17 September 2026

• 260th day of the year. There are then 105 days left in 2026.
• 38th Thursday of 2026.
• on the 38th week of 2026 (using ISO standard week number calculation).
• 89th day of Summer. There are 6 days left till Fall.
• Birthstone for this day: Sapphire

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

• Constitution Day - United States
• Australian Citizenship Day - Australia
• Marathwada Liberation Day - India
• Día del Profesor - Argentina