28 June 2018: EU summit may include Northern Ireland border discussion
18 October 2018: The key EU summit. Both sides hope to agree outline of future relations to allow time for UK parliament and EU members to ratify deal by Brexit day
13 December 2018: EU summit. If deal not done by October, this is the fall back option if the two sides still want to reach agreement
Commons and Lords vote on withdrawal treaty - MPs could reject the deal but it's not clear what would happen if that is the case
The UK Parliament also needs to pass an implementation bill before Brexit day
29 March 2019: As things stand, deal or no deal, Brexit is due to happen at 11pm UK time
31 December 2020: If all goes to plan a transition period will then last until midnight on this date