The vote will have massive implications for the Irish economy...
Reports from London say that senior figures have been told by 10 Downing Street that June 23rd is the preferred date for a referendum on EU membership to take place.
The Times daily political mailout Redbox reports that this date has been earmarked by the British government.
While The Conservative Party's electoral promise committed to having the vote before the end of 2017, Mr Cameron has indicated that he hopes to have a vote sooner rather than later.
He will travel to the European leaders summit in mid-February hoping to have gained support for his four reform requests - this would facilitate a vote during the summer of 2016.
If he cannot secure support when the European Council meet on February 18th then he is unlikely to secure a deal with enough time to hold a vote in June.
As people leave the country to go on holidays in July and August, September is the next likely date for a vote to be held.
If a vote cannot take place in September reduced sunlight means that the British government would be likely to wait until well into 2017.
This could be problematic as the campaign would overlap with elections in Germany and France which could delay the debate on reforms.
Mr Cameron and The Conservatives' reform demands come under four headings: