Soon-to-be birthday girl Liv Worsnop is among 14,000 Kiwis celebrating their birthdays on September 30 - the most popular birth date in the country

Liv Worsnop shares her birthday with 14,000 other Kiwis.

The Hawke's Bay raised and now Christchurch-based artist turns 25 on September 30 - the most common birth date in the country, according to Statistics New Zealand.

Birth records show the peak birthday period starts on September 19 and runs through till October 1.

iStock More candles than usual are extinguished on September 30 each year - the most popular birth date in New Zealand

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Over the 13-day period, the 10 most popular birthdays will occur, with about 180,000 New Zealanders expected to celebrate, senior demographer Kim Dunstan said.

The most common birthday in New Zealand is September 30, with 14,000 Kiwis blowing out the candles that day.

The least common birthdays tend to be centred around public holidays, with the periods between December 24-27, January 1 and 2, and Anzac Day on April 25 lowest on the list.

The least common day in a normal calendar year is December 25, although February 29 unsurprisingly snatches the title for the most unlikely day of birth.

"Although the peak birthday period in New Zealand is similar to that in the United States, the pattern is less extreme across the Tasman and in the UK," Dunstan said.

Worsnop's biggest issue with being born amid the most popular birthday period for New Zealanders, was that her milestone invariably fell during the school holidays when she was growing up.

The term structure during her schooling meant her birthday fell when many of her classmates were away.

"I never got to have a birthday at school, which was awful. When you had a birthday during the term there were parties."

She did get a sense of what it was like to be conceived early in a new year, however, because one of her teachers would always hold a combined birthday for the pupils who would be holidaying on their big day.

A welcome gesture, though the combined arrangement meant it wasn't held on their actual birthday.

"If your birthday was in the holidays you had to share your party. That wasn't very cool, i didn't enjoy that."

Worsnop, did have a separate birthday to her father Jeff though, who was born on September 29.

"We never had a combined party though it is quite special our birthdays are close," she said.

Her younger sister Sophie was born on October 6, just outside the peak period, and is due to celebrate her 21st.

Although part of a birthday logjam, Worsnop liked the idea of being conceived at the start of the 1990s and said a September birthday was preferable to being born on Christmas Day, at New Year or February 29 during a leap year.

The Statistics NZ 'rank your birthday' tool, which you can use in this story, shows how common a birth date is, and how many people share the day.

Most common birthdays

1. September 30

2. September 26

3. September 28

4. September 27

5. September 29

6. October 1

7. September 24

8. September 22

9. September 19

10. September 25

Least common birthdays

1. February 29

2. December 25

3. December 26

4. January 1

5. January 2

6. April 25

7. February 6

8. December 24

9. December 27

10. April 1