2010: Debut and line-up changeedit

Girl's Day debuted with five members (Jihae, Jisun, Jiin, Sojin, and Minah) on July 7, 2010, with their first song, "Tilt My Head" ("갸우뚱"). Their debut EPGirl's Day Party #1was released two days after. The group followed up promotions for "Tilt My Head" with the song "How About Me" ("나어때"), for which they released a music video on July 21.

On September 12, two months after their debut, Jisun and Jiin left the group to pursue individual interests, and two new members, Yura and Hyeri, were added to the group. The new lineup's digital releaseGirl's Day Party #2became available on October 29 with the lead track "Nothing Lasts Forever" ("잘해줘봐야").

2011:Everydayedit

On March 16, 2011, Girl's Day digitally releasedGirl's Day Party #3with the single "Twinkle Twinkle" ("반짝반짝"). On May 7, the group performed in their first overseas concert,I Love You Taiwan! We are friends(사랑해(莎朗嘿) 台灣! We are friends 演唱會), at the Taipei International Convention Center . The concert was organised by the Korea Tourism Organization and also featured performances by U-KISS and Super Junior M .

On July 6, the group released a second EP titledEveryday. The title track was "Hug Me Once" ("한번만 안아줘").

In September, the group releasedGirls' Day Party #4with the track "Don't Flirt" ("너, 한눈 팔지마!"). The song was written and produced by Gang Jeon-hyong and Nam Ki-san, who also produced previous singles "Twinkle Twinkle" and "Hug Me Once".

2012:Everyday 2and Jihae's departureedit

Girl's Day in 2012

, was released on April 17, 2012.It contained the song "Telepathy", which was written and produced by Sojin, in addition to the title track "Oh! My God".

The remaining four members returned with the song "Don't Forget Me" ("나를 잊지마요") from their fifth digital release,Girl's Day Party #5.

2013:Expectationand rise in popularityedit

At a fan meeting in 2013

This marked the start of a rise in popularity for the group. They also promoted the track "Female President" ("여자대통령"), which was named one of the "20 Best K-pop Songs of 2013" by Billboard.

FollowingExpectation, the group releasedGirl's Day Party #6with "Please Tell Me" and on October 10 the motivational song "Let's Go" ("렛츠 고"), written and composed by Sojin.

2014:Everyday 3,Everyday 4, andI Miss Youedit

Girl's Day in 2014

On January 3, 2014, Girl's Day released their fourth EP,Everyday 3, which was largely produced by Duble Sidekick . The music video for the title track "Something" ("썸씽") reached one million views within a day, and the song became their highest-charting single, peaking at #2 on both Billboard's Korea K-Pop Hot 100 and the Gaon Digital Chart . It also ranked first on the monthly Gaon Digital Chart, and remained in the top 10 of the Korea K-Pop Hot 100 for eight weeks. The group's live promotions for "Something" won five music show awards, and later that year, the song won the 'Best Dance Performance by a Female Group' award at the 2014 Mnet Asian Music Awards .

In July, the group released their fifth EP,Everyday 4, with the lead single "Darling". The EP was again produced by Duble Sidekick.

On November 26, they released the compilation albumBest Albumin Japan.

2015–present:Loveand Japanese debutedit

At the Phoenix Summer Festival in Ilsan in 2015

One Fine Day.

, which contained Japanese versions of the singles "Darling", "Twinkle Twinkle" and "Ring My Bell". The group also held a showcase in Taipei on November 1, performing twelve of their songs to an audience of 2,000 fans.

That month the group visited Chiang Rai , Thailand , where they carried out volunteer work.

Currentedit

• Sojin (소진, born Park So-jin (박소진), 21 May 1986)
• Yura (유라, born Kim Ah-young (김아영), 6 November 1992)
• Minah (민아, born Bang Min-ah (방민아), 13 May 1993)
• Hyeri (혜리, born Lee Hye-ri (이혜리), 9 June 1994)

Formeredit

• Jihae (지해, born Woo Ji-hae (우지해)), left the group in October 2012.
• Jiin (지인, born Lee Ji-in (이지인)), left the group in September 2010. In 2014, she joined the girl group Bebop.

Member timelineedit

Korean albums

• Expectation(2013)
• Love(2015)

Japanese albums

• Girl’s Day 2015 Autumn Party(2015)

Koreaedit

• 2014:Summer Party

Japanedit

• 2012:Girl's Day Party in Zepp
• 2013:Christmas Kiss Fan Meeting
• 2014:Spring Fan Meeting
• 2014:Winter Party
• 2015:Autumn Party
• 2016:You Are My Valentine Fan Meeting

Othersedit

• 2014:Kstar FanFest in Singapore
• 2015:1st Taiwan Showcase

TV shows

Variety Shows

1. "(EP) Everyday Ⅱ / Daum 뮤직 :: 언제 어디서나 Music on Daum" (in Korean). Daum Communications. 
2. "걸스데이, 지해 탈퇴…4인조로 26일 컴백". Nate. October 17, 2012. Retrieved October 17, 2012. 
3. "KBS World Radio K-POP News". world.kbs.co.kr. Retrieved 2016-04-26. 
4. "20 Best K-Pop Songs of 2013: K-Town Picks". Billboard. December 23, 2013. Retrieved January 7, 2015. 
5. "Girl's Day releasing their new album in a smart card format for the first time in the world". sg.celebrity.yahoo.com. Retrieved 2016-04-26. 
6. Lim Jeong-yeo (May 11, 2015). "Girl’s Day with bright new hair colors for ‘Hello Bubble’". K-Pop Herald. Retrieved May 15, 2015. 
7. "Girl's Day travel to Okinawa, Japan for their 'One Fine Day'". Retrieved June 8, 2015. 
8. 최종수정 (June 3, 2015). "걸스데이 7월 6일 컴백! '1년만에 만나요' [Girl's Day will comeback on the 6th of July! 'Let's meet after a year']". Naver. Retrieved June 3, 2015. 
9. "걸스데이(GirlsDay), '최군TV' 방송 태도 논란…'이게 무슨 일?'". 네이트뉴스 (in Korean). Retrieved 2016-01-02. 
10. "걸스데이 소진, 태도논란 공식사과 "불편함 느꼈을 분들께 죄송"". entertain.naver.com. Retrieved 2016-01-02. 
11. "Girl′s Day Brought to Tears by Fans in Taiwan". mwave.interest.me. Retrieved 2016-01-02. 
12. "Girl's Day volunteers for children in Cambodia". Yonhap News Agency. Retrieved 2016-02-17. 
13. "Korean Singers Girl's Day Reveal Photos from Volunteer Work in Chiang Rai". www.chiangraitimes.com. Retrieved 2016-04-26. 
14. "KPOP NEWS - Girl’s Day to Take Volunteer Trip to Thailand | Mwave". mwave.interest.me. Retrieved 2016-04-26. 
15. "Girl's Day volunteers for children in Cambodia". Yonhap News Agency. Retrieved 2016-02-17. 
16. "Hwang Ji-sun's profile on Daum Music under the stage name as JN". Daum Communications. Retrieved October 17, 2012. 
17. "Girl's Day renew their contract with Dream Tea Entertainment until 2019". Allkpop. July 29, 2015. Retrieved July 28, 2015.