31day

31day is a term used in online communities to denote a month-long period of daily activity or a campaign centered on completing a task for each of the 31 days of a calendar month. It is not a single official program but a branding convention applied to a variety of challenges and projects. The format is widely used across domains such as writing, art, fitness, personal development, education, and productivity.

Common formats include a 31-day challenge or a series of daily prompts or micro-tasks designed to build a habit, develop a skill, or produce regular work. Participants typically share progress or finished pieces on social media, blogs, or dedicated forums, often using a consistent tag, journal entry, or gallery format to encourage accountability and community support.

The 31day concept is flexible and adapted to different goals. It can involve creating daily content, completing small exercises, practicing a discipline, or tracking progress in a personal project. Platforms that host or promote such challenges include blogs, social networks, and creative communities, where organizers provide prompts or themes for each day.

Historically, the idea predates digital media but gained popularity with online sharing and community challenges during the 2000s and 2010s. In practice, 31day parallels other month-long formats such as Inktober (an art-focused 31-day October prompt series) and other “month-long” creative or habit-forming initiatives. See also 31-day challenges and month-long creative prompts.