IE : input a date in pop calendar

[trinag]

How can I input a date in the Date field athttp://www.irctc.co.in ?
Using the below method I succeeded with the other fields From*,To*,TicketType*,Quota*, but not with the  Date.
I also tried _IEImgClick, but without success.

#include <IE.au3>

Local $oIE = _IECreate("http://www.irctc.co.in")
 $oElement = _IEGetObjByName($oIE, "userName")
   _IEFormElementSetValue ($oElement,"trinag");, "userName"))
   Sleep(500)
   $oElement = _IEGetObjByName($oIE, "password")
   _IEFormElementSetValue ($oElement, "twk162"); "password")
   Sleep(500)
   $Button = _IEGetObjByName($oIE,"button")
   _IEAction($Button,'Click')
   _IELoadWait($oIE)