June 30 National Days

June 30 is the 181st day of the year (182nd in leap years) in the Gregorian calendar, leaving 184 days until the end of the year. Today’s observances range from celestial events and classic cars to anime fandom, global democracy, and social media culture.

National Days on June 30th — June 30th National Days

Most of today’s celebrations fall on a fixed date, while one—Please Take My Children to Work Day—is tied to the last Monday in June. Together, they reflect a wide mix of global issues, internet trends, scientific awareness, and pop culture.

Here’s a full overview of the 9 national and international days observed on June 30.

National and International Days on June 30

International Asteroid Day: Officially recognized by the United Nations in 2016, this day raises awareness about asteroid risks and planetary defense strategies. It commemorates the Tunguska event, a massive explosion in Siberia on June 30, 1908, believed to have been caused by an asteroid. The day was co-founded by astrophysicist Dr. Brian May, Apollo 9 astronaut Rusty Schweickart, filmmaker Grig Richters, and Danica Remy of the B612 Foundation.

International Day of Parliamentarism: This UN-designated day celebrates the role of parliaments in promoting democracy, representation, and accountability. It marks the anniversary of the Inter-Parliamentary Union (IPU), founded on June 30, 1889. The IPU now includes 179 member parliaments and advocates for political inclusion under the slogan “For democracy. For everyone.”

⚖️ A similar day, International Day of Democracy, is observed annually on September 15th.

International Sailor Moon Day: Launched in 2015 by Lisa Terlato, this fan-based celebration honors the globally loved manga and anime character Usagi Tsukino—also known as Sailor Moon—on her fictional birthday. Originally published in 1991, Sailor Moon has sold over 35 million copies in 50 countries and remains a cultural icon worldwide.

Leap Second Time Adjustment Day: Occasionally observed on either June 30 or December 31, this day marks the rare addition of a leap second to atomic clocks to keep Earth’s time aligned with its irregular rotation. Though not added every year, it serves as a reminder of the complexities behind global timekeeping.

National Corvette Day: In 2008, the U.S. House of Representatives officially designated June 30 as National Corvette Day to commemorate the date the first Corvette rolled off the assembly line in 1953. The day celebrates the enduring legacy of America’s iconic sports car and the passionate community of Corvette owners.

National Meteor Watch Day: This day invites everyone to look up and search the night sky for meteors—also known as shooting stars. Most meteors are the size of a pebble but create bright streaks as they burn through Earth’s atmosphere. The day encourages stargazing and reminds us of the wonders of the universe.

National OOTD Day (Outfit of the Day): Established in 2018 in honor of TV personality Stassi Schroeder, this celebration embraces personal style and confidence. It encourages people to share their daily outfits on social media as a form of self-expression. The day blends fashion with digital culture in a fun and empowering way.

Please Take My Children to Work Day* (Last Monday in June): Created by Jen Singer of MommaSaid.net in 2003, this tongue-in-cheek holiday supports stay-at-home parents—especially moms—by encouraging others to give them a break for the day. The idea playfully promotes appreciation for unpaid caregiving labor and the need for rest and support.

Social Media Day: Founded in 2010 by Mashable, this day recognizes the profound impact social media has had on communication, culture, and connectivity. From Friendster and MySpace to Facebook, X (formerly Twitter), TikTok, and Instagram, social media has changed how people share ideas, build communities, and influence trends.

🗣️ Just in case you are thinking about taking a break from social media, you can download this free social media detox challenge to help you track your progress.