11 September 2023

• 254th day of the year. There were then 111 days left in 2023.
• 37th Monday of 2023.
• on the 37th week of 2023 (using ISO standard week number calculation).
• Birthstone for this day: Sapphire

There are no major holidays or observances in New Zealand for this date.

• Cataluña Day (Día de Cataluña) - Spain
• Birthday of Queen Paola (Verjaardag van Koningin Paola) - Belgium
• Virgen de Coromoto - Venezuela
• Patriot Day - United States
• Día del Maestro (Argentina) - Argentina
• Zürich Target Shooting Festival ends (Knabenschiessen Montag) - Switzerland
• Parliamentary Election Day (Stortingsvalg-dagen) - Norway