It will be the highlight of the British calendar whenever it falls.
But even before it is announced, Prince William and Kate Middleton's wedding date seems to be causing problems in royal circles.
Sources have revealed that the 28-year-old royal is in disagreement with his advisers about when the ceremony should take place.
The prince is said to be keen to marry sooner rather than later, and would ideally like to tie the knot in April or May.
However, it has been suggested he look at a later date for the best chance of sunshine.
Aides have argued that a downpour at the wedding – likely to draw the biggest TV audience in history – will only reinforce perceptions of 'rainy England'.
Bookmakers have cut their odds on a date in May from 10/1 to 11/4 overnight.
What is likely is that Britain will enjoy a day off work when the ceremony does take place.
David Cameron has said it would be a "very good idea" to have a bank holiday to mark the marriage, so that the country can enjoy "a day of national celebration".
The date of the ceremony is expected to be announced on Friday.
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