According to the House of Representatives website, Marlin Stutzman was sworn in as the Indiana 3rd Congressional District Representative at 5:00 pm.
From the Office of the Clerk of the US House of Representatives website:
5:00 P.M. – ADMINISTERING THE OATH OF OFFICE – Representative-Elect Marlin A. Stutzman from the Third Congressional District, State of Indiana, presented himself in the well of the House to take the Oath of Office administered by the Speaker of the House.
The House received a message from the Clerk. The Clerk transmitted to the House a facsimile copy of a letter received from Mr. Todd Rokita, Secretary of State, State of Indiana, indicating that based on the unofficial results of the election held on November 2, 2010, the Honorable Marlin A. Stutzman was elected Representative in Congress for the Third Congressional District, State of Indiana.
5:01 P.M. – The Dean of the Indiana delegation, Representative Dan Burton, addressed the House and introduced Representative Marlin Stutzman, Third District, Indiana.
5:06 P.M. – ADJUSTED WHOLE NUMBER OF THE HOUSE – Under clause 5(d) of rule 20, the Chair announced to the House that, in light of the administration of the oath to the gentleman from Indiana, the whole number of the House is 434.
5:07 P.M. – Considered as unfinished business.