Pompey’s game at MK Dons had previously been brought forward to 1pm for an unrelated reason.
It was announced yesterday that it would be changed again to a 12.30pm kick-off to avoid any overlap with proceedings at Windsor.
Now the league’s governing body has confirmed that all Championship and League One and Two games will be rescheduled.
A one minute’s silence prior to kick-off will also be held.
Meanwhile, all players, coaching staff and match officials will wear armbands during this period as a mark of respect.
The Duke of Edinburgh died at the age of 99 on Friday.
His funeral will be held at St George's Chapel in Windsor at 3pm on Saturday, with a national minute's silence beginning at the same time.
Below is the new kick-off times for all clubs in League One:
Friday, April16
Northampton v Peterborough (7.45pm).
Saturday, April 17 (12.30pm kick-offs unless stated)
AFC Wimbledon v Swindon Town (5.30pm)
Blackpool v Sunderland
Bristol Rovers v Lincoln City
Burton Albion v Plymouth Argyle
Charlton Athletic v Ipswich Town
Hull City v Fleetwood Town
MK Dons v Pompey
Oxford United v Gillingham (5.30pm)
Rochdale v Accrington Stanley
Shrewsbury Town v Doncaster Rovers
Wigan Athletic v Crewe Alexandra