I need to validate few dates in my SP  2010 customnewform.aspx page.    
I added the content editor web part, added the script but not able to get the result.  
ReqstDate : Should not be greater than Today's Date.End user can select yesterdays's date also but not tomorrow's date.  By default I need to populate/bind the ReqstDate field with Today's date when the new form loads.  
Due By date : Should be greater than ReqstDate  
Orals Date : should not be greater than Due By Date

Is this possible throiugh jQuery or SPServices using PreSaveAction function