October 11 — calendar date, observances and notable facts

Calendar details

The counting shown above uses the modern Gregorian calendar. In texts discussing year lengths or leap years you may also see a reference to a leap year, which inserts an extra day into February and shifts the ordinal numbering of dates after February 28.

Observed days and public awareness

Several internationally recognized and grassroots observances fall on October 11. Two widely noted examples are the United Nations' International Day of the Girl Child, created to highlight girls' rights and the challenges they face, and National Coming Out Day, a day of visibility and support for lesbian, gay, bisexual and transgender people that began as an activist event in the late 20th century.

Typical uses and cultural context

Fixed calendar dates such as October 11 are used for anniversaries, commemorations and legal deadlines. Depending on local customs, the same date can host festivals, remembrance services, civic events or school activities tied to seasonal harvests and community schedules.

Notable examples

• Birthdays and anniversaries: public figures and community leaders born on October 11 are often commemorated on this date; for example, Eleanor Roosevelt, a prominent 20th-century political figure and activist, was born on October 11.
• Events: a wide range of historical, scientific and cultural events have occurred on various October 11ths; such lists are commonly compiled in chronologies and reference works.

Distinctions and practical notes

Because some holidays move by weekday (for example, observances tied to the second Monday of October) while others are fixed, October 11 can sometimes coincide with or be distinguished from related celebrations. When using calendar data across eras or countries, it is important to specify the calendar system and whether a year is a leap year to avoid misdating.