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author: iv [+], Submitted: 07.23.04 12p

// © Ivan Dembicki, dembicki@narod.ru
Date.prototype.getDifference = function(finish_date) {
 var yy = 0, mm = 0, dd = 0, hh = 0, mn = 0, ss = 0, ms = 0, diff, s_date, f_date, dir
 if (this>finish_date) {
  s_date=new Date(finish_date), f_date=new Date(this), dir=false;
 } else {
  s_date=new Date(this), f_date=new Date(finish_date), dir=true;
 }
 ms = f_date.getMilliseconds()-s_date.getMilliseconds();
 if (ms<0) {
  f_date.setSeconds(f_date.getSeconds()-1), ms += 1000;
  if (f_date<s_date) {
   return {remind:dir, years:yy, months:mm, days:dd, hours:hh, minutes:mn, seconds:ss, milliseconds:ms};
  }
 }
 ss = f_date.getSeconds()-s_date.getSeconds();
 if (ss<0) {
  f_date.setMinutes(f_date.getMinutes()-1), ss += 60;
  if (f_date<s_date) {
   return {remind:dir, years:yy, months:mm, days:dd, hours:hh, minutes:mn, seconds:ss, milliseconds:ms};
  }
 }
 mn = f_date.getMinutes()-s_date.getMinutes();
 if (mn<0) {
  f_date.setHours(f_date.getHours()-1), mn += 60;
  if (f_date<s_date) {
   return {remind:dir, years:yy, months:mm, days:dd, hours:hh, minutes:mn, seconds:ss, milliseconds:ms};
  }
 }
 hh = f_date.getHours()-s_date.getHours();
 if (hh<0) {
  f_date.setDate(f_date.getDate()-1), hh += 24;
  if (f_date<s_date) {
   return {remind:dir, years:yy, months:mm, days:dd, hours:hh, minutes:mn, seconds:ss, milliseconds:ms};
  }
 }
 dd = f_date.getDate()-s_date.getDate();
 if (dd<0) {
  var diff = f_date.getTime();
  f_date.setMonth(f_date.getMonth()-1), diff=Math.floor((diff-f_date.getTime())/(24*60*60*1000)), dd += diff;
  if (f_date<s_date) {
   return {remind:dir, years:yy, months:mm, days:dd, hours:hh, minutes:mn, seconds:ss, milliseconds:ms};
  }
 }
 mm = f_date.getMonth()-s_date.getMonth();
 if (mm<0) {
  f_date.setFullYear(f_date.getFullYear()-1), mm += 12;
  if (f_date<s_date) {
   return {remind:dir, years:yy, months:mm, days:dd, hours:hh, minutes:mn, seconds:ss, milliseconds:ms};
  }
 }
 yy = f_date.getFullYear()-s_date.getFullYear();
 return {remind:dir, years:yy, months:mm, days:dd, hours:hh, minutes:mn, seconds:ss, milliseconds:ms};
};
ASSetPropFlags(Date.prototype, "getDifference", 7, 1)

usage

// test:
this.finish = new Date();
this.finish.setSeconds(this.finish.getSeconds()+30);
this.createTextField("remind_txt", 0, 0, 0, 200, 200);
this.onEnterFrame = function() {
 var foo = new Date().getDifference(this.finish), i, str = "";
 for (i in foo) {
  str += i+": "+foo[i]+"\n";
 }
 this.remind_txt.text = str;
};

msg1 { evil grin [+], posted: 11.25.04 3a•11.25.04 3a, top [^] }

what an inspiring sight! =))

// __________________________________________________________
Date.prototype.getDifference = function(finish_date) {
	var diff = Math.abs(finish_date-this);
	var rem = new Date();
	rem.setTime(diff+this.getTimezoneOffset()*60*1000);
	rem.$toString = rem.toString;
	ASSetPropFlags(rem, "$toString", 7, 1);
	rem.toString = rem.getPlainTime;
	return rem;
};
Date.prototype.getPlainTime = function() {
	return (this.$toString().split(" ")[3]+":"+this.getMilliseconds());
};
ASSetPropFlags(Date.prototype, "getDifference", 7, 1);
ASSetPropFlags(Date.prototype, "getPlainTime", 7, 1);
// __________________________________________________________
// ** testing **
finish = new Date();
finish.setSeconds(finish.getSeconds()+30);
this.createTextField("TF", 0, 0, 0, 200, 200);
//
this.onEnterFrame = function() {
	//
	var countdown = new Date().getDifference(finish);
	this.TF.text = countdown;
	//
};

msg2 { iv [+], posted: 11.25.04 4a•-, top [^] }

of course. If you needn't days and higer.

msg3 { evil grin [+], posted: 11.25.04 4a•-, top [^] }

I get it.
But, well, if I do need that big delays, I just correct the toString() method to output days, years, and centuries. Just as I did it with milliseconds.

I was not meaning to offend you, but your method just looks enormous =)