extjs4 - compare date retrieved from datefield to current date in EXTJS -

i want compare date retrieve o datefield (xtype: 'datefield',) current date. i've done next :

validatedatedebut : function(datedebutid) {             var datedebutfield = ext.getcmp(datedebutid);             var datedepuis = ext.date.format(datedebutfield.getvalue(),'d/m/y');              var datecourrante = ext.date.format(new date(),'d/m/y');              if (datecourrante < datedepuis) {                 alert("date value provided larger" );             } else {                     alert("date value provided less" );             } } 

where datedebutid id of datefield. problem "date value provided less".

validatedatedebut : function(datedebutid) {             var datedebutfield = ext.getcmp(datedebutid);             var datedepuis_formated = ext.date.format(datedebutfield.getvalue(),'d/m/y');              var datecourrante_formated = ext.date.format(new date(),'d/m/y');              var datedepuis = ext.date.parse(datedepuis_formated ,'d/m/y');             var datecourrante = ext.date.parse(datecourrante_formated ,'d/m/y');              if (datecourrante < datedepuis) {                 alert("date value provided larger" );             } else {                     alert("date value provided less" );             } }