Use the newest methods of getting a user's birth month/day.

Remove birthdate.js - not needed or used anywhere (anymore).

exec/load/birthdate.js

-// $Id: birthdate.js,v 1.4 2018/06/06 21:44:23 rswindell Exp $
-/*
- * When this code is load()ed, User objects get an extra 'birthDate' property
- * which is a JavaScript Date object representing the user's birthdate.
- */
-
-User.prototype.__defineGetter__("birthDate", function() {
-	var mfirst=system.datestr(1728000).substr(0,2)=='01';
-	var match;
-	var m,d,y;
-
-	match=this.birthdate.match(/^([0-9]{2})[-/]([0-9]{2})[-/]([0-9]{2})$/);
-	if(match==null)
-		return undefined;
-	m=parseInt(match[mfirst?1:2],10)-1;
-	d=parseInt(match[mfirst?2:1],10);
-	y=parseInt(match[3],10)+1900;
-	if(this.age + y < (new Date()).getYear()-2)
-		y+=100;
-	return new Date(y,m,d);
-});

exec/load/birthdays.js

-// $Id: birthdays.js,v 1.1 2018/06/06 23:07:20 rswindell Exp $
-
 // Find users with the specified birthday (or birthmonth)
 
 // Usage (Birthdays in January):
@@ -12,7 +10,6 @@
 // list = load({}, "birthdays.js", new Date().getMonth(), new Date().getDate());
 
 load("sbbsdefs.js");
-load("birthdate.js");
 
 // Returns an array of user numbers
 // Note: month is 0-based, day (of month) is optional and 1-based
@@ -21,14 +18,15 @@ function birthdays(month, day)
 	var u = new User;
 	var lastuser = system.stats.total_users;
 	var list = [];
+	month = parseInt(month, 10) + 1;
 	for(u.number = 1; u.number <= lastuser; u.number++) {
 		if(u.settings&(USER_DELETED|USER_INACTIVE))
 			continue;
 		if(u.security.restrictions&(UFLAG_Q|UFLAG_G))
 			continue;
-		if(u.birthDate.getMonth() != month)
+		if(u.birthmonth != month)
 			continue;
-		if(day && u.birthDate.getDate() != day)
+		if(day && u.birthday != day)
 			continue;
 		list.push(u.number);
 	}