Kat Chong and David Tran believe they have secured the perfect wedding date.
The couple from the Sydney suburb of Parramatta will tie the knot next Sunday: the 10th day of the 10th month of 2010.
They visited a numerologist who said getting married on October 10 would ensure a happy life together.
"In Chinese culture, numbers can be very important," Mr Tran, 28, said.
Miss Chong, 24, said: "We hadn't realised it was such a big day, and I was so worried I wouldn't be able to get a dress."
Only two other dates this century remain in which the day, month and year will be the same: 11-11-2011 and 12-12-2012.
A spokeswoman for Australian Marriage Celebrants Incorporated, Ann Dally, said there was an unusually high number of weddings booked for next Sunday.
Ms Dally said some celebrants in her organisation had been turning couples away. "A lot of celebrants might only get one wedding a week or one wedding a month but all our members are booked out for this date. I have actually had to turn away about 10 couples."