Baby Oliver Talmage born at 12:12 on 12/12/12 in Essex
A couple from Essex are celebrating the birth of their baby son who arrived at 12:12 GMT - when the time, date, month and year all matched.
The timing means Oliver Talmage's full date and time of birth will be recorded as 12.12 GMT on 12/12/12.
His mother Hannah MacLennan went into labour at the Princess Alexandra Hospital in Harlow about 06:00.
She said: "He was due on the 18th so it's come as a bit of a surprise. It will give him his 15 minutes of fame."
Miss MacLennan, 34, an admin worker at an investment bank, and her husband Andrew Talmage, 39, who works in car restoration, already have one son, three-year-old Jack.
The couple, from High Ongar, Essex, are expected to return home with Oliver, who weighed 7lb (3.2kg), later.
Ms MacLennan said: "As soon as he was born the midwife came in and pointed out the timing.
"We were already celebrating and this makes it all the more special.
"It's a great little story which we will be telling for years to come."
Ms MacLennan said it was "great to have a brother for Jack" and that she had always wanted two children. The couple are not planning to have any more.
Mr Talmage said: "We're just delighted to have a healthy baby - anything else is just a nice extra."
This is the last day of the century when the date, month and year can match.