17 September 2023

• 260th day of the year. There were then 105 days left in 2023.
• 38th Sunday 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.

• Rosh Hashana (End) - United States, Mexico, United Kingdom, Canada, Australia
• Bettagsmontag - Switzerland
• Feast Day of the Walloon Region (Feiertag der Wallonischen Region) - Belgium
• Federal Fast (Eidgenössische Danktag, Busstag und Bettag) - Switzerland
• Constitution Day - United States
• Australian Citizenship Day - Australia
• Marathwada Liberation Day - India
• Día del Profesor - Argentina
• Terry Fox Day - Canada