The final scheduled south Wales derby of the season has been moved because of live television coverage.
Cardiff will now host arch-rivals Swansea at Ninian Park on Sunday, 5 April with an 1100 BST kick-off.
The two sides have already met twice at Swansea's Liberty Stadium, first in the Carling Cup which the Swans won 1-0 and then league which finished 2-2.
With both teams pushing for promotion to the Premier League, the game could have a huge effect on the outcome.
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