Hi,
Yes, it is valid in JOSAA councelling.
On 29th june the DU said that those students who do not have the new EWS certificate can upload and submit the older one for completing the registration. Such students, its also told that you can submit the new EWS certificate later during document verification with valid Tehsildar Signature.
Ews certificate with signature from your tehsildar will be valid for DU application form this year too. So you don't have to worry about that.
Hope this helps.
All the best.
Regular exam updates, QnA, Predictors, College Applications & E-books now on your Mobile