October 21, 2025

• 294th day of the year. There are then 71 days left in 2025.
• 42nd Tuesday of 2025.
• on the 43rd week of 2025 (using US standard week number calculation).
• 30th day of Fall. There are 61 days left till Winter.
• Birthstone for this day: Opal and Tourmaline

There are no major holidays or observances in the United States for this date.

• Diwali/Deepavali - Singapore
• World War II Victims Remembrance Day (Дан сећања на српске жртве у Другом светском рату) - Popular in: Serbia
• Apple Day - United Kingdom
• Police Commemoration Day - India