This website showing 12066 runs on F S only, while it runs on M T W F S.
It’s a Bi-weekly train.run only on Friday and Sunday. Only 2S & CC class available.
May be due to some error its showing incorrect running days and yes you are right 12066 train runs on M T W F S as per National Train Enquiry System. You can also check the train time table by visiting the following link :