Prototype ¬ Detail

author: e_guesdon@hotmail.com [+], Submitted: 05.23.03 9a

Date.prototype.delta = function(d,unit){
	if(d instanceof Date == false) d = new Date() ;
	switch(unit.toLowerCase()){
		case "year" :
				return Math.floor(Math.abs((d - this) / (1000*60*60*24*365.25))) ;
				break ;
		case "month" :
				return Math.floor(Math.abs((d - this) / (1000*60*60*24*365/12))) ;
				break ;
		case "day" : 
				return Math.floor(Math.abs((d - this) / (1000*60*60*24))) ;
				break ;
		case "hour" :
				return Math.floor(Math.abs((d - this) / (1000*60*60))) ;
				break ; 
		case "minute" :
				return Math.floor(Math.abs((d - this) / (1000*60))) ;
				break ;
		case "second" :
				return Math.floor(Math.abs((d - this) / (1000))) ;
				break ;
		case "millisecond" :
				return Math.abs(d - this) ;
				break ;
		 
	}
}

usage

this proto can be use to compare 2 dates in year - month - day - hour - minute - second
if you want to compare a defined date with today, 
first argument can be define to anything (null, undefined, today etc...)

Examples

1 ==> I want dif in year between myBirthDate and today

myBirthDate = new Date(1969,0,22)
trace(myBirthDate.delta(null,"year")) // return 34 (i'm not finish, i'm a very young boy !!)

2 ==> I want dif in month between myBirthDate and MyDaugtherBirthDate

myBirthDate = new Date(1969,0,22)
MyDaugtherBirthDate = new Date(2002,4,27)

trace(myBirthDate.delta(MyDaugtherBirthDate,"Month")) // you can write Month with M in uppercase
                                                      // even proto compare with month cos' i prevent
                                                      // key errors with toLowerCase() function

etc... 

Thanks for your comment(s)

Eric