The committee, which has been asked to submit its report within a week, would also suggest steps needed to prevent any such eventuality in future.
In a statement, the poll watchdog referred to a tweet by BJP IT cell chief Amit Malviya in which he had put out the election date minutes before CEC O P Rawat actually announced the schedule at a press conference.
Mr Malviya tweeted that polls would be held on May 12 and counting will take place on May 18. While he was correct about the date of polling, he got the counting date wrong which will actually take place on May 15.
"The Commission immediately directed that the matter be probed and necessary and effective action be taken. Accordingly, Commission has constituted a committee of senior officers of Election Commission to investigate the matter and give its report within seven days.
"The Committee would also suggest steps needed to prevent any such eventuality in future. The Committee set up by the Commission has already sought information from the concerned media organisations and individuals, the statement read.
It said Mr Malviya, in another tweet, had attributed a news channel as his source.
In his press conference to announce the poll schedule, Mr Rawat had described the leak as a "very serious" issue that merited a probe and "stringent action".
He said people can conjecture but noted that as information has been "leaked", the Election Commission will probe the matter and take "stringent action" both "legally and administratively".