validating Dates

Hi
I need to validate two date inputs in the DD/MM/YYYY format: start_date and end_date. Obviously the start_date cannot after the end_date (or end_date before the start_date).
I am using the following piece of code:
function checkMForm ( form ) {
StartDate = new Date(form.start_date.value);
EndDate = new Date(form.end_date.value);

ddFrom=StartDate.getDate();
ddTo=EndDate.getDate();

mmFrom=StartDate.getMonth();
mmTo=EndDate.getMonth();
mmFrom+=1;
mmTo+=1;

yyyyFrom = StartDate.getFullYear();
yyyyTo=EndDate.getFullYear();

if (ddFrom>ddTo && yyyyTo==yyyyFrom && mmTo==mmFrom)
{
alert("Invalid Date: Day");
return(false);
}
else if(mmFrom>mmTo && yyyyTo==yyyyFrom)
{
alert("Invalid Date: Month");
return(false);
}

else if (yyyyFrom>yyyyTo)
{
alert("Invalid Date: Year");
return(false);
}

return (true) ;
}
At first glimpse this appeared to work until the start_date was at the end of one month and the end_date at the being on the next. Then it displayed the error message �invalid Date: year� even though it was a perfectly valid entry.
Can anyone help with this code or perhaps suggest some other way of checking dates?
Cheers
Ross

Ross,
U need lot of other validations also like if suppose a date like this 02/30/20003 which is not correct. I have written a js code to validate date in the format mm/dd/yyyy which also checks start date can not be after end date. if u need i can mail it u

Yes please, would be a great help.
cheers.
r.varlese@derby.ac.uk

mailed...check mailbox

mailed...check mailbox

Well I'm sure that's very helpful to others that will have the same question.
bear

Since product, that I am working on supports all kind of different locales and date formats,
I prefer to validate Date on a server side.

Originally posted by Bear Bibeault:

Well I'm sure that's very helpful to others that will have the same question.
bear

Bear ..the reason why i didnt put the code that code is according to naming conventions i used in the form even the alert messages.
i can post the code no problem..im too lazy 2day to change the alert messages.....Then another thing wat i ahd done i took the system date upfront coz there is a probality that users can change the date in their pc...
one function in the code checks the birth date is less than start date whcih is not required for anyone so u can take that off.

not allwoing me to post the code
coz of html tag
i can mail u the code and u can post the code

Yeah, that is a pain sometimnes, isn't it?
Perhaps you could summarize what fixed the problem for you for the benefit of future searchers of this topic?
bear

Okay, This is it, I will make a utility tat will escape the code for this website so it will be easier for people to post. I should have it up and running fully by tom afternoon. (EST)
I will see if I can get it linked on top page of this forum.
Eric

I will make a utility tat will escape the code for this website

you == forum hero

bear

I got permission to do it, I will see if I get it done tonight, and have it up in a couple of days.
All it is is some regular exp. with replace.
What Fun!
Eric

Thanks Eric.....