The political parties, commentators, most MPs, staff in the House of Commons and me - all have 5 May 2005 entered into their PDAs as election day.
By Nick Assinder
BBC News Online Political Correspondent
It is not, needless to say, because we have any inside information.
Tony Blair could capitalise on his recent good fortune
Even if Tony Blair has made up his mind, he is keeping it very close to his chest.
It just seems to make sense.
He will have done his four years, which has become the near-traditional time to go to the country - so no accusations of cut and run.
With a bit of luck, a newly-democratic Iraq will have faded entirely from the TV screens, and Britain will be ready to "lead the world" by taking over the chairs of the G8 and the EU.
Delivery on the public services may even be being felt across the nation and, who knows, even the trains might be running on time - actually, just running would do.
It may even be sunny and it is set to be the date of the local elections.
All of this could feed into a much-sought after feelgood factor about the government.
555 it is then.
So imagine the horror when the head of the European Policy Forum thinktank, Graham Mather, suggests a dozen reasons why the prime minister could go to the country on 4 November 2004 - or, to put it another way, 4114.
There is little doubt that the more sensible in the above expectant groups have already prepared themselves for just such an eventuality, if only mentally.
And I have no doubt the political parties have got, or are in the process of getting, their campaigns ready on a "just-in-case" basis.
But really - November. Everyone knows that is a no-no.
Graham Mather's 12 reasons
Major Labour five year plans for policies in health, education
etc are now in place
A vote winning package with the unions has just been agreed at
Labour's Policy Forum
The opposition is unlikely to be weaker in May than in November.
A November election is well clear of any complications arising
from 2005 European constitutional referendums in other countries
Various international issues (Iraq inquiries, European
Commissionership etc) have been settled and are relatively calm
One or more referendums on plans for elected regional assemblies are due to be held on Thursday November 4th and the government likes to combine different polls on the same day
With expectations high for an election in May 2005 the criticism that the government is "cutting and running" by going a little earlier would not stick
Holding an election in 2005 would run into Britain's G8 presidency in the first half of the year and its European Union presidency in the second half
The economic situation in May is unlikely to be better than in November; interest rates may rise, house prices rises may decline and March may see a difficult budget
It is always better to move ahead of the expectations of political commentators to avoid any sense of being "boxed in"
It rains - putting people off from turning out and voting in the first place.
And Labour supporters traditionally are most likely to stay at home in the autumn.
It would, as already noted, suggest the prime minister was cutting and running to capitalise on his recent turn of good fortune which may prove to be fragile.
And, worse of all, that might suggest he knows something about the future development of the economy that we don't.
The last time such an election was called was in October 1974 after Labour's Harold Wilson failed to get a majority government in the first election in the spring of that year.
He got his majority, but only just. Since then autumn has been a non runner.
And there is a danger in the prime minister allowing talk of an autumn election to grow.
The last Labour Prime Minister, Jim Callaghan, did exactly that in 1978 and then delayed it until the following spring for fear of a hung parliament.
He lost to the phenomenon that was Margaret Thatcher.
But read Graham Mather's "12 reasons why Blair may call a November poll" - and it all goes out of the window.
It is a powerful, persuasive case which will certainly cast a bit of a shadow over some people's summer holidays.
But then, maybe I am too easily persuaded.