);
calculateAge(dateBirthday)

function calculateAge(birthdate:Date):void {
var dtNow:Date = new Date();// gets current date
var currentMonth:Number = dtNow.getMonth() + 1 ;
var currentDay:Number = dtNow.getDate();
var currentYear:Number = dtNow.getFullYear();

var bdMonth:Number = birthdate.getMonth() + 1;
var bdDay:Number = birthdate.getDate();
var bdYear:Number = birthdate.getFullYear();

// get the difference in years
var years:Number = dtNow.getFullYear() – birthdate.getFullYear();
var months:Number
var weeks:Number
var days:Number

// subtract another year if we’re before the
// birth day in the current year
if (currentMonth < bdMonth || (currentMonth == bdMonth && currentDay bdMonth){ // Current Mont is Bigger than Birthday Month

months = currentMonth – bdMonth – 1
if(currentDay > bdDay){
months++
days = currentDay – bdDay
weeks = Math.floor(days / 7)
days %=7

}else if(currentDay == bdDay){
months++
days = 0;
weeks = 0
}else{// currentDay is smaller than bdDay
// this is not trivial
// here we calculate the days from the bdDay of the previous month + currentDay
days = getDays(currentMonth – 1, dtNow) – bdDay + currentDay
weeks = Math.floor(days / 7)
days %=7
}
}else if(currentMonth == bdMonth){

if(currentDay > bdDay){
months = 0
days = currentDay – bdDay
weeks = Math.floor(days / 7)
days %=7
}else if(currentDay == bdDay){
months = 0
days = 0
weeks = 0
}else{// currentDay is smaller than bdDay
months = 11
days = getDays(currentMonth – 1, dtNow) – bdDay + currentDay
weeks = Math.floor(days / 7)
days %=7
}
}else{ // this is when the currentMonth is smaller than bdMonth
months = (12 – bdMonth) + (currentMonth – 1)

if(currentDay > bdDay){
months++
days = currentDay – bdDay
weeks = Math.floor(days / 7)
days %=7
}else if(currentDay == bdDay){
months++
days = 0
weeks = 0
}else{// currentDay is smaller than bdDay
days = getDays(currentMonth – 1, dtNow) – bdDay + currentDay
weeks = Math.floor(days / 7)
days %=7
}
}

trace (“age:” + years)
trace (“months:” + months)
trace (“weeks:” + weeks)
trace (“days:” + days)

//var time:String = years + ” years, ” + months + ” months, ” + weeks + ” weeks, ” + days + ” days old” ;
}

function getDays(previousMonth:Number, nowDate:Date):Number{

var isLeap:Boolean = (nowDate.getFullYear()%4) == 0
trace(“Is leap =” + isLeap)
trace(“previousMonth=” + previousMonth )
switch(previousMonth){
case 0:/*Dec*/ return 31
case 1:/*Jan*/ return 31
case 2:/*Feb*/ if (isLeap == 0){ return 29 }else{ return 28 }
case 3:/*Mar*/ return 31
case 4:/*Apr*/ return 30
case 5:/*May*/ return 31
case 6:/*Jun*/ return 30
case 7:/*Jul*/ return 31
case 8:/*Aug*/ return 31
case 9:/*Sep*/ return 30
case 10:/*Oct*/ return 31
case 11:/*Nov*/ return 30
}
return 0
}

function dateStringToObject(dateString):Date {
var date_ar = dateString.split(“/”);
return new Date(date_ar[2],date_ar[0] – 1,date_ar[1]);
}

By: Seba

Seba — Wed, 22 Oct 2008 05:58:00 +0000

Hi Guys, I am using this in an application we have developed. Just based on initial code. It may need some cleanup and optimization, but wanted to put it in here as a beta version

function calculateAge(birthdate:Date):Number {
var dtNow:Date = new Date();// gets current date
var currentMonth:Number = dtNow.getMonth() + 1 ;
var currentDay:Number = dtNow.getDate();
var currentYear:Number = dtNow.getFullYear();

var bdMonth:Number = birthdate.getMonth() + 1;
var bdDay:Number = birthdate.getDate();
var bdYear:Number = birthdate.getFullYear();

// get the difference in years
var years:Number = dtNow.getFullYear() – birthdate.getFullYear();
var months:Number
var weeks:Number
var days:Number

// subtract another year if we’re before the
// birth day in the current year
if (currentMonth < bdMonth || (currentMonth == bdMonth && currentDay bdMonth){
months = currentMonth – bdMonth – 1

if(currentDay > bdDay){
months++
days = currentDay – bdDay
weeks = Math.floor(days / 7)
days %=7

trace (“age:” + years)
trace (“months:” + months)
trace (“weeks:” + weeks)
trace (“days:” + days)

//var time:String = years + ” years, ” + months + ” months, ” + weeks + ” weeks, ” + days + ” days old” ;

//time_txt.text = time;
}

function getDays(previousMonth:Number, nowDate:Date):Number{

var residual:Number = nowDate.getFullYear()%4
trace(“Is leap =” + residual)

trace(“previousMonth=” + previousMonth )
switch(previousMonth){
case 0://December
return 31
break
case 1://Jaunary
return 31
break
case 2://February
if (residual == 0){
return 29
}else{
return 28
}
break

case 3://March
return 31
break
case 4://April
return 30
break
case 5://May
return 31
break

case 6://June
return 30
break
case 7://Jul
return 31
break
case 8://Aug
return 31
break

case 9://Sep
return 30
break
case 10://Oct
return 31
break
case 11://Nov
return 30
break
}

return 0
}

function dateStringToObject(dateString):Date {
var date_ar = dateString.split(“/”);
return new Date(date_ar[2],date_ar[0] – 1,date_ar[1]);
}

By: Ormus

Ormus — Thu, 04 Sep 2008 11:41:58 +0000

*challenge

By: Ormus

Ormus — Thu, 04 Sep 2008 11:41:13 +0000

the chalange it’s to get age like years, months, days. Thx.

By: jcip

jcip — Tue, 13 May 2008 18:07:04 +0000

On lines 4 and 8 you should be using getDate() for the numerical day of the month. getDay() returns the numerical day of the week.

Other than that, thanks!

By: GB

GB — Thu, 17 Apr 2008 07:05:40 +0000

Bugaga, am/kg )
Joseph +1

By: keita

keita — Thu, 17 Apr 2008 03:27:43 +0000

How about this?
it’s more accurate.

var bDate:Date = new Date(1978, 3, 28);
var today:Date = new Date();
var age:Date = new Date(today.time – bDate.time);
age.fullYear -= 1970;
trace(age);

By: Joseph

Joseph — Wed, 16 Apr 2008 22:44:40 +0000

Here’s a simpler version…

function calculateAge(birthdate:Date):int {
return Math.floor( ((new Date()).getTime()-birthdate.getTime())/31536000000 );
}

OK, maybe not as leap year friendly, but it works.