21 December 2027

• 355th day of the year. There are then 10 days left in 2027.
• 51st Tuesday of 2027.
• on the 51st week of 2027 (using ISO standard week number calculation).
• 1st day of Winter. There are 90 days left till Spring.
• Birthstone for this day: Turquoise & Blue Topaz

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

• Inicio del Verano - Popular in:
  CountryBoliviaBrazil / BrasilChileEcuadorParaguayPeruUruguay
• Inicio del Invierno - See in: Venezuela, United States, Mexico, Spain, Colombia
• Gravy Day - Australia