Posh are at Doncaster Rovers on the final day. The matches were originally scheduled for Saturday, May 8.
The dates have also been confirmed for the EFL play-offs with 12 fixtures set to take place over seven days across the Championship, League One and League Two.
The two-legged League One play-off semi-finals are scheduled for Tuesday May 18 & Wednesday, May 19, and Saturday, May 21 & Sunday, May 22.
The League One play-off final at Wembley is scheduled for Sunday, May 30 (3pm).
Posh have won two play-off finals at Wembley in May 1992 and May 2,000.