What is the Date Selector Control used on the forums advanced search page?

What is the date control used on this forums "advanced search page" when you select "On" or "Between"

I would like to use a control like this in an application I'm working on.

What I'm looking for is something very much like that but..

I can specify the date format at runtime (For different cultures)

Uses numbers instead of words so something like 08/08/2007

Has client side validation of valid dates

Has a calendar popup control

JMONACO:

What is the date control used on this forums "advanced search page" when you select "On" or "Between"

If you look at the source of the html, you'll find this line:

window.ctl00_bcr_ctl02_ctl00_StartDate = new Telligent_DateTimeSelector ('ctl00_bcr_ctl02_ctl00_StartDate','ctl00_bcr_ctl02_ctl00_StartDate_text','<January,February,March,April,May,June,July,August,September,October,November,December> <1-31> <0001-9999>',2,0,1,-1,-1,-1,true,false);

It looks like a variation of the Ajax CalendarExtender.