How can I compare two dates in format dd mmm yyyy? - asp.net

Question

I would like to compare two dates in this format dd mmm yyyy, compare validators wont work because of the format and custom validator is server side validation. I would like to have a clinet side validation. What would be the best way to do it? if you have any examples or links please let me know.
I dont know if there are options availables with ajax, jquery or javascript that can do this?
Cheers

Answer 1

Since JavaScript natively converts from MMM dd, yyyy, this would be one approach:
var date1Str = "09 Sep 2011";
var date2Str = "04 May 2012";
var dateParts = date1Str.split(" ");
var newDateStr = dateParts[1] + " " + dateParts[0] + ", " + dateParts[2];
var date1 = new Date( newDateStr );
var dateParts = date2Str.split(" ");
var newDateStr = dateParts[1] + " " + dateParts[0] + ", " + dateParts[2];
var date2 = new Date( newDateStr );
if ( date1 > date2 )
...
There are tons of links on the net to do date parsing in JavaScript and plenty of libraries that make it easier. Remember that culture plays a part. "Oct" is in English but in German it will be "Okt".

Answer 2

Here's a simple class you can use to compare dates; the convert function has been adjusted to accommodate your format:
<script type="text/javascript">
var dates = {
convert:function(d) {
return (
d.constructor === Date ? d :
d.constructor === Array ? new Date(d[1],d[0],d[2]) :
d.constructor === Number ? new Date(d) :
d.constructor === String ? new Date(d) :
typeof d === "object" ? new Date(d.year,d.month,d.date) :
NaN
);
},
compare:function(a,b) {
return (
isFinite(a=this.convert(a).valueOf()) &&
isFinite(b=this.convert(b).valueOf()) ?
(a>b)-(a<b) :
NaN
);
},
inRange:function(d,start,end) {
return (
isFinite(d=this.convert(d).valueOf()) &&
isFinite(start=this.convert(start).valueOf()) &&
isFinite(end=this.convert(end).valueOf()) ?
start <= d && d <= end :
NaN
);
}
}
</script>
Credit for this class belongs to #some: https://stackoverflow.com/a/497790/879420