Lucky Seven 07-07-07. Or will these flim flam nuptials defy the 'Seven Year Itch.

I do hope I am proven wrong, but a bunch of nuts marrying for all the wrong reasons is what I perceive here.

SEVEN-tier cakes, 7pm receptions, seven types of flowers - for couples who plan to marry on 07/07/07, that is the number.

Wedding celebrants will today experience one of the busiest days in the industry's history, with thousands choosing the special date to exchange vows.

In Sydney, the NSW Registry of Births, Deaths and Marriages has extended its opening hours to cope with demand for the date as 24 couples will be married there, the first service at 9am and the last to finish after 8pm.

NSW Registry of Births, Deaths and Marriages registrar Greg Curry said the date had caused a "sensation" with couples looking to kick-start their marriages.

For Jeff Chen, 25, and 24-year-old Angela Feng, to be married during the registry's all-important 7pm timeslot, the date and time were simply a happy accident.

"It's not a special date for us . . . it's coincidence that we're getting married at 7pm," Mr Chen said. "They'd extended the opening hours and that time was the first available slot so we said, 'Oh, all right then – that's when we'll get married'.

"My fiancee is pregnant so we just wanted to do it quickly. Our parents will be there and we're having a dinner afterwards."

Why 07/07/07 is considered a lucky date:

 According to Christian doctrine, God created the world and rested on the seventh day

 For gamblers, 777 is the top slot-machine jackpot; the digits add up to 21 for blackjack; and in craps a roll that adds up to 7 wins

 Christians celebrate seven sacraments and seven virtues. Native Americans honour seven directions. Hindus recognise seven chakras, or energy centres in the body

 The seventh day falls on Saturday for Jews and Seventh Day Adventists

 There are seven wonders of the world

The list of lucky sevens is inexhaustible, but after taking seven years to knock out seven children, Comes the SEVEN YEAR ITCH, or in Hollywood the 'Two Year Scratch'.