17 December 2026

• 351st day of the year. There are then 14 days left in 2026.
• 51st Thursday of 2026.
• on the 51st week of 2026 (using ISO standard week number calculation).
• 86th day of Fall. There are 4 days left till Winter.
• Birthstone for this day: Turquoise & Blue Topaz

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

• Muerte de Simón Bolívar (Venezuela) - Venezuela
• National Maple Syrup Day - Popular in: United States, Canada
• Día Latinoamericano del Ambientalista - Colombia