What is former SISTAR member Bora's real birth date?

Netizens are asking ''Did Bora lie about her birth date?'' after seeing her latest profile update. 

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When netizens searched for the former SISTAR member's name on popular portal site Naver, they've noticed that her birthday has changed. 

When she was under Starship Entertainment, her birthday was listed as January 30, 1990.

However, it has now changed to December 30, 1989. The change occurred soon after the news of her contract with Hook Entertainment. 

Netizens confused by the sudden change asked, "Why did it change all of the sudden?", "Did she lie?"

Bora has always introduced herself as a fast 90; meaning she was born in the earlier months of the year 1990. Bora appeared on KBS 2TV's 'Challenge! Golden Ladder' before her debut and introduced herself as a class of '09 musical major at Myongji University. If she was born in 1989 and enrolled in college right after graduating high school, she would've been in the class of '08. She would have been in the class of '09 if she was born in the year 1990. However, she's close friends with Girls' Generation's Hyoyeon, Tiffany, and Taeyeon, who were all born in 1989. It's revealed that they just decided to be friends even though Bora is technically a year younger since Bora has an early birthday. 

Is appears the birthday change could just be a mistake that was made by whoever is in charge of her Naver profile.