17 August 2023

• 229th day of the year. There are then 136 days left in 2023.
• 33rd Thursday of 2023.
• on the 33rd week of 2023 (using ISO standard week number calculation).
• Birthstone for this day: Peridot

There are no major holidays or observances in South Africa for this date.

• Aniversario del General José de San Martín - Argentina
• Black Cat Appreciation Day - Popular in: United States, United Kingdom, Canada
• Día del Ingeniero (Colombia) - Colombia
• Día de la Bandera - Bolivia
• Slovsles in Prekmurje Incorporated into the Mother Nation (Slovšle v Prekmurju, Ki So Vključene v Materino Narodnost) - Slovenia
• Sour Herring festival (Surströmmingspremiär) - Sweden
• Indonesia Independence Day - Popular in: Australia
• National Nonprofit Day - United States