British Prime Minister Theresa May delivers a statement in the Parliament in London, Britain March 25, 2019, in this still image taken from video. Reuters TV/via REUTERS

LONDON (Reuters) - Prime Minister Theresa May said on Monday that parliament would debate secondary legislation on Wednesday to formally change the date of Brexit in British law.

Britain was due to leave the European Union on March 29, but May agreed with the bloc’s leaders last week to delay that date to May 22 if her Brexit agreement is approved by parliament this week, or to April 12 if it is not.

May earlier told parliament the exit date had already been changed in international law and so if parliament did not pass this legislation it would “cause legal confusion and damaging uncertainty” but would not impact the date of Brexit.