This pnr was Stamped on july 12 at 12:43am and the Departure of this Train Today. Stamp buttons will appear on Both Situations before Departure date i.e either Confirm or Cancellation. Here it was Confirmed on 12th July and so I Stamped it as Confirm and Later Today it is Downgraded. And on 12th July if it was not Confirmed assume it was Cancelled and I Mistakenly Stamped it as Confirm. Then Today it will be Cancelled and not RAC.
Thanks.